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19-0451; Rev 1; 10/98
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
General Description
The MAX349/MAX350 are 8-channel and dual 4-channel serially controlled multiplexers (muxes). These muxes conduct equally well in either direction. On-resistance (100 max) is matched between switches to 16 max and is flat (10 max) over the specified signal range. These CMOS devices can operate continuously with dual power supplies ranging from 2.7V to 8V or a single supply between +2.7V and +16V. Each mux can handle rail-to-rail analog signals. The off-leakage current is only 0.1nA at +25C or 5nA at +85C. Upon power-up, all switches are off and the internal shift registers are reset to zero. The serial interface is compatible with SPITM/QSPITM and MICROWIRETM. Functioning as a shift register, it allows data (at DIN) to be clocked in synchronously with the rising edge of clock (SCLK). The shift register's output (DOUT) enables several MAX349s or MAX350s to be daisy chained. All digital inputs have 0.8V or 2.4V logic thresholds, ensuring both TTL and CMOS-logic compatibility when using 5V supplies or a single +5V supply.
____________________________Features
o SPI/QSPI, MICROWIRE-Compatible Serial Interface o 8 Separately Controlled SPST Switches o Single 8-to-1 Mux (MAX349) Dual 4-to-1 Mux (MAX350) o 100 Signal Paths with 5V Supplies o Rail-to-Rail(R) Signal Handling o Asynchronous RESET Input o 2.7V to 8V Dual Supplies +2.7V to +16V Single Supply o >2kV ESD Protection per Method 3015.7 o TTL/CMOS-Compatible Inputs (with +5V or 5V Supplies)
MAX349/MAX350
Ordering Information
PART MAX349CPN MAX349CWN MAX349CAP MAX349C/D TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 18 Plastic DIP 18 Wide SO 20 SSOP Dice*
________________________Applications
Serial Data-Acquisition Systems Avionics Audio Signal Routing Industrial and ProcessControl Systems ATE Equipment Networking
Ordering Information continued at end of data sheet. *Contact factory for dice specifications.
Pin Configurations/Functional Diagrams
TOP VIEW
SCLK 1 V+ 2 DIN 3 GND 4 COM 5 NO0 6 NO1 7 NO2 8 NO3 9 LOGIC
MAX349
18 CS 17 RESET 16 DOUT 15 V14 N.C. 13 NO7 12 NO6 11 NO5 10 NO4
SCLK 1 V+ 2 DIN 3 GND 4 COMA 5 NO0A 6 NO1A 7 NO2A 8 NO3A 9
MAX350
18 CS 17 RESET
LOGIC
16 DOUT 15 V14 COMB 13 NO0B 12 NO1B 11 NO2B 10 NO3B
N.C. = NOT INTERNALLY CONNECTED
DIP/SO
DIP/SO
Pin Configurations continued at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND V+ ...........................................................................-0.3V, +17V V- ............................................................................-17V, +0.3V V+ to V-...................................................................-0.3V, +17V SCLK, CS, DIN, DOUT, RESET .................-0.3V to (V+ + 0.3V) NO, COM .................................................(V- - 2V) to (V+ + 2V) Continuous Current into Any Terminal..............................30mA Peak Current, NO or COM (pulsed at 1ms, 10% duty cycle).................................100mA Continuous Power Dissipation (TA = +70C) 18-Pin Plastic DIP (derate 11.11mW/C above +70C) ..889mW 18-Pin SO (derate 9.52mW/C above +70C)...............762mW 20-Pin SSOP (derate 8.00mW/C above +70C) ..........640mW 18-Pin CERDIP (derate 10.53mW/C above +70C).....842mW Operating Temperature Ranges MAX349C_ _, MAX350C_ _ .................................0C to +70C MAX349E_ _, MAX350E_ _ ...............................-40C to +85C MAX349M_ _, MAX350M_ _ ...........................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS--Dual Supplies
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER ANALOG SWITCH Analog Signal Range COM-NO On-Resistance COM-NO On-Resistance Match Between Channels (Note 2) COM-NO On-Resistance Flatness (Note 2) VCOM, VNO RON RON RFLAT(ON) V+ = 5V, V- = -5V, VCOM = 3V, INO = 1mA V+ = 5V, V- = -5V, VCOM = 3V, INO = 1mA V+ = 5V, V- = -5V, INO = 1mA, VCOM = -3V, 0V, 3V V+ = 5.5V, V- = -5.5V, VCOM = -4.5V, VNO = 4.5V NO Off-Leakage Current (Note 3) INO(OFF) V+ = 5.5V, V- = -5.5V, VCOM = 4.5V, VNO = -4.5V C, E, M TA = +25C C, E, M TA = +25C C, E, M TA = +25C C, E, M TA = +25C C, E M TA = +25C C, E M TA = +25C V+ = 5.5V, V- = -5.5V, VCOM = 4.5V, VNO = 4.5V COM Off-Leakage Current (Note 3) ICOM(OFF) V+ = 5.5V, V- = -5.5V, VCOM = -4.5V, VNO = 4.5V MAX349 MAX349 C, E M TA = +25C MAX350 C, E M TA = +25C C, E M TA = +25C MAX350 C, E M 2 -0.1 -5 -10 -0.1 -5 -10 -0.1 -10 -100 -0.1 -5 -50 -0.2 -10 -100 -0.2 -5 -50 0.002 0.002 0.002 0.002 0.002 0.002 V60 V+ 100 125 16 20 10 15 0.1 5 10 0.1 5 10 0.1 10 100 0.1 5 50 0.2 10 100 0.2 5 50 nA nA V SYMBOL CONDITIONS MIN TYP (Note 1) MAX UNITS
_______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS TA = +25C C, E M TA = +25C C, E M MIN -0.2 -10 -100 -0.2 -5 -50 TYP (Note 1) 0.001 MAX 0.2 10 100 0.2 5 50 UNITS
MAX349/MAX350
COM On-Leakage Current (Note 3)
ICOM(ON)
V+ = 5.5V, V- = -5.5V, VCOM = VNO = 4.5V
MAX349
0.02
nA
MAX350
DIGITAL I/O DIN, SCLK, CS, RESET Input Voltage Logic Threshold High DIN, SCLK, CS, RESET Input Voltage Logic Threshold Low DIN, SCLK, CS, RESET Input Current Logic High or Low VIH VIL IIH, IIL VDIN, VSCLK, V CS = 0.8V or 2.4V IDOUT = 0.8mA IDOUT = -1.6mA C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C C, E, M TA = +25C C, E, M TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C C, E, M TA = +25C C, E, M TA = +25C C, E, M 3 7 -1 -2 0.1 -1 2.8 0 100 200 90 5 40 1 2 2 8 > 90 < -90 275 400 150 300 10 0.03 2.4 0.8 1 V+ 0.4 V V A V V mV
DOUT Output Voltage Logic High VDOUT DOUT Output Voltage Logic Low VDOUT SCLK Input Hysteresis SCLKHYST SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Delay Charge Injection (Note 4) NO Off-Capacitance COM Off-Capacitance Switch On-Capacitance Off-Isolation Channel-to-Channel Crosstalk POWER SUPPLY Power-Supply Range V+ Supply Current V- Supply Current tON tOFF tBBM VCTE CNO(OFF) CCOM(OFF) C(ON) VISO VCT V+, VI+ I-
From rising edge of CS From rising edge of CS From rising edge of CS CL = 1nF, VNO = 0V, RS = 0 VNO = GND, f = 1MHz VCOM = GND, f = 1MHz VCOM = VNO = GND, f = 1MHz RL = 50, CL = 15pF, VNO = 1VRMS, f = 100kHz RL = 50, CL = 15pF, VNO = 1VRMS, f = 100kHz
ns ns ns pC pF pF pF dB dB
DIN = CS = SCLK = 0V or V+, RESET = 0V or V+ DIN = CS = SCLK = 0V or V+, RESET = 0V or V+
8 20 30 1 2
V A A
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3
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
TIMING CHARACTERISTICS--Dual Supplies (Figure 1)
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SERIAL DIGITAL INTERFACE SCLK Frequency Cycle Time CS Lead Time CS Lag Time SCLK High Time SCLK Low Time Minimum Data Setup Time Data Hold Time DIN Data Valid after Falling SCLK (Note 4) Rise Time of DOUT (Note 4) Allowable Rise Time at DIN, SCLK (Note 4) Fall Time of DOUT (Note 4) Allowable Fall Time at DIN, SCLK (Note 4) RESET Minimum Pulse Width SYMBOL CONDITIONS MIN TYP MAX (Note 1) 2.1 UNITS
fSCLK tCH + tCL tCSS tCSH2 tCH tCL tDS tDH tDO tDR tSCR tDF tSCF tRW 50% of SCLK to 10% of DOUT, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF
C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C
0 480 240 240 190 190 0 17 -17 85
MHz ns ns ns ns ns ns ns ns ns s ns s ns
100
400 100 2 100 2 70
Note 1: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Note 2: RON = RON(max) - RON(min). On-resistance match between channels and on-resistance flatness are guaranteed only with specified voltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 3: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp. Note 4: Guaranteed by design. Note 5: Leakage testing at single supply is guaranteed by testing with dual supplies. Note 6: See Figure 6. Off-isolation = 20log10 VCOM/VNO, VCOM = output. NO = input to off switch. Note 7: Between any two switches. See Figure 3.
4
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Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
ELECTRICAL CHARACTERISTICS--Single +5V Supply
(V+ = +4.5V to +5.5V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER ANALOG SWITCH Analog Signal Range COM-NO On-Resistance VCOM, VNO RON V+ = 5V, VCOM = 3.5V, INO = 1mA V+ = 5.5V, VCOM = 4.5V, VNO = 0V NO Off-Leakage Current (Notes 4, 5) INO(OFF) V+ = 5.5V, VCOM = 0V, VNO = 4.5V C, E, M TA = +25C C, E, M TA = +25C C, E M TA = +25C C, E M TA = +25C MAX349 V+ = 5.5V, VCOM = 4.5V, VNO = 0V MAX350 COM Off-Leakage Current (Notes 4, 5) ICOM(OFF) MAX349 V+ = 5.5V, VCOM = 0V, VNO = 4.5V MAX350 C, E M TA = +25C C, E M TA = +25C C, E M TA = +25C C, E M TA = +25C MAX349 COM On-Leakage Current (Notes 4, 5) ICOM(ON) V+ = 5.5V, VCOM = VNO = 4.5V MAX350 DIGITAL I/O DIN, SCLK, CS, RESET Input Voltage Logic Threshold High DIN, SCLK, CS, RESET Input Voltage Logic Threshold Low DIN, SCLK, CS, RESET Input Current Logic High or Low DOUT Output Voltage Logic High DOUT Output Voltage Logic Low SCLK Input Hysteresis POWER SUPPLY V+ Supply Current I+ DIN = CS = SCLK = 0V or V+, TA = +25C RESET = 0V or V+ C, E, M 7 20 30 A 5 VIH VIL IIH, IIL VDOUT VDOUT SCLKHYST VDIN, VSCLK, V CS = 0.8V or 2.4V IDOUT = 0.8mA IDOUT = -1.6mA C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M -1 2.8 0 100 0.03 2.4 0.8 1 V+ 0.4 V V A V V mV C, E M TA = +25C C, E M -0.1 -5 -10 -0.1 -5 -10 -0.1 -10 -100 -0.1 -5 -50 -0.2 -10 -100 -0.2 -5 -50 -0.2 -10 -100 -0.2 -5 -50 0.02 0.01 0.002 0.002 0.002 0.002 0.002 0.002 V125 V+ 175 225 0.1 5 10 0.1 5 10 0.1 10 100 0.1 5 50 0.2 10 100 0.2 5 50 0.2 10 100 0.2 5 50 nA nA nA V SYMBOL CONDITIONS MIN TYP (Note 1) MAX UNITS
MAX349/MAX350
_______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = +4.5V to +5.5V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP (Note 1) 160 60 15 1 > 90 < -90 MAX UNITS
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Delay Charge Injection (Note 4) Off-Isolation (Note 6) Channel-to-Channel Crosstalk (Note 7) tON tOFF tBBM VCTE VISO VCT From rising edge of CS From rising edge of CS From rising edge of CS CL = 1nF, VNO = 0V, RS = 0 RL = 50, CL = 15pF, VNO = 1VRMS, f = 100kHz RL = 50, CL = 15pF, VNO = 1VRMS, f = 100kHz TA = +25C C, E, M TA = +25C C, E, M TA = +25C TA = +25C TA = +25C TA = +25C 400 500 200 300 10 ns ns ns pC dB dB
6
_______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
TIMING CHARACTERISTICS--Single +5V Supply (Figure 1)
(V+ = +4.5V to +5.5V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SERIAL DIGITAL INTERFACE SCLK Frequency Cycle Time (Note 4) CS Lead Time (Note 4) CS Lag Time (Note 4) SCLK High Time (Note 4) SCLK Low Time (Note 4) Minimum Data Setup Time (Note 4) Data Hold Time (Note 4) DIN Data Valid after Falling SCLK (Note 4) Rise Time of DOUT (Note 4) Allowable Rise Time at DIN, SCLK (Note 4) Fall Time of DOUT (Note 4) Allowable Fall Time at DIN, SCLK (Note 4) RESET Minimum Pulse Width SYMBOL CONDITIONS MIN TYP (Note 1) MAX UNITS
MAX349/MAX350
fSCLK tCH + tCL tCSS tCSH2 tCH tCL tDS tDH tDO tDR tSCR tDF tSCF tRW 50% of SCLK to 10% of DOUT, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF
C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C
0 480 240 240 190 190 17 -17 85
2.1
MHz ns ns ns ns ns
100
ns ns
400 100 2 100 2 70
ns ns s ns s ns
Note 1: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Note 2: RON = RON(max) - RON(min). On-resistance match between channels and on-resistance flatness are guaranteed only with specified voltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 3: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp. Note 4: Guaranteed by design. Note 5: Leakage testing at single supply is guaranteed by testing with dual supplies. Note 6: See Figure 6. Off-isolation = 20log10 VCOM/VNO, VCOM = output. NO = input to off switch. Note 7: Between any two switches. See Figure 3.
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7
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = +3.0V to +3.6V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER ANALOG SWITCH Analog Signal Range COM-NO On-Resistance VCOM, VNO RON V+ = 3.0V, VCOM = 1.5V, INO = 1mA MAX349 V+ = 3.6V, VCOM = 3V, VNO = 0V MAX350 COM Off-Leakage Current (Notes 4, 5) ICOM(OFF) MAX349 V+ = 3.6V, VCOM = 0V, VNO = 3V MAX350 C, E, M TA = +25C C, E, M TA = +25C C, E M TA = +25C C, E M TA = +25C C, E M TA = +25C C, E M TA = +25C MAX349 COM On-Leakage Current (Notes 4, 5) ICOM(ON) V+ = 3.6V, VCOM = VNO = 3V MAX350 DIGITAL I/O DIN, SCLK, CS, RESET Input Voltage Logic Threshold High DIN, SCLK, CS, RESET Input Voltage Logic Threshold Low DIN, SCLK, CS, RESET Input Current Logic High or Low DOUT Output Voltage Logic High DOUT Output Voltage Logic Low SCLK Input Hysteresis POWER SUPPLY V+ Supply Current I+ DIN = CS = SCLK = 0V or V+, TA = +25C RESET = 0V or 5V C, E, M 6 20 30 V A VIH VIL IIH, IIL VDOUT VDOUT SCLKHYST VDIN, VSCLK, V CS = 0.8V or 2.4V IDOUT = 0.1mA IDOUT = -1.6mA C, E C, E C, E C, E, M C, E, M C, E, M -1 2.8 0 100 0.03 2.4 0.8 1 V+ 0.4 V V A V V mV C, E M TA = +25C C, E M -0.1 -10 -100 -0.1 -5 -50 -0.2 -10 -100 -0.2 -5 -50 -0.2 -10 -100 -0.2 -5 -50 0.02 0.01 0.002 0.002 0.002 0.002 V270 V+ 500 600 0.1 10 100 0.1 5 50 0.2 10 100 0.2 5 50 0.2 10 100 0.2 5 50 nA nA V SYMBOL CONDITIONS MIN TYP (Note 1) MAX UNITS
8
_______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
ELECTRICAL CHARACTERISTICS--Single +3V Supply (continued)
(V+ = +3.0V to +3.6V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP (Note 1) 275 120 5 15 1 > 90 < -90 MAX UNITS
MAX349/MAX350
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time (Note 4) Turn-Off Time (Note 4) Break-Before-Make Delay (Note 4) Charge Injection (Note 4) Off-Isolation (Note 6) Channel-to-Channel Crosstalk (Note 7) tON tOFF tBBM VCTE VISO VCT From rising edge of CS From rising edge of CS From rising edge of CS CL = 1nF, VNO = 0V, RS = 0 RL = 50, CL = 15pF, VNO = 1VRMS, f = 100kHz RL = 50, CL = 15pF, VNO = 1VRMS, f = 100kHz TA = +25C C, E, M TA = +25C C, E, M TA = +25C TA = +25C TA = +25C TA = +25C 600 700 300 400 10 ns ns ns pC dB dB
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9
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
TIMING CHARACTERISTICS--Single +3V Supply (Figure 1)
(V+ = +3.0V to +3.6V, V- = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SERIAL DIGITAL INTERFACE SCLK Frequency Cycle Time (Note 4) CS Lead Time (Note 4) CS Lag Time (Note 4) SCLK High Time (Note 4) SCLK Low Time (Note 4) Minimum Data Setup Time (Note 4) Data Hold Time (Note 4) DIN Data Valid after Falling SCLK (Note 4) Rise Time of DOUT (Note 4) Allowable Rise Time at DIN, SCLK (Note 4) Fall Time of DOUT (Note 4) Allowable Fall Time at DIN, SCLK (Note 4) RESET Minimum Pulse Width (Note 4) SYMBOL CONDITIONS MIN TYP (Note 1) MAX UNITS
fSCLK tCH + tCL tCSS tCSH2 tCH tCL tDS tDH tDO tDR tSCR tDF tSCF tRW 50% of SCLK to 10% of DOUT, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF 20% of V+ to 70% of V+, CL = 10pF
C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C C, E, M C, E, M C, E, M C, E, M C, E, M TA = +25C
0 480 240 240 190 190 38 -38 150
2.1
MHz ns ns ns ns ns
120
ns ns
400 100 2 100 2 105
ns ns s ns s ns
Note 1: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Note 2: RON = RON(max) - RON(min). On-resistance match between channels and on-resistance flatness are guaranteed only with specified voltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 3: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp. Note 4: Guaranteed by design. Note 5: Leakage testing at single supply is guaranteed by testing with dual supplies. Note 6: See Figure 6. Off-isolation = 20log10 VCOM/VNO, VCOM = output. NO = input to off switch. Note 7: Between any two switches. See Figure 3.
10
______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
__________________________________________Typical Operating Characteristics
(V+ = +5V, V- = -5V, GND = 0V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX349/350-TOC1
MAX349/MAX350
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
MAX349/350-TOC2
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
V+ = 2.5V 350 300 RON () V- = 0V
MAX349/350-TOC3
140 120 100 V = 3V RON () V = 2.5V
110 V = 5.5V 100 90 RON () 80 70 60 50 40 TA = -55C TA = +125C TA = +85C TA = +25C
400
250 200 V+ = 3V 150 100 50 0 V+ = 5V V+ = 9V V+ = 12V 0 2 4 6 VCOM (V) 8 10 12
80 60 V = 5V 40 20 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V)
30 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V)
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
MAX349/350-TOC4
OFF-LEAKAGE vs. TEMPERATURE
MAX349/350-TOC5
ON-LEAKAGE vs. TEMPERATURE
V = 5.5V 1,000 ON-LEAKAGE (pA)
MAX349/350-TOC6
180 160 140 RON () 120 100 80 60 40 0 1 2 VCOM (V) 3 4 5 TA = +25C TA = -55C V+ = 5V V- = 0V TA = +125C TA = +85C
1,000 V = 5.5V 100 OFF-LEAKAGE (pA)
10,000
100
10
10 1
1
0.1 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125
0.1 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125
CHARGE INJECTION vs. VCOM
MAX349/350-TOC7
TURN-ON/TURN-OFF TIMES vs. VCOM
MAX349/350-TOC8
DATA HOLD TIME vs. POWER-SUPPLY VOLTAGE
40 30 DATA HOLD TIME (ns) 20 10 0 -10 -20 -30 -40
MAX349/350-TOC9
5 4 3 2 VCTE (pC) 1 0 -1 -2 -3 -4 -5 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V) B A A: V+ = 5V, V- = -5V B: V+ = 5V, V- = 0V
250
A: V+ = 5V, V- = 5V B: V+ = 5V, V- = 0V
50
200 tON, tOFF (ns)
150 A = tON A = tOFF 50 B = tON B = tOFF
100
0 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V)
-50 0 2 4 SUPPLY VOLTAGE (V) 6 8
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11
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, GND = 0V, TA = +25C, unless otherwise noted.)
DATA SETUP TIME vs. POSITIVE SUPPLY VOLTAGE
MAX349/350-TOC10
POWER-SUPPLY CURRENT vs. TEMPERATURE
MAX349/350-TOC11
MINIMUM SCLK PULSE WIDTH vs. POSITIVE SUPPLY VOLTAGE
MAX349/350-TOC12
100 90 80 DATA SETUP TIME (ns) 70
100 V = 5.5V 10 I+
35
30
I+, I-, (A)
50 40 30 20 10 0 0 2 4 SUPPLY VOLTAGE (V) 6 8
0.1 I-
SCLK (ns) -50 -25 0 25 50 75 100 125
60
1
25
20
0.01
15
0.001 TEMPERATURE (C)
10 0 2 4 SUPPLY VOLTAGE (V) 6 8
FREQUENCY RESPONSE
0 -20 LOSS (dB) -40 -60 -80 -100 10k V = 5V 50W IN AND OUT PHASE ISOLATION OF A BARE SOCKET OFF ISOLATION INSERTION LOSS
TOC13
TOTAL HARMONIC DISTORTION vs. FREQUENCY
V = 5V 600 IN AND OUT
MAX349/350-TOC14
20 0 PHASE (DEGREES) -20 -40 -60 -80 -100 -120
100
MAX349/350
10 TDH (%)
1
0.1
0.01 10 100 1k FREQUENCY (Hz) 10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
12
______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
Pin Description
PIN MAX349 DIP/SO SSOP 1 1 2 2 3 3 4 5 6-13 -- -- -- -- 14 15 16 17 18 4 5 6-9, 11-14 -- -- -- -- 10, 15, 16 17 18 19 20 MAX350 DIP/SO SSOP 1 1 2 2 3 3 4 -- -- 5 6-9 10-13 14 -- 15 16 17 18 4 -- -- 5 6-9 11-14 15 10, 16 17 18 19 20 NAME SCLK V+ DIN GND COM NO0-NO7 COMA NO0A-NO3A NO3B-NO0B COMB N.C. VDOUT RESET CS FUNCTION Serial Clock Digital Input Positive Analog Supply Voltage Input Serial Data Digital Input Ground. Connect to digital ground. (Analog signals have no ground reference; they are limited to V+ and V-.) Common Analog Switch (mux output) Normally Open Analog Switch Inputs 0-7 Common Analog Switch "A" (mux output) Normally Open Analog Switch "A" Inputs 0-3 Normally Open Analog Switch "B" Inputs 0-3 Common Analog Switch "B" (mux output) No Connect, not internally connected. Negative Analog Supply Voltage Input. Connect to GND for single-supply operation. Serial Data Digital Output. Output high is V+. RESET Input. Connect to logic high (or V+) for normal operation. Drive low to set all switches off and set internal shift registers to 0. Chip-Select Digital Input (Figure 1)
MAX349/MAX350
Note: NO and COM pins are identical and interchangeable. Either may be considered as an input or an output; signals pass equally well in either direction.
CS tCSS SCLK tCH
***
tCSH2 tON, tOFF
***
tDS tDH DIN tDO DOUT
tCL
***
*** ***
COM-OUT
***
Figure 1. Timing Diagram
______________________________________________________________________________________ 13
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
Detailed Description
Basic Operation
The MAX349/MAX350 are 8-channel and dual 4-channel, serially controlled multiplexers (muxes). These muxes are unusual in that any, all, or none of the input channels can be directed to the output. All switches are bidirectional, so inputs and outputs are interchangeable. When multiple inputs are connected to an output, they are also connected to one another, separated from each other only by the on-resistance of two switches. Both parts require eight bits of serial data to set all eight switches. and a stream of data is shifted through the MAX349s or MAX350s in series. When CS is brought high, all switches are updated simultaneously. Additional shift registers may be included anywhere in series with the MAX349/MAX350 data chain. Note that the DOUT high level is V+, which may not be compatible with TTL/CMOS devices if V+ differs from the logic supply for these other devices.
Addressable Serial Interface
When several serial devices are configured as slaves, addressable by the processor, DIN pins of each decode logic individually control CS of each slave device. When a slave is selected, its CS pin is driven low, data is shifted in, and CS is driven high to latch the data. Typically, only one slave is addressed at a time. DOUT is not used.
Serial Digital Interface
The MAX349/MAX350 interface can be thought of as an 8-bit shift register controlled by CS (Figure 2). While CS is low, input data appearing at DIN is clocked into the shift register synchronously with SCLK's rising edge. The input is an 8-bit word, each bit controlling one of the eight switches (Tables 1 and 2). DOUT is the output of the shift register, with data appearing synchronously with SCLK's falling edge. Data at DOUT is simply the input data delayed by eight clock cycles. When shifting the input data, D7 is the first bit in and out of the shift register. While shifting data, the switches remain in their previous configuration. When the eight bits of data have been shifted in, CS is driven high. This updates the new switch configuration and inhibits further data from entering the shift register. Transitions at DIN and SCLK have no effect when CS is high, and DOUT holds the first input bit (D7) at its output. More or fewer than eight clock cycles can be entered during the CS low period. When this happens, the shift register contains only the last eight serial data bits, regardless of when they were entered. On the rising edge of CS, all switches are set to the corresponding states. The MAX349/MAX350 three-wire serial interface is compatible with SPI, QSPI, and MICROWIRE standards. If interfacing with a Motorola processor serial interface, set CPOL = 0. The MAX349/MAX350 are considered to be slave devices (Figures 2 and 3). At power-up, the shift register contains all zeros, and all switches are off. The latch that drives the analog switch is updated on the rising edge of CS, regardless of SCLK's state. This meets all SPI and QSPI requirements.
Applications Information
8x1 Multiplexer
The MAX349 can be programmed normally, with only one channel selected for every eight clock pulses, or it can be programmed in a fast mode, where channel changing occurs on each clock pulse. In fast mode, select the channels by sending a single high pulse (corresponding to the selected channel) at DIN, and a corresponding CS low pulse for every eight clock pulses. As SCLK clocks this through the register, each switch sequences one channel at a time, starting with channel 0.
SWITCHES UPDATED CS
SCLK DATA CLOCKED IN DIN D7 MSB INPUT DATA BITS DATA CLOCKED OUT DOUT D7 D6 D5 D4 D3 D2 D1 D0 DATA BITS FROM PREVIOUS DATA INPUT DOUT POWER-UP DEFAULT: D7-D0 = 0 D7 D6 D5 D4 D3 D2 D1 D0 LSB
Daisy-Chaining
For a simple interface using several MAX349s and MAX350s, "daisy-chain" the shift registers as shown in Figure 5. The CS pins of all devices are connected,
14
Figure 2. 3-Wire Interface Timing
______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
Table 1. MAX349 Serial-Interface Switch Programming
DATA BITS RESET 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D7 X 0 1 0 1 X X X X X X X X X X X X X X D6 X 0 1 X X 0 1 X X X X X X X X X X X X D5 X 0 1 X X X X 0 1 X X X X X X X X X X D4 X 0 1 X X X X X X 0 1 X X X X X X X X D3 X 0 1 X X X X X X X X 0 1 X X X X X X D2 X 0 1 X X X X X X X X X X 0 1 X X X X D1 X 0 1 X X X X X X X X X X X X 0 1 X X D0 X 0 1 X X X X X X X X X X X X X X 0 1 MAX349 FUNCTION All switches open, D7-D0 = 0 All switches open, D7-D0 = 0 All switches closed to COM, D7-D0 = 1 Switch 7 open (off) Switch 7 closed to COM Switch 6 open (off) Switch 6 closed to COM Switch 5 open (off) Switch 5 closed to COM Switch 4 open (off) Switch 4 closed to COM Switch 3 open (off) Switch 3 closed to COM Switch 2 open (off) Switch 2 closed to COM Switch 1 open (off) Switch 1 closed to COM Switch 0 open (off) Switch 0 closed to COM
Table 2. MAX350 Serial-Interface Switch Programming
DATA BITS RESET 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D7 X 0 1 0 1 X X X X X X X X X X X X X X D6 X 0 1 X X 0 1 X X X X X X X X X X X X D5 X 0 1 X X X X 0 1 X X X X X X X X X X D4 X 0 1 X X X X X X 0 1 X X X X X X X X D3 X 0 1 X X X X X X X X 0 1 X X X X X X D2 X 0 1 X X X X X X X X X X 0 1 X X X X D1 X 0 1 X X X X X X X X X X X X 0 1 X X D0 X 0 1 X X X X X X X X X X X X X X 0 1 MAX350 FUNCTION All switches open, D7-D0 = 0 All switches open, D7-D0 = 0 All "A" switches closed to COMA; All "B" switches closed to COMB, D7-D0 = 1 Switch NO0B open (off) Switch NO0B closed Switch NO1B open (off) Switch NO1B closed Switch NO2B open (off) Switch NO2B closed Switch NO3B open (off) Switch NO3B closed Switch NO3A open (off) Switch NO3A closed Switch NO2A open (off) Switch NO2A closed Switch NO1A open (off) Switch NO1A closed Switch NO0A open (off) Switch NO0A closed
X = Don't care. Data bit D7 is first bit in; data bit D0 is last in.
______________________________________________________________________________________ 15
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
Dual, Differential 4-Channel Multiplexer
The MAX350 can be programmed normally, with only one differential channel selected for every eight clock pulses, or it can be programmed in a fast mode, where channel changing occurs on each clock pulse. In fast mode, select the channels by sending two high pulses, spaced four clock pulses apart (corresponding to the two selected channels) at DIN, and a corresponding CS low pulse for each of the first eight clock pulses. As SCLK clocks this through the register, each switch sequences one differential channel at a time, starting with channel 0. Repeat this process for subsequent channel sequencing after the first eight bits have been sent. For even faster channel sequencing, send only one DIN high pulse and one CS low pulse for every four clock pulses.
Reset Function
RESET is the internal reset pin. It is usually connected to a logic signal or V+. Drive RESET low to open all switches and set the contents of the internal shift register to zero simultaneously. When RESET is high, the part functions normally and DOUT is sourced from V+. RESET must not be driven beyond V+ or GND.
SCLK
SK SO SI I/O MICROWIRE PORT
DOUT
MISO MOSI SCK I/O
MAX349 DIN MAX350
DOUT CS
MAX349 DIN MAX350
SCLK CS
SPI PORT
CPOL = 0, CPHA = 0 THE DOUT-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX349/MAX350, BUT MAY BE USED FOR DATA-ECHO PURPOSES. THE DOUT-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX349/MAX350, BUT MAY BE USED FOR DATA-ECHO PURPOSES.
Figure 3. Connections for MICROWIRE
Figure 4. Connections for SPI and QSPI
SCLK
SCLK
SCLK
SCLK
MAX349
DIN DIN MAX350 DOUT
MAX349
DIN MAX350 DOUT
MAX349
DIN MAX350 DOUT
CS
CS
CS
CS TO OTHER SERIAL DEVICES
Figure 5. Daisy-Chained Connection
16 ______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
DIN SCLK CS1 CS2 CS3 TO OTHER SERIAL DEVICES
CS
CS
CS
MAX349
SCLK MAX350
MAX349
SCLK MAX350
MAX349
SCLK MAX350
DIN
DIN
DIN
Figure 6. Addressable Serial Interface
D4 SCLK SW4 DIN FOUR CLOCK PULSES SW0
D0
Virtually all the analog leakage current is through the ESD diodes. Although the ESD diodes on a given signal pin are identical, and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or V- and the analog signal. This means their leakages vary as the signal varies. The difference in the two diode leakages to the V+ and V- pins constitutes the analog signal-path leakage current. All analog leakage current flows to the supply terminals, not to the other switch terminal. This is why both sides of a given switch can show leakage currents of either the same or opposite polarity. There is no connection between the analog signal paths and GND. V+ and GND power the internal logic and logic-level translators, and set both the input and output logic limits. The logic-level translators convert the logic levels to switched V+ and V- signals to drive the analog signal gates. This drive signal is the only connection between the logic supplies (and signals) and the analog supplies. V+ and V- have ESD-protection diodes to GND. The logic-level inputs and output have ESD protection to V+ and to GND. The logic-level thresholds are CMOS and TTL compatible when V+ is +5V. As V+ rises, the threshold increases slightly. Therefore, when V+ reaches +12V, the threshold is about 3.1V; above the TTL-guaranteed high-level minimum of 2.8V, but still compatible with CMOS outputs.
Figure 7. Differential Multiplexer Input Control
Power-Supply Considerations
Overview The MAX349/MAX350 construction is typical of most CMOS analog switches. It has three supply pins: V+, Vand GND. V+ and V- are used to drive the internal CMOS switches, and they set the limits of the analog voltage on any switch. Reverse ESD-protection diodes are internally connected between each analog signal pin and both V+ and V-. If any analog signal exceeds V+ or V-, one of these diodes will conduct. During normal operation, these (and other) reverse-biased ESD diodes leak, forming the only current drawn from V+ or V-.
______________________________________________________________________________________
17
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
Bipolar Supplies The MAX349/MAX350 operate with bipolar supplies from 3.0V and 8V. The V+ and V- supplies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 17V. Do not connect the MAX349/MAX350 V+ to +3V and connect the logiclevel pins to TTL logic-level signals. This exceeds the absolute maximum ratings and can damage the part and/or external circuits. Single Supply The MAX349/MAX350 operate from single supplies between +3V and +16V when V- is connected to GND. All of the bipolar precautions must be observed.
High-Frequency Performance
In 50 systems, signal response is reasonably flat up to 50MHz (see Typical Operating Characteristics). Above 20MHz, the on response has several minor peaks that are highly layout dependent. The problem is not turning the switch on, but turning it off. The off-state switch acts like a capacitor and passes higher frequencies with less attenuation. At 10MHz, off-isolation is about -45dB in 50 systems, becoming worse (approximately 20dB per decade) as frequency increases. Higher circuit impedances also make off-isolation worse. Adjacent channel attenuation is about 3dB above that of a bare IC socket, and is entirely due to capacitive coupling.
Pin Configurations/Functional Diagrams (continued)
TOP VIEW
SCLK 1 V+ 2 DIN 3 GND 4 COM 5 NO0 6 NO1 7 NO2 8 NO3 9 N.C. 10 LOGIC
MAX349
20 CS 19 RESET 18 DOUT 17 V16 N.C. 15 N.C. 14 NO7 13 NO6 12 NO5 11 NO4
SCLK 1 V+ 2 DIN 3 GND 4 COMA 5 NO0A 6 NO1A 7 NO2A 8 NO3A 9 N.C. 10
MAX350
LOGIC
20 CS 19 RESET 18 DOUT 17 V16 N.C. 15 COMB 14 NO0B 13 NO1B 12 NO2B 11 NO3B
SSOP
SSOP
N.C. = NOT INTERNALLY CONNECTED
18
______________________________________________________________________________________
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers
Ordering Information (continued)
PART MAX349EPN MAX349EWN MAX349EAP MAX349MJN MAX350CPN MAX350CWN MAX350CAP MAX350C/D MAX350EPN MAX350EWN MAX350EAP MAX350MJN TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -55C to +125C PIN-PACKAGE 18 Plastic DIP 18 Wide SO 20 SSOP 18 CERDIP** 18 Plastic DIP 18 Wide SO 20 SSOP Dice* 18 Plastic DIP 18 Wide SO 20 SSOP 18 CERDIP**
GND COM NO0 NO7 0.120" (3.05mm) NO1 NO6 V+ DIN SCLK
_________________Chip Topographies
MAX349
CS RESET DOUT V-
MAX349/MAX350
* Contact factory for dice specifications. ** Contact factory for availability.
NO2
NO3
NO4 0.100" (2.54mm)
NO5
MAX350
V+ DIN SCLK CS RESET DOUT
VGND COMA NO0A COMB NO0B 0.120" (3.05mm) NO1B
NO1A
NO2A
NO3A
NO3B 0.100" (2.54mm)
NO2B
TRANSISTOR COUNT: 500 SUBSTRATE CONNECTED TO V+.
______________________________________________________________________________________ 19
Serially Controlled, Low-Voltage, 8-Channel/Dual 4-Channel Multiplexers MAX349/MAX350
________________________________________________________Package Information
SSOP.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICW.EPS

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