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19-3915; Rev 1; 1/07
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
General Description
The MAX4818/MAX4819 high-bandwidth, low-on-resistance analog dual SPDT switches/4:1 multiplexers are designed to serve as integrated T1/E1 protection switches for 1+1 and N+1 line-card redundancy applications. Each MAX4818/MAX4819 replaces four electromechanical relays, significantly reducing board space, simplifying PC board routing, and reducing power consumption. These devices operate with 3.3V or 5V dual supplies for applications requiring T1/E1 signal switching in the line side of the interface transformer. Internal voltage multipliers drive the analog switches, yielding excellent linearity and low 4 typical on-resistance within the T1/E1 analog signal range. This high-bandwidth family of products is optimized for low return loss and matched pulse template performance in T1/E1 long-haul and short-haul applications. The MAX4818/MAX4819 are available in a tiny 16-pin, 5mm x 5mm, thin QFN package and are specified over the extended -40C to +85C temperature range.
Features
Dual SPDT and 4:1 Multiplexer Configurations Dual-Supply Operation from 3.3V to 5V Single-Supply Operation from +6V to +11V Hot-Insertion Tolerant with No DC Path to the Supplies Low On-Resistance, RON = 4 (typ) and 6 (max) Over 350MHz -3dB Signal Bandwidth (MAX4818) Excellent Crosstalk and Off-Isolation Performance Over the T1/E1 Signal Spectrum: Over 110dB Crosstalk Attenuation at 1MHz (MAX4818) Low Current Consumption of 2mA (max) -40C to +85C Extended Temperature Range Space-Saving, 16-Pin, 5mm x 5mm Thin QFN SET Controls All Switches Simultaneously For Redundancy Switching (MAX4819)
MAX4818/MAX4819
Applications
T1/E1 Redundancy Switching Base Stations and Base-Station Controllers Add and Drop Multiplexers
Pin Configurations
NC1 V+ TOP VIEW NC2 9 N.C. 10
Multi-Service Provisioning Platforms Edge Routers Multi-Service-Switches (MSSs) Digital Loop Carriers Industrial Applications Data Acquisition Telecom Signal Switching Test Equipment Avionics
12
11
COM1
IN1 SET N.C.
13 14
8 7
COM2 IN2 EN N.C.
MAX4818
15 16 6
+
*EP
5
1 NO1
2 V-
3 GND
4 NO2
THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V-
Pin Configurations continued at end of data sheet.
Ordering Information
PART MAX4818ETE+ MAX4819ETE+ TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 16 TQFN-EP* 16 TQFN-EP* CONFIGURATION 2 x SPDT 4:1 MUX PACKAGE CODE T1655-3 T1655-3
*EP = Exposed Paddle Devices are available in lead-free packages.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.) V+ ............................................................................-0.3V to +6V V- .............................................................................-6V to +0.3V V+ to V-...................................................................-0.3V to +12V IN_, A0, A1, SET, EN ....................................-0.3V to (V+) + 0.3V NO_, NC_, COM_ ....................................................-12V to +12V NO_, to COM_, NC_ to COM_ .................................-18V to +18V Continuous Current (NO_, NC_, COM_) ....................... 100mA Continuous Current (Any Other Terminal) ........................30mA Peak Current (NO_, NC_, COM_) (pulsed at 1ms, 10% duty cycle).................................300mA Continuous Power Dissipation (TA = +70C) 16-Pin Thin QFN 5mm x 5mm (derate 33.3mW/C above TA = +70C) ....................................................2667mW Operating Temperature Range ......................... -40C to +85C Storage Temperature Range ........................... -65C to +150C Junction Temperature .....................................................+150C Lead Temperature (soldering, 10s) ............................... +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 3.3V Supplies
(V+ = +3.3V 10%, V- = -3.3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range VCOM_ VNO_ VNC_ V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V (Note 2) V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V (Note 2) V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V (Notes 2, 3) V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = -3V, 0V, +3V (Notes 2, 4) V+ = +3.6V, V- = -3.6V, VCOM_ = -3V, +3V, VNO_ or VNC_ = +3V, -3V V+ = +3.6V, V- = -3.6V, VCOM_ = -3V, +3V, VNO_ or VNC_ = +3V, -3V V+ = +3.6V, V- = -3.6V, VCOM_ = -3V, +3V, VNO_ or VNC_ unconnected TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 0.5 0.3 4 V4 V+ 5 6 5 6.2 0.6 0.8 1.2 1.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4818 On-Resistance
RON
MAX4819 On-Resistance
RON
On-Resistance Match Between Channels
RON
On-Resistance Flatness
RFLAT(ON)
NO or NC Off-Leakage Current
INO_(OFF) INC_(OFF)
-10
+10
nA
COM Off-Leakage Current
ICOM_(OFF)
-10
+10
nA
COM On-Leakage Current
ICOM_(ON)
-15
+15
nA
2
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
ELECTRICAL CHARACTERISTICS--Dual 3.3V Supplies (continued)
(V+ = +3.3V 10%, V- = -3.3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER FAULT Fault Analog Signal Range VCOM_ VNO_ VNC_ INO_ INC_ V+ = +3.3V, V- = -3.3V -11 +11 V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4818/MAX4819
NO or NC Off-Leakage Current
V+ = +3.3V, V- = -3.3V, VCOM_ = +11V, -11V, VNO_ or VNC_ = -5.5V, +5.5V V+ = +3.3V, V- = -3.3V, VCOM_ = +11V, -11V, VNO_ or VNC_ = -5.5V, +5.5V RL = 50, f = 1.024MHz, Figure 4 RL = 50, f = 30MHz, Figure 4 RL = 50, f = 1.024MHz RL = 50, f = 30MHz VCOM_ to VNO_ or VNC_, RL = 50, f = 1.024MHz, Figure 4 VCOM_ to VNO_ or VNC_, RL = 50, f = 30MHz, Figure 4 RS = RL = 50, Figure 4 f = 1MHz, Figure 5 f = 1MHz, Figure 5 f = 1MHz, Figure 5 CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3 VNO_, VNC_, VCOM_ = -11V VNO_ or VNC_= +3V, RL = 300, CL = 35pF, Figure 2 VNO_ or VNC_= +3V, RL = 300, CL = 35pF, Figure 2 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX MAX4818 MAX4819 MAX4818 MAX4819 MAX4818 MAX4819 MAX4818 MAX4819
-1
+1
A
COM Off-Leakage Current
ICOM_
-1
+1
A
SWITCH DYNAMIC CHARACTERISTICS MAX4818 Crosstalk (Note 5) MAX4819 All-Hostile Crosstalk (Note 6) VCT1 VCT2 VHCT1 VHCT2 VISO1 Off-Isolation (Note 7) VISO2 On-Channel -3dB Bandwidth COM On-Capacitance COM Off-Capacitance NC/NO Off-Capacitance Charge Injection Fault Recovery Time Turn-On Time BW CON(COM_) COFF(COM_) COFF Q tREC tON 110 77 50 17 60 dB 30 350 220 20 40 15 30 7 35 60 128 20 50 50 0.5 1 1 128 s s s MHz pF pF pF pC s dB dB
Turn-Off Time Power-Up Delay
tOFF tDEL
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3
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
ELECTRICAL CHARACTERISTICS--Dual 3.3V Supplies (continued)
(V+ = +3.3V 10%, V- = -3.3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Voltage Low Input Voltage High Input Leakage Current POWER SUPPLY Quiescent Positive Supply Current Quiescent Negative Supply Current Positive Supply Voltage Negative Supply Voltage I+ IV+ VV+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+ V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+ 3.0 -3.6 0.8 0.8 2 2 3.6 -3.0 mA mA V V SYMBOL VIL VIH IIN VIN_ = 0 or V+ 2.4 -1 +1 CONDITIONS MIN TYP MAX 0.8 UNITS V V A LOGIC INPUT (IN_, EN, SET, A0, A1)
ELECTRICAL CHARACTERISTICS--Dual 5V Supplies
(V+ = +5V 10%, V- = -5V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range VCOM_ VNO_ VNC_ RON TA = +25C V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, TA = TMIN to VNO_ or VNC_ = +3V (Note 2) TMAX TA = +25C V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, TA = TMIN to VNO_ or VNC_ = +3V (Note 2) TMAX V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, VNO_ or VNC_ = +3V (Notes 2, 3) TA = +25C TA = TMIN to TMAX 0.5 V4 V+ 5 6 4 5 6.2 0.3 0.6 0.8 1.2 1.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4818 On-Resistance
MAX4819 On-Resistance
RON
On-Resistance Match Between Channels
RON
On-Resistance Flatness
RFLAT(ON)
V+ = +4.5V, V- = -4.5V, TA = +25C ICOM_ = 30mA, VNO_ or VNC_ = -3V, 0V, +3V TA = TMIN to TMAX (Notes 2, 4) V+ = +5.5V, V- = -5.5V, VCOM_ = -5V, +5V, VNO_ or VNC_ = +5V, -5V -10
NO or NC Off-Leakage Current
INO_(OFF) INC_(OFF)
+10
nA
COM Off-Leakage Current
V+ = +5.5V, V- = -5.5V, ICOM_(OFF) VCOM_ = -5V, +5V, VNO_ or VNC_ = +5V, -5V
-10
+10
nA
4
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
ELECTRICAL CHARACTERISTICS--Dual 5V Supplies (continued)
(V+ = +5V 10%, V- = -5V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER COM On-Leakage Current FAULT Fault Analog Signal Range VCOM_ VNO_ VNC_ INO_ INC_ V+ =5V, V- = -5V V+ = 5V, V- = -5V, VNO_ or VNC_ = +11V, -11V, VCOM_ = -5.5, +5.5V V+ = 5V, V- = -5V, VNO_ or VNC_ = +11V, -11V, VCOM_ = -5.5, +5.5V RL = 50, f = 1.024MHz, Figure 4 RL = 50, f = 30MHz, Figure 4 RL = 50, f = 1.024MHz RL = 50, f = 30MHz VCOM_ to VNO_ or VNC_, RL = 50, f = 1.024MHz, Figure 4 VCOM_ to VNO_ or VNC_, RL = 50, f = 30MHz, Figure 4 RS = RL = 50, Figure 4 MAX4818 MAX4819 MAX4818 MAX4819 MAX4818 MAX4819 MAX4818 MAX4819 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 128 0.5 -11 +11 V SYMBOL ICOM_(ON) CONDITIONS V+ = +5.5V, V- = -5.5V, VCOM_ = -5V, +5V, VNO_ or VNC_ unconnected MIN -15 TYP MAX +15 UNITS nA
MAX4818/MAX4819
NO or NC Off-Leakage Current
-1
+1
A
COM Off-Leakage Current
ICOM_
-1
+1
A
SWITCH DYNAMIC CHARACTERISTICS MAX4818 Crosstalk (Note 5) MAX4819 All-Hostile Crosstalk (Note 6) VCT1 VCT2 VHCT1 VHCT2 VISO1 VISO2 On-Channel -3dB Bandwidth COM On-Capacitance COM Off-Capacitance NC/NO Off-Capacitance Charge Injection Fault Recovery Time Turn-On Time BW 110 77 50 17 60 dB 30 350 220 20 40 15 30 7 35 60 128 20 50 50 1 1 s s s MHz pF pF pF pC s dB dB
Off-Isolation (Note 6)
CON(COM_) f = 1MHz, Figure 5 COFF(COM_) f = 1MHz, Figure 5 COFF Q tREC tON f = 1MHz, Figure 5 CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3 VNO_, VNC_, VCOM_ = -11V VNO_ or VNC_= +3V, RL = 300, CL = 35pF, Figure 2 VNO_ or VNC_= +3V, RL = 300, CL = 35pF, Figure 2
Turn-Off Time Power-Up Delay
tOFF tDEL
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5
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
ELECTRICAL CHARACTERISTICS--Dual 5V Supplies (continued)
(V+ = +5V 10%, V- = -5V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Voltage Low Input Voltage High Input Leakage Current POWER SUPPLY Quiescent Positive Supply Current Quiescent Negative Supply Current Positive Supply Voltage Negative Supply Voltage I+ IV+ VV+ = +5.5V, V- = -5.5V, VIN = 0 or V+ V+ = +5.5V, V- = -5.5V, VIN = 0 or V+ 4.5 -5.5 0.9 0.9 2 2 5.5 -4.5 mA mA V V SYMBOL VIL VIH IIN VIN_ = 0 or V+ 2.4 -1 +1 CONDITIONS MIN TYP MAX 0.8 UNITS V V A
LOGIC INPUT (IN_, EN, SET, A0, A1)
Note 1: Note 2: Note 3: Note 4:
All parameters are production tested at TA = +85C and guaranteed by design over specified temperature range. Guaranteed by design, not production tested. RON = RON_(MAX) - RON_(MIN). Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 5: Between any two switches. Note 6: All-hostile crosstalk from all OFF multiplexer inputs to the ON multiplexer channel. All-hostile crosstalk is tested by applying the same signal to all OFF inputs and measuring the crosstalk on the ON channel (COM terminal of the multiplexer.) Note 7: Off-Isolation = 20log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to OFF switch.
Typical Operating Characteristics
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
MAX4818 ON-RESISTANCE vs. COM_ VOLTAGE
MAX4818 toc01
MAX4818 ON-RESISTANCE vs. COM_ VOLTAGE
MAX4818 toc02
MAX4819 ON-RESISTANCE vs. COM_ VOLTAGE
DUAL 3.3V SUPPLIES TA = +85C ON-RESISTANCE () 4 TA = +25C 3 2 1 0 TA = -40C
MAX4818 toc03
6 DUAL 3.3V SUPPLIES 5 ON-RESISTANCE () 4 3 2 1 0 -3.3 -2.2 -1.1 0 1.1 2.2 TA = +85C TA = +25C TA = -40C
6 5
DUAL 5V SUPPLIES TA = +85C
6 5
ON-RESISTANCE ()
4 TA = +25C 3 TA = -40C 2 1 0
3.3
-5
-3
-1
1
3
5
-3.3
-2.2
-1.1
0
1.1
2.2
3.3
COM_ VOLTAGE (V)
COM_ VOLTAGE (V)
COM_ VOLTAGE (V)
6
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
MAX4819 ON-RESISTANCE vs. COM_ VOLTAGE
MAX4818 toc04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4818 toc05
MAX4818 SUPPLY CURRENT vs. TEMPERATURE
MAX4818 toc06
6 DUAL 5V SUPPLIES 5 TA = +85C ON-RESISTANCE () 4 TA = +25C 3 2 1 0 -5 -3 -1 1 3 5 COM_ VOLTAGE (V) TA = -40C
1000 950 MAX4819 SUPPLY CURRENT (A) 900 850 800 750 700 650 600 3.0 3.5 4.0 4.5 5.0 MAX4818
950 900 SUPPLY CURRENT (A) DUAL 5V SUPPLIES 850 800 750 700 650 -40 -15 10 35 60 DUAL 3.3V SUPPLIES
5.5
85
DUAL SUPPLY VOLTAGE (V)
TEMPERATURE (C)
MAX4819 SUPPLY CURRENT vs. TEMPERATURE
MAX4818 toc07
MAX4818 NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE
500 460 420 380 340 300 260 220 180 140 100 60 20 -20 -60 -40 DUAL 3.6V SUPPLIES 500 460 420 380 340 300 260 220 180 140 100 60 20 -20 -60 -40
MAX4818 toc08
MAX4819 NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE
DUAL 3.6V SUPPLIES
MAX4818 toc09
950 900 SUPPLY CURRENT (A) 850 DUAL 3.3V SUPPLIES 800 750 700 650 -40 -15 10 35 60 DUAL 5V SUPPLIES
LEAKAGE CURRENT (pA)
LEAKAGE CURRENT (pA)
NC_/NO_ = +3V, COM_ = -3V
NO_ = +3V, COM_ = -3V
NC_/NO_ = -3V, COM_ = +3V
NO_ = -3V, COM_ = +3V
85
-15
10
35
60
85
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
MAX4818 NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE
MAX4818 toc10
MAX4819 NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE
MAX4818 toc11
MAX4818 COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE
340 300 LEAKAGE CURRENT (pA) 260 220 180 140 100 60 20 -20 COM_ = -3V, NC_/NO_ = +3V COM_ = +3V, NC_/NO_ = -3V DUAL 3.6V SUPPLIES
MAX4818 toc12
520 440 LEAKAGE CURRENT (pA) 360 280
DUAL 5.5V SUPPLIES
660 580 LEAKAGE CURRENT (pA) 500 420 340 260 180 100 20 -60
380
DUAL 5.5V SUPPLIES
NO_ = +5V, COM_ = -5V NO_ = -5V, COM_ = +5V
NC_/NO_ = +5V, COM_ = -5V 200 120 40 -40 -40 -15 10 35 60 85 TEMPERATURE (C) NC_/NO_ = -5V, COM_ = +5V
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
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7
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
MAX4819 COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE
MAX4818 toc13
MAX4818 COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE
460 420 380 340 300 260 220 180 140 100 60 20 -20 -60 -40
MAX4818 toc14
MAX4819 COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE
DUAL 5.5V SUPPLIES 500 LEAKAGE CURRENT (pA) 420 340 260 180 100 20 -60 COM_ = +5V, NO_ = -5V
MAX4818 toc15
840 760 680 LEAKAGE CURRENT (pA) 600 520 440 360 280 200 120 40 -40 -40
DUAL 3.6V SUPPLIES
DUAL 5.5V SUPPLIES
580
COM_ = +3V, NO_ = -3V
LEAKAGE CURRENT (pA)
COM_ = +5V, NC_/NO_ = -5V
COM_ = -3V, NO_ = +3V
COM_ = -5V, NC_/NO_ = +5V
COM_ = -5V, NO_ = +5V
-15
10
35
60
85
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
MAX4818 COM(ON) LEAKAGE CURRENT vs. TEMPERATURE
MAX4818 toc16
MAX4819 COM(ON) LEAKAGE CURRENT vs. TEMPERATURE
DUAL 3.6V SUPPLIES
MAX4818 toc17
MAX4818 COM(ON) LEAKAGE CURRENT vs. TEMPERATURE
DUAL 5.5V SUPPLIES
MAX4818 toc18
560 500 440 LEAKAGE CURRENT (pA) 380 320 260 200 140 80 20 -20 -40
DUAL 3.6V SUPPLIES
1100 1000 LEAKAGE CURRENT (pA) 900 800 700 600 500 400 300 200 100 0 -100
620 560 500 LEAKAGE CURRENT (pA) 440 380 320 260 200 140 80 20 -40
COM_ = +3V COM_ = -3V
COM_ = +3V
COM_ = +5V
COM_ = -3V
COM_ = -5V
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
MAX4819 COM(ON) LEAKAGE CURRENT vs. TEMPERATURE
1200 1100 1000 900 800 700 600 500 400 300 200 100 0 -100
MAX4818 toc19
CHARGE INJECTION vs. COMMON VOLTAGE
MAX4818 toc20
DUAL 5.5V SUPPLIES
140 100 CHARGE INJECTION (pC) MAX4819 60 20 -20 -60 -100 MAX4818
LEAKAGE CURRENT (pA)
COM_ = +5V
COM_ = -5V
-40
-15
10
35
60
85
-5
-3
-1
1
3
5
TEMPERATURE (C)
VCOM (V)
8
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
MAX4818 CROSSTALK vs. FREQUENCY
MAX4818 toc21
MAX4819 ALL-HOSTILE CROSSTALK vs. FREQUENCY
MAX4818 toc22
-40
0
-60 LOSS (dB) LOSS (dB) 0.1 100
-20
-80
-40
-100
-60
-120 1 10 FREQUENCY (MHz)
-80 0.1 1 10 100 FREQUENCY (MHz)
MAX4818 FREQUENCY RESPONSE
MAX4818 toc23
MAX4819 FREQUENCY RESPONSE
MAX4818 toc24
0 -1 -2 LOSS (dB) -3 -4 -5 -6 -7 0.1 1 10 FREQUENCY (MHz) 100
0 -3 -6 LOSS (dB) -9 -12 -15 -18 -21
1000
0.1
1
10 FREQUENCY (MHz)
100
1000
MAX4818 OFF-ISOLATION vs. FREQUENCY
MAX4818 toc25
MAX4819 OFF-ISOLATION vs. FREQUENCY
MAX4818 toc26
0
0
-20
-20
LOSS (dB)
-60
LOSS (dB) 0.1 100
-40
-40
-60
-80
-80
-100 1 10 FREQUENCY (MHz)
-100 0.1 1 10 100 FREQUENCY (MHz)
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9
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
T1 (100) PULSE TEMPLATE TEST
MAX4818 toc27
T1 (100) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE
MAX4818 toc28
1.2 0.9 NORMALIZED AMPLITUDE 0.6 0.3 0 -0.3 -0.6 -500 -300 -100 100 TIME (ns) 300 500
INPUT 1V/div
OUTPUT 1V/div
700
200ns/div
E1 (120) PULSE TEMPLATE TEST
1.1 NORMALIZED AMPLITUDE 0.9 0.7 0.5 0.3 0.1 -0.1 -0.3 -250 -200 -150 -100 -50 0 50 100 150 200 250 TIME (ns)
MAX4818 toc29
T1 (120) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE
MAX4818 toc30
1.3
INPUT 1V/div
OUTPUT 1V/div 100ns/div
E1 (75) PULSE TEMPLATE TEST
1.1 NORMALIZED AMPLITUDE 0.9 0.7 0.5 0.3 0.1 -0.1 -0.3 -250 -200 -150 -100 -50 0 50 100 150 200 250
MAX4818 toc31
E1 (75) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE
MAX4818 toc32
1.3
INPUT 1V/div
OUTPUT 1V/div 100ns/div
TIME (ns)
10
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
Pin Description
PIN MAX4818 1 2 3 4 5, 10, 16 6 7 8 9 11 12 13 14 15 -- -- -- -- -- EP MAX4819 1 2 3 12 5, 8, 10, 16 6 -- -- -- 11 -- -- -- 15 4 7 9 13 14 EP NAME NO1 VGND NO2 N.C. EN IN2 COM2 NC2 V+ NC1 COM1 IN1 SET NO4 A0 NO3 COM A1 EP FUNCTION Analog Multiplexer Normally Open Terminal 1 Negative Supply Voltage. Bypass V- to ground with a 0.1F ceramic capacitor. Ground Analog Multiplexer Normally Open Terminal 2 No Connect. Not Internally Connected. Enable Input. Connect EN to V+ or a logic-high for normal operation. Connect EN to ground to disable all switches. Switch 2 Logic-Level Input (See Table 1) Analog Switch Common Terminal 2 Analog Switch Normally Close Terminal 2 Positive Supply Voltage. Bypass V+ to ground with a 0.1F ceramic capacitor. Analog Switch Normally Close Terminal 1 Analog Switch Common Terminal 1 Switch 1 Logic-Level Input (See Table 1) Logic Input. Drive SET logic-high to set all switches. (See Tables 1, 2) Analog Multiplexer Normally Open Terminal 4 Multiplexer Address Input 0 (See Table 2) Analog Multiplexer Normally Open Terminal 3 Analog Multiplexer Common Terminal Multiplexer Address Input 1 (See Table 2) Exposed Paddle. Connect exposed paddle to V- or leave unconnected.
MAX4818/MAX4819
Detailed Description
The MAX4818/MAX4819 are each a high-bandwidth, low-on-resistance dual-SPDT analog switch/4:1 multiplexer, respectively. Both the MAX4818 and the MAX4819 are designed to serve as integrated T1/E1 analog protection switches for 1+1 and N+1 line-card redundancy applications. These devices replace electromechanical relays to save board space, reduce power consumption, and simplify PC board routing. The MAX4818/ MAX4819 allow the user to live insert the boards with no adverse effects. The MAX4818/MAX4819 operate from 3.3V or 5V dual supplies, which are required for E1/T1 signal switching in the line-side of the interface transformer. Internal voltage multipliers supply the switches yielding excellent linearity and low on-resistance, typically 4 within the E1/T1 analog signal range. This high-bandwidth family of devices is optimized for low return loss
and matched pulse template performance in E1/T1 short-haul and long-haul applications.
Logic Inputs
The MAX4818 has four digital control inputs: EN, SET, IN1, and IN2. The EN input enables the switches. A logic 1 on SET connects COM to the NO_ terminal. IN_ controls the switch when SET is low, as shown in Table 1. The MAX4819 has four digital control inputs: EN, SET, A1, and A0. The EN input enables the multiplexer. A logic 1 on SET connects all NO_ to COM. A1 and A0 control which terminal will be connected to COM when SET is low, as shown in Table 2.
Analog Signal Levels
The on-resistance of the MAX4818/MAX4819 is very low and stable as the analog signals are swept from V- to V+ (see the Typical Operating Characteristics).
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Fault Protection
The fault protection of the MAX4818/MAX4819 allows the devices to handle input signals of more than twice the supply voltage without clamping the signal, latching up, or disturbing other cards in the system. The device detects when the input voltage drops below the negative supply. As soon as a fault condition is detected, the switch is immediately turned off for 128 clock cycles (typically 128s). At the end of the 128s timeout, the switch is turned back on for one clock cycle. At the end of the one clock cycle, if the signal is within the operating range, the switch will remain on. Otherwise, the device will turn the switch off again for 128 clock cycles. This will repeat until the signal is within the operating range. In T1/E1 redundancy applications, this can happen when the load resistor (RL) is removed or disconnected for any reason, as shown in Figure 1. Without a load resistor, the output voltage when using a 1:2 transformer can be as high as 11V.
Table 1. Dual SPDT Truth Table (MAX4818)
EN 0 1 1 1 SET X 0 0 1 IN_ X 0 1 X COM_ CONNECTION NONE NC_ NO_ NO_
(X = don't care.)
Table 2. 4:1 Multiplexer Truth Table (MAX4819)
EN 0 1 1 1 1 1 SET X 0 0 0 0 1 A1 X 0 0 1 1 X A0 X 0 1 0 1 X COM CONNECTION NONE NO1 NO2 NO3 NO4 NO1, NO2, NO3, NO4
Hot Insertion
The MAX4818/MAX4819 tolerate hot insertions, thus are not damaged when inserted into a live backplane. Competing devices can exhibit low impedance when plugged into a live backplane that can cause high power dissipation leading to damage of the device itself. The MAX4818/MAX4819 have relatively high input impedance when V+ and V- supplies are unconnected or connected to GND. Therefore, the devices are not destroyed by a hot insertion. In order to guarrantee data integrity, the V+ and V- supplies must be properly biased.
(X = don't care.)
5V 10% 1:2 NO
MAX4818 MAX4819
COM RL 10V 10% + Vo -
TTIP LIU Tx TRING
Applications Information
T1/E1 N+1 Redundancy
Figures 6, 7, and 8 show a basic architecture for twistedpair interface (120, E1 or 100, T1). Coaxial cable interface (75, E1) can be illustrated with the same figures but without the single-ended to differential conversion stage. A single protection card can replace up to N line cards in a N+1 redundancy scheme. Figure 6 shows the switches sitting in the line cards where they can reroute any of the input/output signals to a protection line card. Figure 7 shows a "multiplexed" redundancy architecture using the MAX4819 where the multiplexers are in the line cards. This architecture is more scalable as the number of boards is increased. It also does not
Figure 1. Fault Protection
require a dedicated external switching card as the multiplexers reside in the line cards themselves. The number of signals routed through the backplane is substantially higher than in the switching-card architecture. Figure 8 shows a similar architecture, but the multiplexers reside in the protection switching card. These figures do not show the surge-protection elements and resistors for line termination/impedance matching.
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
Test Circuits/Timing Diagrams
V+ V+ 3V NO_ (OR NC_) 3V VIN_ 0V VIN_ MAX4818 MAX4819 COM_ GND VV() FOR MAX4818 RL CL VOUT VOUT 0V tOFF tON 3V 50%
MAX4818/MAX4819
90%
90%
Figure 2. Switch Turn-On/Turn-Off Times
V+ VIN_ IN_ V+ NO_ (OR NC_) MAX4818 MAX4819 COM_ GND VCL V() FOR MAX4818 VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT x CL VOUT RGEN 3V VGEN VIN_ 0V VOUT VOUT
Figure 3. Charge Injection
V+ 0.1F
50 RESISTOR ONLY NEEDED FOR CROSSTALK AND ISOLATION VIN 50 COM_
NETWORK ANALYZER 50
V+ 3.0V MAX4818 MAX4819 IN_
50 VOUT MEAS REF
NO_, (NC_) GND V-
50 0.1F VMEASUREMENTS ARE STANDARDIZED AGAINST SHORT AND OPEN AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ OR NC_ TERMINALS. ON-RESPONSE IS MEASURED BETWEEN COM_ AND ON NO_ OR NC_ TERMINALS. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. () FOR MAX4818
50
Figure 4. On-Loss, Off-Isolation, and Crosstalk ______________________________________________________________________________________ 13
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Test Circuits/Timing Diagrams (continued)
V+ 0.1F
V+ NC_ (OR NO_) V+ MAX4818 MAX4819 COM_ V-
1MHz CAPACITANCE ANALYZER
IN_
GND
0.1F () FOR MAX4818
V-
Figure 5. Channel Off-/On-Capacitance
The low on-resistance and high-bandwidth of the MAX4818/MAX4819 yield good pulse template and return-loss performance (see the Typical Operating Characteristics). The pulse template tests for E1 (twisted-pair interface 120 and coaxial interface 75) and T1 (twisted-pair interface 100) were tested using the Dallas DS2155 single-chip-transceiver evaluation board, and twelve switches in parallel with one switch closed and the other eleven open. The internal transmit
termination feature must be disable when using this circuit. In order to use the same transmit resistors for E1 twisted-pair and coaxial cables, the Transmit Line Buildout Control Register (TLBC) is set to the value 6Ah. This sets the driver voltage so the output pulse has the right amplitude for both 120 (twisted pair) and 75 (coaxial) loads. The analog switches were powered with dual power supplies at 5V.
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
LINE CARD 1 NC1 T1/E1 LIU Tx/Rx COM1 NO1 I/O 1
MAX4818
LINE CARD 2 NC1 T1/E1 LIU Tx/Rx COM1 NO1 I/O 2
MAX4818
LINE CARD 3 NC1 T1/E1 LIU Tx/Rx COM1 I/O 3
NO1
MAX4818
LINE CARD N NC1 T1/E1 LIU Tx/Rx COM1 NO1 I/O N
MAX4818
PROTECTION LINE CARD
T1/E1 LIU Tx/Rx PROTECTION SWITCHING CARD
SINGLE-ENDED TO DIFFERENTIAL CONVERSION
Figure 6. Switch Architecture for Twisted-Pair Cable (120, E1 or 100, T1). Same figure for Coaxial Cable (75, E1) without the singleended-to-differential conversion.
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
LINE CARD 1
1:4 T1/E1 LIU Tx/Rx
I/O 1
MAX4819
LINE CARD 2
1:4 T1/E1 LIU Tx/Rx I/O 2
MAX4819
LINE CARD 3
1:4 T1/E1 LIU Tx/Rx I/O 3
MAX4819
LINE CARD N
1:4 T1/E1 LIU Tx/Rx
MAX4819
I/O N
PROTECTION LINE CARD
1:4 T1/E1 LIU Tx/Rx
MAX4819
BACKPLANE
SINGLE-ENDED TO DIFFERENTIAL CONVERSION
Figure 7. Multiplexed Redundancy Architecture with Multiplexer in the Line Cards for Twisted-Pair Cable (120, E1 or 100, T1). Same figure for coaxial cable (75, E1) without the single-ended-to-differential conversion.
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
LINE CARD 1
1:4 T1/E1 LIU Tx/Rx
I/O 1
MAX4819
LINE CARD 2
1:4 T1/E1 LIU Tx/Rx I/O 2
MAX4819
LINE CARD 3
1:4 T1/E1 LIU Tx/Rx I/O 3
MAX4819
LINE CARD N
1:4 T1/E1 LIU Tx/Rx
MAX4819
I/O N
PROTECTION LINE CARD
1:4 T1/E1 LIU Tx/Rx
MAX4819
PROTECTION SWITCHING CARD
SINGLE-ENDED TO DIFFERENTIAL CONVERSION
Figure 8. Multiplexed Redundancy Architecture with Multiplexer Out of the Line Cards for Twisted-Pair Cable (120, E1 or 100, T1). Same figure for coaxial cable (75, E1) without the single-ended-to-differential conversion.
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Typical Operating Circuits
. .. .. . . .. .. .
..
.
LINE CARD N
..
.
LINE CARD 2 LINE CARD 1 IN1 NC1 T1/E1 LIU Tx COM1 NO1 ZL NC2 T1/E1 LIU Rx ZL IN2 ZL TRANSMIT
COM2 NO2 RECEIVE
MAX4818
PROTECTION LINE CARD T1/E1 LIU Tx ZL
ZL
T1/E1 LIU Rx ZL
ZL = 75, 100, OR 120
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
Typical Operating Circuits (continued)
. . .. . .. .. .
MAX4818/MAX4819
..
.
LINE CARD N
..
..
.
LINE CARD 2 LINE CARD 1 COM T1/E1 LIU Tx NO1 NO2 NO3 NO4 ZL ZL COM T1/E1 LIU Rx ZL
TRANSMIT
MAX4819
NO1 NO2 NO3 NO4 ZL
RECEIVE
MAX4819
BACKPLANE
PROTECTION LINE CARD COM T1/E1 LIU Tx ZL COM T1/E1 LIU Rx ZL
NO1 NO2 NO3 NO4
MAX4819
NO1 NO2 NO3 NO4
MAX4819
ZL = 75, 100, OR 120
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
Functional Diagram
V+ NO1 NC1 NO2 NC2 CONTROL LOGIC IN1 NO1 COM1 IN2 COM2 SET EN VCONTROL LOGIC NO2 NO3 NO4
V+
COM
A1 A0 SET EN V-
MAX4818
GND
MAX4819
GND
Chip Information
PROCESS: BiCMOS CONNECT EXPOSED PADDLE TO V-.
Pin Configurations (continued)
NO2 N.C. 10 NO3 9
12
11
COM
A1 SET N.C.
13 14
V+
TOP VIEW
8 7
N.C. A0 EN N.C.
MAX4819
15 16 6
+
*EP
5
1 NO1
2 V-
3 GND
4 NO4
THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V-
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High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
QFN THIN.EPS
MAX4818/MAX4819
Revision History
Pages changed at Rev 1: 1, 12, 21
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
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