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 FST16233 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch
September 1997 Revised November 2000
FST16233 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch
General Description
The Fairchild Switch FST16233 is a 16-bit to 32-bit highspeed CMOS TTL-compatible multiplexer/demultiplexer bus switch. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. The device can be used in applications where two buses need to be addressed simultaneously. The FST16233 can be used as two 8-bit to 16-bit multiplexers or as one 16-bit to 32-bit multiplexer. Two select (S1, S0) and two test (TEST0, TEST1) inputs provide switch enable and multiplexer select control. The FST16233 is designed to prevent through-current when switching buses.
Features
s 4 switch connection between two ports. s Minimal propagation delay through the switch. s Low lCC. s Zero bounce in flow-through mode. s Control inputs compatible with TTL level.
Ordering Code:
Order Number FST16233MEA FST16233MTD Package Number MS56A MTD56 Package Description 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Diagram
(c) 2000 Fairchild Semiconductor Corporation
DS500055
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FST16233
Connection Diagram
Pin Descriptions
Pin Name S0 , S1 TEST0, TEST1 A B1 , B2 Description Select Inputs Test Inputs Bus A Bus B
Truth Table
Inputs S L H X TEST L L H Function A = B1 A = B2 A = B1 and A = B2
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FST16233
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Switch Voltage (VS) DC Input Voltage (VIN) (Note 2) DC Input Diode Current (lIK) VIN < 0V DC Output (IOUT) Sink Current DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG)
-0.5V to +7.0V -0.5V to +7.0V -0.5V to +7.0V -50mA
128mA
Recommended Operating Conditions (Note 3)
Power Supply Operating (VCC) Input Voltage (VIN) Output Voltage (VOUT) Input Rise and Fall Time (tr, tf) Switch Control Input Switch I/O Free Air Operating Temperature (TA) 0nS/V to 5nS/V 0nS/V to DC 4.0V to 5.5V 0V to 5.5V 0V to 5.5V
+/- 100mA -65C to +150 C
-40 C to +85 C
Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum rating. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Note 2: The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. Note 3: Unused control inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol VIK VIH VIL II IOFF RON Parameter Clamp Diode Voltage HIGH Level Input Voltage LOW Level Input Voltage Input Leakage Current OFF-STATE Leakage Current Switch On Resistance (Note 5) VCC (V) 4.5 4.0-5.5 4.0-5.5 5.5 0 5.5 4.5 4.5 4.5 4.0 ICC ICC Quiescent Supply Current Increase in ICC per Input 5.5 5.5 4 4 8 11 2.0 0.8 1.0 10 1.0 7 7 12 20 3 2.5 TA = -40 C to +85 C Min Typ (Note 4) Max -1.2 Units V V V A A A A mA 0 VIN 5.5V VIN = 5.5V 0 A, B VCC VIN = 0V, IIN = 64mA VIN = 0V, IIN = 30mA VIN = 2.4V, IIN = 15mA VIN = 2.4V, IIN = 15mA VIN = VCC or GND, IOUT = 0 One input at 3.4V Other inputs at VCC or GND
Note 4: Typical values are at VCC = 5.0V and TA = +25C Note 5: Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is determined by the lower of the voltages on the two (A or B) pins.
Conditions IIN = -18mA
3
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FST16233
AC Electrical Characteristics
TA = -40 C to +85 C, Symbol Parameter CL = 50pF, RU= RD = 500 VCC = 4.5 - 5.5V Min tPHL, tPLH tPHL,tPLH tPZH, tPZL tPHZ, tPLZ A or B, to B or A (Note 6) S to A Output Enable Time, S or TEST to B Output Disable Time, S or TEST to B 1.5 Max 0.25 6.1 VCC = 4.0V Min Max 0.25 6.8 ns ns VI = OPEN VI = OPEN VI = 7V for tPZL, VI = OPEN for tPZH VI = 7V for tPLZ, VI = OPEN for tPHZ Figures 1, 2 Figures 1, 2 Figures 1, 2 Figures 1, 2 Units Conditions Figure No.
1.0 1.5
6.5 7.8
7.2 8.5
ns ns
Note 6: This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage source (zero output impedance).
Capacitance
Symbol CIN CI/O
(Note 7)
Parameter Typ 4 6 Max Units pF pF Conditions VCC = 5.0V VCC = 5.0V, Switch OFF
Control pin Input Capacitance Input/Output Capacitance
Note 7: TA = +25C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50 source terminated in 50 Note: CL includes load and stray capacitance Note: Input PRR = 1.0 MHz, tW = 500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
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FST16233
Physical Dimensions inches (millimeters) unless otherwise noted
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide Package Number MS56A
5
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FST16233 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD56
Technology Description
The Fairchild Switch family derives from and embodies Fairchild's proven switch technology used for several years in its 74LVX3L384 (FST3384) bus switch product.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 6 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com


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