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74VHCT257A

STMicroelectronics
Part Number 74VHCT257A
Manufacturer STMicroelectronics
Description QUAD 2 CHANNEL MULTIPLEXER
Published Mar 22, 2005
Detailed Description ® 74VHCT257A QUAD 2 CHANNEL MULTIPLEXER (3-STATE) PRELIMINARY DATA s s s s s s s s s s HIGH SPEED: tPD = 5.8 n...
Datasheet PDF File 74VHCT257A PDF File

74VHCT257A
74VHCT257A

Overview
® 74VHCT257A QUAD 2 CHANNEL MULTIPLEXER (3-STATE) PRELIMINARY DATA s s s s s s s s s s HIGH SPEED: tPD = 5.
8 ns (TYP.
) at VCC = 5V LOWPOWER DISSIPATION: ICC = 4 µA (MAX.
) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN), VIL = 0.
8V (MAX) POWER DOWN PROTECTION ON INPUTS & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.
5V to 5.
5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY LOWNOISE: VOLP = 0.
8V (Max.
) SOP PACKAGE SOP TSSOP T UBE 74VHCT257AM TSSOP T& R 74VHCT257AMTR 74VHCT257ATTR ORDER CODES DESCRIPTION The 74VHCT257A is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.
It is composed of four independent 2 channel multiplexers with common SELECT and ENABLE INPUT.
PIN CONNECTION AND IEC LOGIC SYMBOLS The 74VHCT257A is a non inverting multiplexer.
When the ENABLE INPUT is held ”High”, all outputs become high impedance state.
If SELECT INPUT is held ”Low”, ”A” data is selected, when SELECT INPUT is ”High”, ”B” data is chosen.
Power down protection is provided on all inputs and output and 0 to 7V can be accepted on inputs with no regard to the supply voltage.
This device can be used to interface 5V to 3V.
All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
March 2000 1/9 74VHCT257A INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 5, 14, 11 3, 6, 13, 10 4, 7, 12, 9 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y OE GND VCC NAME AND FUNCT ION Common Data Select Input Data Inputs from Source A Data Inputs from Source B 3 State Multiplexer Outputs 3 State Output Enable Input (Active LOW) Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT S OE H L L L L X = DON’T CARE Z = HIGH IMPEDANCE OUTPUTS A X L H X X B X X X L H Y Z L ...


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