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MC74VHCT257AD
Quad 2-Channel Multiplexer with 3-State Outputs
MC74VHCT257A
Quad 2-Channel Multiplexer
with 3-State Outputs
The MC74VHCT257A is an advanced high speed CMOS quad
2–channel multiplexer fabricated with silicon gate CMOS technology.
It achieves high speed operation similar to equivalent Bipolar
Schottky TTL while maintaining CMOS low power dissipation.
It consists of four 2–input digital multiplexers with common select
(S) and enable (OE) inputs. When (OE) is held High, selection of data
is inhibited and all the outputs go Low.
The select decoding determines whether the A or B inputs get routed
to the corresponding Y outputs.
The VHCT inputs are compatible with TTL levels. This device can be
used as a level converter for interfacing 3.3 V to 5.0 V because it has full
5 V CMOS level output swings.
The VHCT257A input structures provide protection when voltages
between 0 V and 5.5 V are applied, regardless of the supply voltage. The
output structures also provide protection when VCC = 0 V . These input and
output structures help prevent device destruction caused by supply
voltage—input/output voltage mismatch, battery backup, hot insertion, etc.
The internal circuit is composed of three stages, including a buffered
output which provides high noise immunity and stable output. The inputs
tolerate voltages up to 7 V , allowing the interface of 5 V systems to 3 V
systems. High Speed: tPD = 4.1ns (Typ) at VCC = 5V Low Power Dissipation: ICC = 4μA (Max) at TA = 25°C TTL–Compatible Inputs: VIL = 0.8 V; VIH = 2.0 V Power Down Protection Provided on Inputs and Outputs Balanced Propagation Delays Designed for 2V to 5.5V Operating Range Low Noise: VOLP = 0.8V (Max) Pin and Function Compatible with Other Standard Logic Families Latchup Performance Exceeds 300mA ESD Performance: HBM > 2000V; Machine Model > 200V
GND
VCC
http://
SO–16
D SUFFIX
CASE 751B
MARKING DIAGRAMS 816
8 9
TSSOP–16
DT SUFFIX
CASE 948F
ORDERING INFORMATION
EIAJ SO–16
M SUFFIX
CASE 966VHCT257A
ALYW = Assembly Location
L, WL = Wafer Lot = Year
W, WW= Work Week 9 8
