74VHCT157A
QUAD 2 CHANNEL MULTIPLEXER
PRELIMINARY DATA
March 2000
n HIGH SPEED: tPD = 6.2 ns (TYP.) at VCC =5V
n LOW POWER DISSIPATION:
ICC =4 µA (MAX.) at TA =25
o
C
n COMPATIBLEWITH TTL OUTPUTS:
VIH =2V(MIN),VIL = 0.8V(MAX)
n POWERDOWN PROTECTIONON INPUTS &
OUTPUTS
n SYMMETRICAL OUTPUT IMPEDANCE:
|IOH|=IOL = 8 mA (MIN)
n BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
n OPERATING VOLTAGE RANGE:
VCC (OPR) = 4.5V to 5.5V
n PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
n IMPROVED LATCH-UP IMMUNITY
n LOW NOISE: V
OLP
= 0.8V(Max.)
DESCRIPTION
The 74VHCT157A is an high-speed CMOS
QUAD 2-CHANNEL MULTIPLEXER fabricated
with sub-micron silicon gate and double-layer
metal wiring C
2
MOS technology.
It consists of four 2-input digital multiplexers with
common select and strobe inputs. It is a
non-inverting multiplexer. When the STROBE
input is held high, selection of data is inhibited
and all the outputs become low. The SELECT
decoding determines whether the A or B inputs
get routed to their corresponding Y outputs.
Power down protection is provided on all inputs
and outputs 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS

SOP TSSOP
ORDER CODES
PACKAGE TUBE T & R
SOP 74VHCT157AM 74VHCT157AMTR
TSSOP 74VHCT157ATTR
1/9