The 74VHC257 is a non inverting multiplexer.
outputs become high impedance state. If
selected, when SELECT INPUT is 鈥滺igh鈥? 鈥滲鈥?/div>
data is chosen.
Power down protection is provided on all inputs
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.
DESCRIPTION
The 74VHC257 is an advanced high-speed
CMOS QUAD 2 CHANNEL MULTIPLEXER
(3-STATE) fabricated with sub-micron silicon gate
and
double-layer metal
wiring
C
2
MOS
technology.
It is composed of four independent 2 channel
multiplexers with common SELECT and ENABLE
INPUT.
PIN CONNECTION AND IEC LOGIC SYMBOLS
June 1999
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