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April 2001

s

s

LOW POWER DISSIPATION:

s

COMPATIBLE WITH TTL OUTPUTS

s

50

Ω TRANSMISSION LINE DRIVING

CAPABILITY

s

SYMMETRICAL OUTPUT IMPEDANCE:

s

BALANCED PROPAGATION DELAYS:

s

OPERATING VOLTAGE RANGE:

s

PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

s

IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74ACT257 is an advanced high-speed CMOS

QUAD 2-CHANNEL MULTIPLEXER (3-STATE)

fabricated

with

sub-micron silicon gate and

It is composed of an independent 2-channel

multiplexer with common SELECT and ENABLE

(OE)inputs. It is a non-inverting multiplexer. When

the ENABLE input is held HIGH, the outputs are

forced to a high impedance state. When the

SELECT input is held LOW, "A" data is selected;

when

SELECT input is held HIGH, "B" data is

selected.

The device is designed to interface directly High

Speed CMOS systems with TTL, NMOS and

CMOS output voltage levels.

All

inputs

and

outputs

are

equipped

with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

74ACT257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

PIN CONNECTION AND IEC LOGIC SYMBOLS

ORDER CODES

PACKAGE

TUBE

T & R

DIP

74ACT257B

SOP

74ACT257M

74ACT257MTR

TSSOP

74ACT257TTR

TSSOP

DIP

SOP