74ACT257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

April 1997

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 ACT257 is an advanced high-speed CMOS

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

fabricated with sub-micron silicon gate and

double-layer metal wiring C

It is ideal for low power applications mantaining

high speed operation similar to equivalent Bipolar

Schottky TTL.

These IC’s are composed of an independent 2

channel multiplexer with common SELECT and

ENABLE INPUT.

The AC257 is a non inverting multiplexer.

When the ENABLE INPUT is held ”High” outputs

of both IC’s become high impedance state. If

SELECT INPUT is held ”Low”, ”A” data is

selected, when SELECT INPUT is ”High”, ”B”

data is closen.

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.

PIN CONNECTION AND IEC LOGIC SYMBOLS

ORDER CODES :

74ACT257B

74ACT257M

M

(Micro Package)

B

(Plastic Package)

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