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74AC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

74AC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

s HIGH SPEED: tPD =4.5 ns (TYP.) at VCC = 5V

s LOW POWER DISSIPATION:

ICC = 8 µA (MAX.) at TA = 25 oC

s HIGH NOISE IMMUNITY:

VNIH = VNIL = 28% VCC (MIN.)

s 50Ω TRANSMISSION LINE DRIVING

CAPABILITY

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 24 mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s OPERATING VOLTAGE RANGE:

VCC (OPR) = 2V to 6V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

s IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The AC257 is an advanced high-speed CMOS

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

fabricated with sub-micron silicon gate and

double-layer metal wiring C2MOS technology.

It is ideal for low power applications mantaining

high speed operation similar to equivalent Bipolar

Schottky TTL.

B

M

(Plastic Package)

(Micro Package)

ORDER CODES :

74AC257B

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 chosen.

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

April 1997

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