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54ACT257FN/a10avaiQuad 2-Input Multiplexer with TRI-STATE Outputs


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54ACT257
Quad 2-Input Multiplexer with TRI-STATE Outputs
TL/F/9949
54AC/74AC257
54ACT/74ACT257
Quad
2-Input
Multiplexer
with
TRI-STATE
Outputs
March 1993
54AC/74AC257#54ACT/74ACT257
Quad 2-Input Multiplexer with TRI-STATEÉ Outputs
General Description
The ’AC/’ACT257isa quad 2-input multiplexer with
TRI-STATE outputs. Fourbitsof data fromtwo sourcescan selected usinga Common Data Select input. The four
outputs presentthe selected datain true(noninverted)form.
The outputs maybe switchedtoa high impedance stateby
placinga logic HIGHonthe common Output Enable (OE)
input, allowingthe outputsto interface directly with bus-ori-
ented systems.
Features ICCandIOZ reducedby 50% Multiplexer expansionby tying outputs together Noninverting TRI-STATE outputs Outputs source/sink24mA ’ACT257has TTL-compatible inputs Standard Military Drawing (SMD) ’AC257: 5962-88703 ’ACT257: 5962-89689
Logic Symbols
TL/F/9949–1
IEEE/IEC
TL/F/9949–2
Connection Diagrams
Pin Assignment
forDIP, Flatpakand SOIC
TL/F/9949–3
Pin Assignment
for LCC
TL/F/9949–4
Pin Names Description Common DataSelect Input TRI-STATE Output EnableInput
I0a–I0d DataInputs from Source0
I1a–I1d DataInputs from Source1
Za–Zd TRI-STATE Multiplexer Outputs
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
FACTTMisa trademarkof NationalSemiconductor Corporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
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