54AC257 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – Quad 2-Input Multiplexer with TRI-STATE Outputs

July 1998
54AC257 • 54ACT257
Quad 2-Input Multiplexer with TRI-STATE^® Outputs
General Description
The ’AC/’ACT257 is a quad 2-input multiplexer with
TRI-STATE outputs. Four bits of data from two sources can
be selected using a Common Data Select input. The four
outputs present the selected data in true (noninverted) form.
The outputs may be switched to a high impedance state by
placing a logic HIGH on the common Output Enable (OE) in-
put, allowing the outputs to interface directly with
bus-oriented systems.
Features
n I_CC and I_OZ reduced by 50%
n Multiplexer expansion by tying outputs together
n Noninverting TRI-STATE outputs
n Outputs source/sink 24 mA
n ’ACT257 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC257: 5962-88703
— ’ACT257: 5962-89689
Logic Symbols
IEEE/IEC
DS100286-1
Pin Names
S
OE
I_0a– I_0d
I_1a– I_1d
Z_a– Z_d
Description
Common Data Select Input
TRI-STATE Output Enable Input
Data Inputs from Source 0
Data Inputs from Source 1
TRI-STATE Multiplexer Outputs
DS100286-2
TRI-STATE^® is a registered trademark of National Semiconductor Corporation.
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100286
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