54AC251 • 54ACT251
8-Input Multiplexer with TRI-STATE
®
Output
General Description
The ’AC/’ACT251 is a high-speed 8-input digital multiplexer.
It provides, in one package, the ability to select one bit of
data from up to eight sources. It can be used as universal
function generator to generate any logic function of four vari-
ables. Both true and complementary outputs are provided.
Features
n I
CC
reduced by 50%
n Multifunctional capability
n On-chip select logic decoding
n Inverting and noninverting TRI-STATE outputs
n Outputs source/sink 24 mA
n ’ACT251 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC251: 5962-87692
— ’ACT251: 5962-89599
Logic Symbols
Pin Names Description
S
0
–S
2
Select Inputs
OE TRI-STATE Output Enable Input
I
0
–I
7
Multiplexer Inputs
Z TRI-STATE Multiplexer Output
Z Complementary TRI-STATE Multiplexer
Output
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
DS100284-1
IEEE/IEC
DS100284-2
August 1998
54AC251
•
54ACT251
8-Input
Multiplexer
with
TRI-ST
A
T
E
Output
© 1998 National Semiconductor Corporation DS100284 www.national.com