© 1999 Fairchild Semiconductor Corporation DS009930 www.fairchildsemi.com
November 1988
Revised November 1999
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74ACT158
Quad 2-Input Multiplexer
General Description
The ACT158 is a high-speed quad 2-input multiplexer. It
selects four bits of data from two sources using the com-
mon Select and Enable inputs. The four buffered outputs
present the selected data in the inverted form. The ACT158
can also be used as a function generator.
Features
a73 I
CC
reduced by 50%
a73 Outputs source/sink 24 mA
a73 TTL-compatible inputs

Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
IEE/IEC
Connection Diagram
Pin Descriptions
FACT is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74ACT158SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74ACT158PC M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT158MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT158SJ N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Pin Names Description
I
0a
–I
0d
Source 0 Data Inputs
I
1a
–I
1d
Source 1 Data Inputs
E Enable Input
S Select Input
Z
a
–Z
d
Inverted Outputs