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National Semiconductor Electronic Components Datasheet


74F158ASC

Quad 2-Input Multiplexer


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74F158ASC pdf
November 1994
54F 74F158A
Quad 2-Input Multiplexer
General Description
The ’F158A is a high speed quad 2-input multiplexer It se-
lects four bits of data from two sources using the common
Select and Enable inputs The four outputs present the se-
lected data in the inverted form The ’F158A can also gener-
ate any four of the 16 different functions of two variables
Features
Y Guaranteed 4000V minimum ESD protection
Commercial
Military
Package
Number
Package Description
74F158APC
N16E
16-Lead (0 300 Wide) Molded Dual-In-Line
54F158ADM (Note 2) J16A
16-Lead Ceramic Dual-In-Line
74F158ASC (Note 1)
M16A
16-Lead (0 150 Wide) Molded Small Outline JEDEC
74F158ASJ (Note 1)
M16D
16-Lead (0 300 Wide) Molded Small Outline EIAJ
54F158AFM (Note 2) W16A
16-Lead Cerpack
54F158ALM (Note 2) E20A
20-Lead Ceramic Leadless Chip Carrier Type C
Note 1 Devices also available in 13 reel Use suffix e SCX and SJX
Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB
Logic Symbols
Connection Diagrams
Pin Assignment for
DIP SOIC and Flatpak
Pin Assignment
for LCC
IEEE IEC
TL F 9484–3
TL F 9484 – 1
TL F 9484 – 2
TL F 9484–5
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9484
RRD-B30M75 Printed in U S A



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74F158ASC pdf
Unit Loading Fan Out
Pin Names
Description
I0a – I0d
I1a – I1d
E
S
Za – Zd
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input (Active LOW)
Select Input
Inverted Outputs
54F 74F
UL
HIGH LOW
10 10
10 10
10 10
10 10
50 33 3
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
b1 mA 20 mA
Functional Description
The ’F158A quad 2-input multiplexer selects four bits of
data from two sources under the control of a common Se-
lect input (S) and presents the data in inverted form at the
four outputs The Enable input (E) is active LOW When E is
HIGH all of the outputs (Z) are forced HIGH regardless of
all other inputs The ’F158A is the logic implementation of a
4-pole 2-position switch where the position of the switch is
determined by the logic levels supplied to the Select input
A common use of the ’F158A is the moving of data from two
groups of registers to four common output busses The par-
ticular register from which the data comes is determined by
the state of the Select input A less obvious use is as a
function generator The ’F158A can generate four functions
of two variables with one variable common This is useful for
implementing gating functions
Logic Diagram
Truth Table
Inputs
E S I0
HX X
LLL
LLH
LHX
LHX
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Zn e E c (I1n S a I0n S)
I1
X
X
X
L
H
Outputs
Z
H
H
L
H
L
TL F 9484 – 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2



Part Number 74F158ASC
Description Quad 2-Input Multiplexer
Maker National Semiconductor - National Semiconductor
Total Page 8 Pages
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