2000 Fairchild Semiconductor Corporation
DS006550
www.fairchildsemi.com
August 1986
Revised February 2000
DM74157
Quad 2-Li
ne to 1-Li
ne D
a
ta Select
ors
/
Mult
ip
lexer
DM74157
Quad 2-Line to 1-Line Data Selectors/Multiplexer
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four out-
put gates. A separate strobe input is provided. A 4-bit word
is selected from one of two sources and is routed to the
four outputs.
Applications
Expand any data input point
Multiplex dual data buses
Generate four functions of two variables (one variable is
common)
Source programmable counters
Features
s
Buffered inputs and outputs
s
Typical propagation time 9 ns
s
Typical power dissipation 150 mW
Ordering Code:
Connection Diagram
Function Table
H
=
HIGH Level, L
=
LOW Level, X
=
Don't Care
Logic Diagram
Order Number
Package Number
Package Description
DM74157N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Output Y
Strobe
Select
A
B
H
X
X
X
L
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
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2
DM74157
Absolute Maximum Ratings
(Note 1)
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at V
CC
=
5V, T
A
=
25
C.
Note 3: Not more than one output should be shorted at a time.
Note 4: I
CC
is measured with 4.5V applied to all inputs and all outputs OPEN.
Switching Characteristics
at V
CC
=
5V and T
A
=
25
C
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range
-
65
C to
+
150
C
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
I
OH
HIGH Level Output Current
-
0.8
mA
I
OL
LOW Level Output Current
16
mA
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
12 mA
-
1.5
V
V
OH
HIGH Level
V
CC
=
Min, I
OH
=
Max
2.4
3.4
V
Output Voltage
V
IL
=
Max, V
IH
=
Min
V
OL
LOW
Level V
CC
=
Min, I
OL
=
Max
0.4
V
Output Voltage
V
IH
=
Min, V
IL
=
Max
I
I
Input Current @ Max Input Voltage
V
CC
=
Max, V
I
=
5.5V
1
mA
I
IH
HIGH Level Input Current
V
CC
=
Max, V
I
=
2.4V
40
A
I
IL
LOW Level Input Current
V
CC
=
Max, V
I
=
0.4V
-
1.6
mA
I
OS
Short Circuit Output Current
V
CC
=
Max (Note 3)
-
18
-
55
mA
I
CC
Supply Current
V
CC
=
Max (Note 4)
30
48
mA
Symbol
Parameter
From (Input)
R
L
=
400
, C
L
=
15 pF
Units
To (Output)
Min
Max
t
PLH
Propagation Delay Time
Data to Y
14
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Data to Y
14
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Strobe to Y
20
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Strobe to Y
21
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Select to Y
23
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Select to Y
27
ns
HIGH-to-LOW Level Output
3
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DM74157
Quad 2-Li
ne to 1-Li
ne D
a
ta Select
ors
/
Mult
ip
lexer
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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