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74F157A
Quad 2-Input Multiplexer
General Description
The F157A is a high- speed quad 2-input mul tiplexer. Four
bits of data from two sources can be selected using the
common Select and Enable inputs. The four outputs
present the selected data in the true (non-inverted) form.
The F157A can also be used to generate any four of the 16
different functions to two variables.
Ordering Code:
Order Number Package Number Package Description
74F157ASC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74F157ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F157APC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
74F157A Quad 2-Input Multiplexer
April 1988
Revised September 2000
Logic Symbols
Connection Diagram
IEEE/IEC
© 2000 Fairchild Semiconductor Corporation DS009483 www.fairchildsemi.com
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Unit Loading/Fan Out
74F157A
Pin Names Description
I0a–I
0d
I
1a–I1d
E
S Select Input 1.0/1.0 20
Z
a–Zd
U.L.
HIGH/LOW
Source 0 Data Inputs 1.0/1.0 20 µA/−0.6 mA
Source 1 Data Inputs 1.0/1.0 20 µA/−0.6 mA
Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA
Outputs 50/33.3 −1 mA/20 mA
Input I
Output I
µA/−0.6 mA
IH/IIL
OH/IOL
Truth Table
Inputs Output
E
HXXX L
LHXL L
LHXH H
LLLX L
LLHX H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
S
I
0
I
1
Logic Diagram
Functional Description
The F157A is a quad 2-input mul tipl e xer. It selects four bits
of data from two sources under the contr ol of a common
Z
Select input (S). The Enable input (E
E
is HIGH, all of the outputs (Z) are forced LOW regardless
of all other inputs. The F157A is the logic implementation of
a 4-pole, 2-position swit ch whe re the po sition of th e switch
is determined by the logic levels supplied to the Select
input. The logic equations for the outputs are shown below:
Z
= E • (I1nS + I0n S)
A common use of the F157A is the moving of data from two
groups of registers to four common output busses. The
particular register from which the data comes is determined
by the state of t he S elect in put . A less obvi ous us e is as a
function generator. The F1 57A can generate any four of
the 16 different functions of two vari a bles wi th one var iable
common. This is usef ul for implementing highly irregular
logic.
n
) is active LOW. When
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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Absolute Maximum Ratings(Note 1) Recommended Operating
Storage Temperature −65°C to +150°C
Ambient Temperature under Bias
Junction Temperature under Bias
Pin Potential to Ground Pin −0.5V to +7.0V
V
CC
Input Voltage (Note 2)
Input Current (Note 2)
−55°C to +125°C
−55°C to +150°C
−0.5V to +7.0V
−30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with V
Standard Output
CC
= 0V)
−0.5V to V
3-STATE Output −0.5V to +5.5V
Current Applied to Output
in LOW State (Max) twice the rated I
OL
ESD Last Passing Voltage (Min) 4000V
Conditions
Free Air Ambient Temperature 0
Supply Voltage
Note 1: Absolute maximum ratings are values beyond which the device
CC
may be damaged or have its useful life impaired . Functional operation
under these conditions is not implied.
Note 2: Either voltage lim it or c urrent limit is sufficient to protect inputs.
(mA)
DC Electrical Characteristics
Symbol Parameter Min Typ Max Units
V
V
V
V
V
I
IH
I
BVI
I
CEX
V
I
OD
I
IL
I
OS
I
CCH
I
CCL
IH
IL
CD
OH
OL
ID
Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
Input LOW Voltage 0.8 V Recognized as a LOW Signal
Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA
Output HIGH 10% V
Voltage 5% V
Output LOW Voltage 10% V
Input HIGH
Current
Input HIGH Current
Breakdown Te st
Output HIGH
Leakage Current
Input Leakage
Test All Other Pins Grounded
Output Leakage
Circuit Current All Other Pins Grounded
Input LOW Current −0.6 mA Max VIN = 0.5V
Output Short-Circuit Current −60 −150 mA Max V
Power Supply Current 15 23 mA Max VO = HIGH
Power Supply Current 15 23 mA Max VO = LOW
2.5
CC
2.7 IOH = −1 mA
CC
CC
4.75 V 0.0
0.5 V Min IOL = 20 mA
5.0 µAMaxVIN = 2.7V
7.0 µAMaxVIN = 7.0V
50 µAMaxV
3.75 µA0.0
V
CC
VMin
IOH = −1 mA
IID = 1.9 µA
V
OUT
IOD
OUT
+4.5V to +5.5V
Conditions
= V
CC
= 150 mV
= 0V
74F157A
°C to +70°C
AC Electrical Characteristics
Symbol Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay 4.0 7.0 10.0 4.0 12.0 4.0 11.0
S to Z
n
Propagation Delay 5.0 7.0 9.5 5.0 13.0 5.0 11.0
E to Z
n
Propagation Delay 2.5 4.5 6.0 2.5 7.5 2.5 6.5
In to Z
n
TA = +25°CT
VCC = +5.0V VCC = +5.0V VCC = +5.0V
CL = 50 pF CL = 50 pF CL = 50 pF
Min Typ Max Min Max Min Max
3.0 5.0 7.0 3.0 9.0 3.0 8.0
2.5 4.5 6.5 2.5 7.5 2.5 7.0
2.5 4.0 5.5 1.5 7.5 2.0 7.0
= −55°C to +125°CTA = 0°C to +70°C
A
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Units
ns
ns
ns
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Physical Dimensions inches (millimeters) unless otherwise noted
74F157A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
74F157A
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
74F157A Quad 2-Input Multiplexer
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Fairchild does not assume any responsibility for use of any circuitr y described, no circuit patent licenses are implied a nd
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 de vices o r systems a re devices or syste ms
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 reasonably expected to result in a significant inju ry to the
user.
Package Number N16E
2. A critical com ponent in any com ponen t of a life su pport
device or system whose failu re to perform can be reasonably expected to cause the failure of the li fe su pp ort
device or system, or to affect its safety or effectiveness.
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