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74F157APC

P1-P3P4-P6
© 2000 Fairchild Semiconductor Corporation DS009483 www.fairchildsemi.com
April 1988
Revised September 2000
74F157A Quad 2-Input Multiplexer
74F157A
Quad 2-Input Multiplexer
General Description
The F157A is a high-speed quad 2-input multiplexer. 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:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
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
www.fairchildsemi.com 2
74F157A
Unit Loading/Fan Out
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Functional Description
The F157A is a quad 2-input multiplexer. It selects four bits
of data from two sources under the control of a common
Select input (S). The Enable input (E
) is active LOW. When
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 switch where the position of the switch
is determined by the logic levels supplied to the Select
input. The logic equations for the outputs are shown below:
Z
n
= E • (I
1n
S + I
0n
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 the Select input. A less obvious use is as a
function generator. The F157A can generate any four of
the 16 different functions of two variables with one variable
common. This is useful for implementing highly irregular
logic.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Pin Names Description
U.L.
Input I
IH
/I
IL
HIGH/LOW
Output I
OH
/I
OL
I
0a
–I
0d
Source 0 Data Inputs 1.0/1.0 20 µA/−0.6 mA
I
1a
–I
1d
Source 1 Data Inputs 1.0/1.0 20 µA/−0.6 mA
E
Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA
S Select Input 1.0/1.0 20
µA/−0.6 mA
Z
a
–Z
d
Outputs 50/33.3 −1 mA/20 mA
Inputs Output
E
S
I
0
I
1
Z
HXXX L
LHXL L
LHXH H
LLLX L
LLHX H
3 www.fairchildsemi.com
74F157A
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
AC Electrical Characteristics
Storage Temperature −65°C to +150°C
Ambient Temperature under Bias
−55°C to +125°C
Junction Temperature under Bias
−55°C to +150°C
V
CC
Pin Potential to Ground Pin −0.5V to +7.0V
Input Voltage (Note 2)
−0.5V to +7.0V
Input Current (Note 2)
−30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with V
CC
= 0V)
Standard Output
−0.5V to V
CC
3-STATE Output −0.5V to +5.5V
Current Applied to Output
in LOW State (Max) twice the rated I
OL
(mA)
ESD Last Passing Voltage (Min) 4000V
Free Air Ambient Temperature 0
°C to +70°C
Supply Voltage
+4.5V to +5.5V
Symbol Parameter Min Typ Max Units
V
CC
Conditions
V
IH
Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
V
IL
Input LOW Voltage 0.8 V Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage −1.2 V Min I
IN
= −18 mA
V
OH
Output HIGH 10% V
CC
2.5
VMin
I
OH
= −1 mA
Voltage 5% V
CC
2.7 I
OH
= −1 mA
V
OL
Output LOW Voltage 10% V
CC
0.5 V Min I
OL
= 20 mA
I
IH
Input HIGH
5.0 µAMaxV
IN
= 2.7V
Current
I
BVI
Input HIGH Current
7.0 µAMaxV
IN
= 7.0V
Breakdown Test
I
CEX
Output HIGH
50 µAMaxV
OUT
= V
CC
Leakage Current
V
ID
Input Leakage
4.75 V 0.0
I
ID
= 1.9 µA
Test All Other Pins Grounded
I
OD
Output Leakage
3.75 µA0.0
V
IOD
= 150 mV
Circuit Current All Other Pins Grounded
I
IL
Input LOW Current −0.6 mA Max V
IN
= 0.5V
I
OS
Output Short-Circuit Current −60 −150 mA Max V
OUT
= 0V
I
CCH
Power Supply Current 15 23 mA Max V
O
= HIGH
I
CCL
Power Supply Current 15 23 mA Max V
O
= LOW
Symbol Parameter
T
A
= +25°CT
A
= −55°C to +125°CT
A
= 0°C to +70°C
Units
V
CC
= +5.0V V
CC
= +5.0V V
CC
= +5.0V
C
L
= 50 pF C
L
= 50 pF C
L
= 50 pF
Min Typ Max Min Max Min Max
t
PLH
Propagation Delay 4.0 7.0 10.0 4.0 12.0 4.0 11.0
ns
t
PHL
S to Z
n
3.0 5.0 7.0 3.0 9.0 3.0 8.0
t
PLH
Propagation Delay 5.0 7.0 9.5 5.0 13.0 5.0 11.0
ns
t
PHL
E to Z
n
2.5 4.5 6.5 2.5 7.5 2.5 7.0
t
PLH
Propagation Delay 2.5 4.5 6.0 2.5 7.5 2.5 6.5
ns
t
PHL
I
n
to Z
n
2.5 4.0 5.5 1.5 7.5 2.0 7.0
P1-P3P4-P6

74F157APC

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Manufacturer:
ON Semiconductor / Fairchild
Description:
Encoders, Decoders, Multiplexers & Demultiplexers Qd 2-Inp Multiplexer
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