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MC74F157A QUAD 2-INPUT MULTIPLEXER
The MC74F157A 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 buffered 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. * AC Enhanced Version of the F157 CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 E 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9 J SUFFIX CERAMIC CASE 620-09
16 1
QUAD 2-INPUT MULTIPLEXER
FASTTM SHOTTKY TTL
1 S
2 I0a
3 I1a
4 Za
5 I0b
6 I1b
7 Zb
8 GND N SUFFIX PLASTIC CASE 648-08
1
LOGIC DIAGRAM
I0a I1a I0b I1b I0c I1c I0d I1d E S
16
16 1
D SUFFIX SOIC CASE 751B-03
ORDERING INFORMATION
MC74FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC
Za
Zb
Zc
Zd
LOGIC SYMBOL
1
FUNCTION TABLE
Inputs E H L L L L S X H H L L I0 X X X L H I1 X L H X X Output Z L L H L H 9 VCC = PIN 16 GND = PIN 8 Zd 12 Zc 7 4 Za Zb
S E I0a I1a I0b I1b I0c I1c I0d I1d 15 2 3 5 6 14 13 11 10
H = HIGH Voltage Level; L = LOW Voltage Level; X = Don't Care
FAST AND LS TTL DATA 4-67
MC74F157A
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 74 74 74 74 Min 4.5 0 Typ 5.0 25 Max 5.5 70 -1.0 20 Unit V C mA mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH VOL IIH IIL IOS ICC Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 74 74 Output LOW Voltage Input HIGH Current 2.7 2.5 0.35 0.5 20 100 Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current -60 15 -0.6 -150 23 V A A mA mA mA IOL = 20 mA VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VOUT = 0 V All Inputs = 4.5 V VCC = MAX VCC = MAX VCC = MAX 3.4 Min 2.0 0.8 -1.2 Typ Max Unit V V V V Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = -18 mA IOH = -1.0 mA VCC = MIN VCC = 4.75 V VCC = 4.50 V VCC = MIN VCC = MAX
NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay S to Zn Propagation Delay E to Zn Propagation Delay In to Zn Parameter Min 3.5 3.0 3.5 2.5 2.0 2.5 Max 10 7.0 9.5 6.5 6.0 5.5 74F TA = 0C to 70C VCC = 5.0 V 10% CL = 50 pF Min 3.5 3.0 3.5 2.5 2.0 2.0 Max 11 8.0 11 7.0 6.5 7.0 ns ns Unit ns
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: Za = E * (I1a * S + I0a * S) Zc = E * (I1c * S + I0c * 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. Zb = E * (I1b * S + I0b * S) Zd = E * (I1d * S + I0d * S)
FAST AND LS TTL DATA 4-68

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