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MC74F158A QUAD 2-INPUT MULTIPLEXER
The MC74F158A is a high-speed quad 2-input multiplexer. It selects four bits of data from two sources using the common Select and Enable inputs. The four buffered outputs present the selected data in the inverted form. The F158A can also generate any four of the 16 different functions of two variables. * AC Enhanced Version of the F158 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
16
LOGIC DIAGRAM
I0a I1a I0b I1b I0c I1c I0d I1d E S
N SUFFIX PLASTIC CASE 648-08
1
16 1
D SUFFIX SOIC CASE 751B-03
ORDERING INFORMATION
MC74FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC
LOGIC SYMBOL
Za Zb Zc Zd 1
FUNCTION TABLE
Inputs E H L L L L S X L L H H I0 X L H X X I1 X X X L H Output Z H H L H L 9 VCC = PIN 16 GND = PIN 8 Zd 12 4 7 Za Zb Zc
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 4-69
MC74F158A
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 (Note 3) -60 10 -0.6 -150 15 V A A mA mA mA IOL = 20 mA VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VOUT = 0 V 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
VCC = MAX, VIN = HIGH
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. 3. ICC measured with outputs open and 4.5 V applied to all inputs.
AC CHARACTERISTICS
74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay S to Z Propagation Delay E to Zn Propagation Delay In to Z Parameter Min 3.0 2.5 2.5 2.0 2.0 1.0 Max 8.5 6.5 6.0 6.0 5.9 4.0 74F TA = 0C to 70C VCC = 5.0 V 10% CL = 50 pF Min 3.0 2.5 2.5 2.0 2.0 1.0 Max 9.5 7.0 7.0 6.5 7.0 4.5 ns ns Unit ns
FUNCTIONAL DESCRIPTION The F158A quad 2-input multiplexer selects four bits of data from two sources under the control of a common Select 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 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 F158A can generate four functions of two variables with one variable in common. This is useful for implementing gating functions.
FAST AND LS TTL DATA 4-70

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