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SN74LS151 8-Input Multiplexer
The TTL / MSI SN74LS151 is a high speed 8-input Digital Multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. The LS151 can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided.

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SchottkyProcess for High Speed Multifunction Capability On-Chip Select Logic Decoding Fully Buffered Complementary Outputs Input Clamp Diodes Limit High Speed Termination Effects

LOW POWER SCHOTTKY

GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current – High Output Current – Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 – 0.4 8.0 Unit V °CmA mA
16 1

PLASTIC N SUFFIX CASE 648

16 1

SOIC D SUFFIX CASE 751B

ORDERING INFORMATION
Device SN74LS151N SN74LS151D Package 16 Pin DIP 16 Pin Shipping 2000 Units/Box 2500/Tape & Reel

© Semiconductor Components Industries, LLC, 1999

1

December, 1999 – Rev. 6

Publication Order Number: SN74LS151/D

SN74LS151
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 I4 15 I5 14 I6 13 I712 S0 11 S1 10 S2 9

1 I3

2 I2

3 I1

4 I0

5 Z

6 Z

7 E

8 GND

LOADING (Note a) PIN NAMES S0 – S2 E I0 – I7 Z Z Select Inputs Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output Complementary Multiplexer Output HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 10 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 5 U.L. 5 U.L.

NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mALOW. b) The Output LOW drive factor is 5 U.L. for Commercial (74) Temperature Ranges.

LOGIC SYMBOL

7 4 3 2 1 15 14 13 12 E I0 I1 I2 I3 I4 I5 I6 I7 S0 S1 S2 Z Z 6 5

11 10 9

VCC = PIN 16 GND = PIN 8

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SN74LS151
LOGIC DIAGRAM
I0 S2 S1
11 9 10 4

I1
3

I2
2

I3
1

I4
15

I5
14

I6
13

I7
12

S0
7

E

VCC = PIN 16 GND = PIN 8 = PINNUMBERS

6

5

Z

Z

FUNCTIONAL DESCRIPTION

The LS151 is a logical implementation of a single pole, 8-position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2. Both assertion and negation outputs are provided. The Enable input (E) is active LOW. When it is not activated, the negation output is HIGH and the assertion output is LOW regardless ofall other inputs. The logic function provided at the output is:

Z = E ⋅ (I0 ⋅ S0 ⋅ S1 ⋅ S2 + ⋅ I1 ⋅ S0 ⋅ S1 ⋅ S2 + I2 ⋅ S0 ⋅ S1 ⋅ S2 + I3 ⋅ S0 ⋅ S1 ⋅ S2 + I4 ⋅ S0 ⋅ S1 ⋅ S2 + I5 ⋅ S0 ⋅ S1 ⋅ S2 + I6 ⋅ S0 ⋅ S1 ⋅ S2 + I7 ⋅ S0 ⋅ S1 ⋅ S2).

The LS151 provides the ability, in one package, to select from eight sources of data or control information. By proper manipulation of the inputs, the LS151 canprovide any logic function of four variables and its negation.

TRUTH TABLE
E H L L L L L L L L L L L L L L L L S2 X L L L L L L L L H H H H H H H H S1 X L L L L H H H H L L L L H H H H S0 X L L H H L L H H L L H H L L H H I0 X L H X X X X X X X X X X X X X X I1 X X X L H X X X X X X X X X X X X I2 X X X X X L H X X X X X X X X X X I3 X X X X X X X L H X X X X X X X X I4 X X X X X X X X X L H XX X X X X I5 X X X X X X X X X X X L H X X X X I6 X X X X X X X X X X X X X L H X X I7 X X X X X X X X X X X X X X X L H Z H H L H L H L H L H L H L H L H L Z L L H L H L H L H L H L H L H L H

H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care

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SN74LS151
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VILVIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.7 – 0.65 3.5 0.25 VO OL Output LOW Voltage 0.35 IIH IIL IOS ICC Input HIGH Current Input LOW Current Short Circuit Current (Note 1) Power Supply Current – 20 0.5 20 0.1 – 0.4 – 100 10 V µA mA mA mA mA 0.4 Min 2.0 0.8 – 1.5 Typ Max Unit V V V V V Test Conditions Guaranteed Input HIGH Voltage for...