5-268

FAST AND LS TTL DATA

QUAD 2-INPUT MULTIPLEXER

The LSTTL / MSI SN54 / 74LS157 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 LS157 can also be used to generate any four

of the 16 different functions of two variables. The LS157 is fabricated with the

Schottky barrier diode process for high speed and is completely compatible

with all Motorola TTL families.

CONNECTION DIAGRAM DIP (TOP VIEW)

NOTE:

The Flatpak version has

the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

S

E

I0c

I1c

Zc

I1d

I0d

Zd

I0a

I1d

Za

I0b

I1b

Zb GND

PIN NAMES

LOADING (Note a)

HIGH

LOW

S

E

I0a – I0d

I1a – I1d

Za – Zd

Common Select Input

Enable (Active LOW) Input

Data Inputs from Source 0

Data Inputs from Source 1

Multiplexer Outputs (Note b)

1.0 U.L.

1.0 U.L.

0.5 U.L.

0.5 U.L.

10 U.L.

0.5 U.L.

0.5 U.L.

0.25 U.L.

0.25 U.L.

5 (2.5) U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

Temperature Ranges.

LOGIC DIAGRAM

I0a

I1a

I0b

I1b

I0c

I1c

I0d

I1d E S

Za

Zb

Zc

Zd

14

1

2

6

7

3

4

5

9

11

12

10

13

15

VCC = PIN 16

GND = PIN 8

= PIN NUMBERS

SN54/74LS157

QUAD 2-INPUT MULTIPLEXER

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

VCC = PIN 16

GND = PIN 8

15 2 3 5 6 14 13 11 10

1

4

7

12

9

E I0a I1a I0b I1b I0c I1c I0d I1d

Za

Zb

Zc

Zd

S