5-427

FAST AND LS TTL DATA

QUAD 2-INPUT MULTIPLEXER

WITH 3-STATE OUTPUTS

The LSTTL / MSI SN54 / 74LS257B and the SN54 / 74LS258B are Quad

2-Input Multiplexers with 3-state outputs. Four bits of data from two sources

can be selected using a Common Data Select input. The four outputs present

the selected data in true (non-inverted) form. The outputs may be switched to

a high impedance state with a HIGH on the common Output Enable (EO) In-

put, allowing the outputs to interface directly with bus oriented systems. It is

fabricated with the Schottky barrier diode process for high speed and is com-

pletely compatible with all Motorola TTL families.

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

S

E0

I0c

I1c

Zc

I1d

I0d

Zd

I0a

I1a

Za

I0b

I1b

Zb GND

CONNECTION DIAGRAM DIP (TOP VIEW)

SN54/74LS257B

SN54/74LS258B

VCC = PIN 16

GND = PIN 8

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

S

E0

I0c

I1c

Zc

I1d

I0d

Zd

I0a

I1a

Za

I0b

I1b

Zb GND

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

SN54/74LS257B

SN54/74LS258B

QUAD 2-INPUT MULTIPLEXER

WITH 3-STATE OUTPUTS

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

16

1

D SUFFIX

SOIC

CASE 751B-03