HD74LS157

Rev.2.00, Feb.18.2005, page 2 of 6

Function Table

Inputs

Output

Strobe

Select

A

B

Y

H

X

X

X

L

L

L

L

X

L

L

L

H

X

H

L

H

X

L

L

L

H

X

H

H

H ; high level, L ; low level, X ; irrelevant

Block Diagram

Strobe G

Select S

Outputs

Data

Inputs

1A

1Y

4Y

3Y

2Y

1B

2A

2B

3A

3B

4A

4B

Absolute Maximum Ratings

Item

Symbol

Ratings

Unit

Supply voltage

7

V

Input voltage

7

V

Power dissipation

400

mW

Storage temperature

Tstg

–65 to +150

°C

Note:

Voltage value, unless otherwise noted, are with respect to network ground terminal.

Recommended Operating Conditions

Item

Symbol

Min

Typ

Max

Unit

Supply voltage

4.75

5.00

5.25

V

—

—

–400

µA

Output current

—

—

8

mA

Operating temperature

Topr

–20

25

75

°C