HD74LS279

Rev.4.00, May 10, 2006, page 2 of 4

Function Table

Inputs

Output

S**

R

Q

H

H

L

H

H

H

L

L

L

L

H*

Notes: 1. H; high level, L; low level

3. *; This output level is psodo stable; that is it may not persist when

S and R inputs return to their inactive

(high) level.

4. **; For latches with double

S inputs; H; both S inputs high, L; one or both S inputs low.

Block Diagram (1/4)

R

Q

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