HD74LS279FPEL Просмотр технического описания (PDF) - Renesas Electronics

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HD74LS279FPEL

Quadruple S-R Latches

Renesas Electronics 

HD74LS279

Function Table

Inputs

Output

S**

R

Q

H

H

Q0

L

H

H

H

L

L

L

L

H*

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

2. Q0; The level of Q before the indidicated input conditions were established.

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

S1

Q

S2

Absolute Maximum Ratings

Item

Symbol

Ratings

Supply voltage

VCC

7

Input voltage

VIN

7

Power dissipation

PT

400

Storage temperature

Tstg

–65 to +150

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

Recommended Operating Conditions

Item

Supply voltage

Output current

Operating temperature

Symbol

VCC

IOH

IOL

Topr

Min

4.75

—

—

–20

Typ

5.00

—

—

25

Max

5.25

–400

8

75

Unit

V

V

mW

°C

Unit

V

µA

mA

°C

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

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