Philips Semiconductors

Product specification

74ALS74A

Dual D-type flip-flop with set and reset

1996 Jul 01

3

LOGIC DIAGRAM

GND = Pin 7

5, 9

6, 8

Q

Q

4, 10

1, 13

3, 11

2, 12

SD

RD

CP

D

SF00048

FUNCTION TABLE

INPUTS

OUTPUTS

OPERATING

SD

RD

CP

D

Q

Q

MODE

L

H

X

X

H

L

Asynchronous set

H

L

X

X

L

H

Asynchronous reset

L

L

X

X

H

H

Undetermined*

H

H

↑

h

H

L

Load “1”

H

H

↑

l

L

H

Load “0”

H

H

↑

X

NC

NC

Hold

H = High voltage level

h

= High state must be present one setup time prior to

Low-to-High clock transition

L

= Low voltage level

l

= Low state must be present one setup time prior to

Low-to-High clock transition

NC= No change from the previous setup

X = Don’t care

↑ = Low-to-High clock transition

↑ = Not Low-to-High clock transition

*

= Both outputs will be High while both SD and RD are Low,

but the output states are unpredictable if SD and RD go

High simultaneously

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device.

Unless otherwise noted these limits are over the operating free-air temperature range.)

SYMBOL

PARAMETER

RATING

UNIT

Supply voltage

–0.5 to +7.0

V

Input voltage

–0.5 to +7.0

V

Input current

–30 to +5

mA

Voltage applied to output in High output state

V

Current applied to output in Low output state

16

mA

Operating free-air temperature range

0 to +70

°C

Storage temperature range

–65 to +150

°C

RECOMMENDED OPERATING CONDITIONS

SYMBOL

PARAMETER

LIMITS

UNIT

SYMBOL

PARAMETER

MIN

NOM

MAX

UNIT

Supply voltage

4.5

5.0

5.5

V

High-level input voltage

2.0

V

Low-level input voltage

0.8

V

Input clamp current

–18

mA

High-level output current

–0.4

mA

Low-level output current

8

mA

Operating free-air temperature range

0

+70

°C