SN54ALS74A, SN54AS74A, SN74ALS74A, SN74AS74A

DUAL POSITIVEEDGETRIGGERED DTYPE FLIPFLOPS

WITH CLEAR AND PRESET

SDAS143C − APRIL 1982 − REVISED AUGUST 1995

4

POST OFFICE BOX 655303

POST OFFICE BOX 1443

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

TA = MIN to MAX†

UNIT

PARAMETER

(INPUT)

(OUTPUT)

SN54ALS74A

SN74ALS74A

UNIT

MIN

MAX

MIN

MAX

fmax

25

34

MHz

tPLH

PRE or CLR

Q or Q

3

18

3

13

ns

tPHL

PRE or CLR

Q or Q

5

17

5

15

ns

tPLH

CLK

Q or Q

5

23

5

16

ns

tPHL

CLK

Q or Q

5

20

5

18

ns

† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−55

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74AS74A

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

recommended operating conditions

SN54AS74A

SN74AS74A

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

IOH

High-level output current

−2

−2

mA

IOL

Low-level output current

20

20

mA

fclock*

Clock frequency

0

90

0

105

MHz

PRE or CLR low

4

4

tw*

Pulse duration

CLK high

4

4

ns

tw*

Pulse duration

CLK low

5.5

5.5

ns

tsu*

Setup time before CLK

↑

Data

4.5

4.5

ns

tsu*

Setup time before CLK

↑

PRE or CLR inactive

2

2

ns

th*

Hold time after CLK

↑

Data

0

0

ns

TA

Operating free-air temperature

−55

125

0

70

°C

* On products compliant to MIL-STD-833, Class B, this parameter is based on characterization data but is not production tested.