SN54ALS74A, SN54AS74A, SN74ALS74A, SN74AS74A

DUAL POSITIVEEDGETRIGGERED DTYPE FLIPFLOPS

WITH CLEAR AND PRESET

SDAS143C − APRIL 1982 − REVISED AUGUST 1995

3

POST OFFICE BOX 655303

POST OFFICE BOX 1443

recommended operating conditions

SN54ALS74A

SN74ALS74A

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

0.7

0.8

V

IOH

High-level output current

− 0.4

− 0.4

mA

IOL

Low-level output current

4

8

mA

fclock

Clock frequency

0

25

0

34

MHz

PRE or CLR low

15

15

tw

Pulse duration

CLK high

17.5

14.5

ns

tw

Pulse duration

CLK low

17.5

14.5

ns

tsu

Setup time before CLK

↑

Data

16

15

ns

tsu

Setup time before CLK

↑

PRE or CLR inactive

10

10

ns

th

Hold time after CLK

↑

Data

2

0

ns

TA

Operating free-air temperature

−55

125

0

70

°C

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS74A

SN74ALS74A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = −18 mA

−1.5

−1.5

V

VOH

VCC = 4.5 V to 5.5 V,

IOH = − 2 mA

VCC −2

VCC −2

V

VOL

VCC = 4.5 V

IOL = 4 mA

0.25

0.4

0.25

0.4

V

VOL

VCC = 4.5 V

IOL = 8 mA

0.35

0.5

V

II

CLK or D

VCC = 4.5 V,

VI = 7 V

0.1

0.1

mA

II

PRE or CLR

VCC = 4.5 V,

VI = 7 V

0.2

0.2

mA

IIH

CLK or D

VCC = 4.5 V,

VI = 2.7 V

20

20

A

IIH

PRE or CLR

VCC = 4.5 V,

VI = 2.7 V

40

40

µA

IIL

CLK or D

VCC = 4.5 V,

VI = 0.4 V

− 0.2

− 0.2

mA

IIL

PRE or CLR

VCC = 4.5 V,

VI = 0.4 V

− 0.4

− 0.4

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

−20

−112

−30

−112

mA

ICC

VCC = 5.5 V,

See Note 1

2.4

4

2.4

4

mA

† All typical values are at VCC = 5 V, TA = 25°C.

‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

NOTE 1: ICC is measured with D, CLK, and PRE grounded, then with D, CLK, and CLR grounded.