SN54ALS874B, SN74ALS874B, SN74ALS876A

SN74AS874, SN74AS876

DUAL 4BIT DTYPE EDGETRIGGERED FLIPFLOPS

SDAS061C − APRIL 1982 − REVISED JANUARY 1995

4

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

recommended operating conditions

SN54ALS874B

SN74ALS874B

SN74ALS876A

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

−1

− 2.6

mA

IOL

Low-level output current

12

24

mA

fclock

Clock frequency

0

25

0

30

MHz

PRE or CLR low

15

10

tw

Pulse duration

CLK high

20

16.5

ns

tw

Pulse duration

CLK low

20

16.5

ns

tsu

Setup time before CLK

↑

Data

15

15

ns

tsu

Setup time before CLK

↑

PRE or CLR inactive

15

10

ns

th

Hold time, data after CLK

↑

4

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

SN54ALS874B

SN74ALS874B

SN74ALS876A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = − 18 mA

− 1.2

− 1.2

V

VCC = 4.5 V to 5.5 V,

IOH = − 0.4 mA

VCC −2

VCC −2

VOH

VCC = 4.5 V

IOH = − 1 mA

2.4

3.3

V

VOH

VCC = 4.5 V

IOH = − 2.6 mA

2.4

3.2

V

VOL

VCC = 4.5 V

IOL = 12 mA

0.25

0.4

0.25

0.4

V

VOL

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

IOZH

VCC = 5.5 V,

VO = 2.7 V

20

20

µA

IOZL

VCC = 5.5 V,

VO = 0.4 V

−20

−20

µA

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

IIL

VCC = 5.5 V,

VI = 0.4 V

− 0.2

− 0.2

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

−20

−112

−30

−112

mA

Outputs high

14

21

14

21

′ALS874B

VCC = 5.5 V

Outputs low

19

30

19

30

ICC

ALS874B

VCC = 5.5 V

Outputs disabled

20

32

20

32

mA

ICC

Outputs high

14

21

mA

SN74ALS876A

VCC = 5.5 V

Outputs low

18

29

SN74ALS876A

VCC = 5.5 V

Outputs disabled

20

31

† 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.