SN54HC21, SN74HC21

DUAL 4-INPUT POSITIVE-AND GATES

SCLS087C – DECEMBER 1982 – REVISED MAY 1997

3

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

SN54HC21

SN74HC21

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

1.9

1.998

1.9

1.9

IOH = –20 µA

4.5 V

4.4

4.499

4.4

4.4

VOH

VI = VIH or VIL

6 V

5.9

5.999

5.9

5.9

V

IOH = –4 mA

4.5 V

3.98

4.3

3.7

3.84

IOH = –5.2 mA

6 V

5.48

5.8

5.2

5.34

2 V

0.002

0.1

0.1

0.1

IOL = 20 µA

4.5 V

0.001

0.1

0.1

0.1

VOL

VI = VIH or VIL

6 V

0.001

0.1

0.1

0.1

V

IOL = 4 mA

4.5 V

0.17

0.26

0.4

0.33

IOL = 5.2 mA

6 V

0.15

0.26

0.4

0.33

II

VI = VCC or 0

6 V

±0.1

±100

±1000

±1000

nA

ICC

VI = VCC or 0,

IO = 0

6 V

2

40

20

µA

Ci

2 V to 6 V

3

10

10

10

pF

(unless otherwise noted) (see Figure 1)

PARAMETER

FROM

TO

VCC

TA = 25°C

SN54HC21

SN74HC21

UNIT

PARAMETER

(INPUT)

(OUTPUT)

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

44

110

165

140

tpd

A, B, C, or D

Y

4.5 V

14

22

33

28

ns

6 V

11

19

28

24

2 V

29

75

110

95

tt

Y

4.5 V

10

15

22

19

ns

6 V

8

13

19

16

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance per gate

No load

25

pF