over operating free-air temperature range; typical values measured at TA = 25°C (unless otherwise noted).

PARAMETER

TEST CONDITIONS

VCC

Operating free-air temperature (TA)

UNIT

25°C

–40°C to 85°C

–55°C to 125°C

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

ICC Supply current

VI = VCC or

0

IO = 0

6 V

2

20

40

µA

Ci

Input

capacitance

2 V to

6 V

3

10

10

10

pF

6.6 Switching Characteristics - 74

over operating free-air temperature range (unless otherwise noted)

PARAMETER

FROM

TO

VCC

Operating free-air temperature (TA)

UNIT

25°C

–40°C to 85°C

MIN

TYP

MAX

MIN

TYP

MAX

tpd

Propagation delay

A, B, C, or

D

Y

2 V

44

110

140

ns

4.5 V

14

22

28

6 V

11

19

24

tt

Transition-time

Y

2 V

29

75

95

ns

4.5 V

10

15

19

6 V

8

13

16

6.7 Switching Characteristics - 54

over operating free-air temperature range; typical values measured at TA = 25°C (unless otherwise noted).

PARAMETER

FROM

TO

TEST

CONDITIO

NS

VCC

Operating free-air temperature (TA)

UNIT

25°C

–40°C to 85°C

–55°C to 125°C

MIN TYP MAX

MIN TYP MAX

MIN TYP MAX

tpd

Propagation delay

A, B, C,

or D

Y

CL = 50 pF

2 V

44

110

140

165

ns

4.5 V

14

22

28

33

6 V

11

19

24

28

tt

Transition-time

Y

CL = 50 pF

2 V

29

75

95

110

ns

4.5 V

10

15

19

22

6 V

8

13

16

19

6.8 Operating Characteristics

over operating free-air temperature range; typical values measured at TA = 25°C (unless otherwise noted).

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX UNIT

Cpd

Power dissipation capacitance

per gate

No load

2 V to 6 V

25

pF

6.9 Typical Characteristics

TA = 25°C

SN74HC21, SN54HC21

SCLS087F – DECEMBER 1982 – REVISED JUNE 2021

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