VI ± Input Voltage (V)

0

0.5

1

1.5

2

2.5

3

3.5

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

VCC = 2 V

VCC = 2.5 V

VCC = 3.3 V

VI ± Input Voltage (V)

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

VCC = 4.5 V

VCC = 5 V

VCC = 6 V

Output Sink Current (mA)

0

2.5

5

7.5

10

12.5

15

17.5

20

22.5

25

26

28

30

32

34

36

38

40

42

44

46

VCC = 2 V

VCC = 3.3 V

VCC = 4.5 V

VCC = 6 V

Output Source Current (mA)

0

2.5

5

7.5

10

12.5

15

17.5

20

22.5

25

30

35

40

45

50

55

60

65

70

VCC = 2 V

VCC = 3.3 V

VCC = 4.5 V

VCC = 6 V

5

SN74HCS21

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SCLS793A – MARCH 2020 – REVISED JUNE 2020

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Electrical Characteristics (continued)

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX UNIT

ICC

Supply current

VI = VCC or 0, IO = 0

6 V

0.1

2

µA

Ci

Input capacitance

2 V to 6 V

5

pF

Cpd

Power dissipation capacitance

per gate

No load

2 V to 6 V

10

pF

6.6 Switching Characteristics

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

Parameter Measurement Information.

PARAMETER

FROM (INPUT)

TO (OUTPUT)

VCC

MIN

TYP

MAX

UNIT

tpd

Propagation delay

A or B

Y

2 V

22

52

ns

4.5 V

9

22

6 V

8

16

tt

Transition-time

Y

2 V

9

17

ns

4.5 V

5

8

6 V

4

7

6.7 Typical Characteristics

TA = 25°C

Figure 1. Output driver resistance in Low state

Figure 2. Output driver resistance in High state

Figure 3. Typical supply current versus input voltage across

common supply values (2 V to 3.3 V)

Figure 4. Typical supply current versus input voltage across

common supply values (4.5 V to 6 V)