THERMAL METRIC(1)

SN74HC21

UNIT

N (PDIP)

D (SOIC)

PW (TSSOP)

NS (SOP)

14 PINS

14 PINS

14 PINS

14 PINS

RθJC(bot)

Junction-to-case (bottom) thermal

resistance

N/A

N/A

N/A

N/A

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

6.4 Electrical Characteristics - 74

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

MIN

TYP

MAX

MIN

TYP

MAX

VOH

High-level

output voltage

VI = VIH

or VIL

IOH = –20 µA

2 V

1.9

1.998

1.9

V

4.5 V

4.4

4.499

4.4

6 V

5.9

5.999

5.9

IOH = –4 mA

4.5 V

3.98

4.3

3.84

IOH = –5.2 mA

6 V

5.48

5.8

5.34

VOL

Low-level output

voltage

VI = VIH

or VIL

IOL = 20 µA

2 V

0.002

0.1

0.1

V

4.5 V

0.001

0.1

0.1

6 V

0.001

0.1

0.1

IOL = 4 mA

4.5 V

0.17

0.26

0.33

IOL = 5.2 mA

6 V

0.15

0.26

0.33

II

Input leakage

current

VI = VCC or 0

6 V

±0.1

±100

±1000

nA

ICC

Supply current

VI = VCC

or 0

VI = VCC or 0

6 V

2

20

µA

Ci

Input

capacitance

2 V to 6 V

3

10

10

pF

6.5 Electrical Characteristics - 54

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

VOH

High-level

output voltage

VI = VIH or

VIL

IOH = –20

µA

2 V

1.9

1.998

1.9

1.9

V

4.5 V

4.4

4.499

4.4

4.4

6 V

5.9

5.999

5.9

5.9

IOH = –4

mA

4.5 V

3.98

4.3

3.84

3.7

IOH = –5.2

mA

6 V

5.48

5.8

5.34

5.2

VOL

Low-level output

voltage

VI = VIH or

VIL

IOL = 20

µA

2 V

0.002

0.1

0.1

0.1

V

4.5 V

0.001

0.1

0.1

0.1

6 V

0.001

0.1

0.1

0.1

IOL = 4 mA 4.5 V

0.17

0.26

0.33

0.4

IOL = 5.2

mA

6 V

0.15

0.26

0.33

0.4

II

Input leakage

current

VI = VCC or 0

6 V

±0.1

±1

±1

µA

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SN74HC21, SN54HC21

SCLS087F – DECEMBER 1982 – REVISED JUNE 2021

Copyright © 2021 Texas Instruments Incorporated

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