SN54HC21, SN74HC21

DUAL 4-INPUT POSITIVE-AND GATES

SCLS087E – DECEMBER 1982 – REVISED AUGUST 2003

3

POST OFFICE BOX 655303

recommended operating conditions (see Note 3)

SN54HC21

SN74HC21

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

2

5

6

2

5

6

V

V

High-level input voltage

VCC = 2 V

1.5

1.5

V

VIH

High-level input voltage

VCC = 4.5 V

3.15

3.15

V

IH

VCC = 6 V

4.2

4.2

V

Low-level input voltage

VCC = 2 V

0.5

0.5

V

VIL

Low-level input voltage

VCC = 4.5 V

1.35

1.35

V

IL

VCC = 6 V

1.8

1.8

VI

Input voltage

0

VCC

0

VCC

V

VO

Output voltage

0

VCC

0

VCC

V

t/ v

Input transition rise/fall time

VCC = 2 V

1000

1000

ns

∆t/∆v

Input transition rise/fall time

VCC = 4.5 V

500

500

ns

VCC = 6 V

400

400

TA

Operating free-air temperature

–55

125

–40

85

°C

NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

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

V

V = V

or V

I

= –20 A

2 V

1.9

1.998

1.9

1.9

V

V

V = V

or V

IOH = –20 µA

4.5 V

4.4

4.499

4.4

4.4

V

VOH

VI = VIH or VIL

OH

6 V

5.9

5.999

5.9

5.9

V

OH

IIH

IL

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

V

V = V

or V

I

= 20 A

2 V

0.002

0.1

0.1

0.1

V

V

V = V

or V

IOL = 20 µA

4.5 V

0.001

0.1

0.1

0.1

V

VOL

VI = VIH or VIL

OL

6 V

0.001

0.1

0.1

0.1

V

OL

IIH

IL

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