SN54HC21, SN74HC21

DUAL 4INPUT POSITIVEAND GATES

SCLS087E − DECEMBER 1982 − REVISED AUGUST 2003

2

POST OFFICE BOX 655303

FUNCTION TABLE

(each gate)

INPUTS

OUTPUT

A

B

C

D

OUTPUT

Y

H

H

H

H

H

L

XX

X

L

X

LX

X

L

X

XL

X

L

X

X

X

L

L

logic diagram (positive logic)

1A

1Y

1B

1C

1D

2A

2Y

2B

2C

2D

1

2

4

5

9

10

12

13

68

Pin numbers shown are for the D, J, N, NS, PW, and W packages.

−0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±20 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±20 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±25 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±50 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

86

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package

80

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NS package

76

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package

113

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

2. The package thermal impedance is calculated in accordance with JESD 51-7.