SN74HC21-Q1

DUAL 4-INPUT POSITIVE-AND GATE

SCLS597A − NOVEMBER 2004 − REVISED APRIL 2008

1

POST OFFICE BOX 655303

CC

description/ordering information

This

device

contains

two

independent

4-input

AND

gates.

It

performs

the

Boolean

function

Y

+ A • B • C • Dor Y + A ) B ) C ) D in positive logic.

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

40

°C to 125°C

SOIC − D

Reel of 2500

SN74HC21QDRQ1

HC21Q

−40

°C to 125°C

TSSOP − PW

Reel of 2000

SN74HC21QPWRQ1

HC21Q

document, or see the TI web site at http://www.ti.com.

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

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1A

1B

NC

1C

1D

1Y

GND

2D

2C

NC

2B

2A

2Y

D OR PW PACKAGE

(TOP VIEW)

Copyright

 2008, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.