SN54F521, SN74F521

8-BIT IDENTITY COMPARATORS

SDFS091 – MARCH 1987 – REVISED OCTOBER 1993

Copyright

2–1

POST OFFICE BOX 655303

Small-Outline Packages, Ceramic Chip

Carriers, and Standard Plastic and Ceramic

300-mil DIPs

description

These identity comparators perform comparisons

on two 8-bit binary or BCD words. They provide

P = Q outputs.

The SN54F521 is characterized for operation over

the full military temperature range of – 55

°C to

125

°C. The SN74F521 is characterized for

operation from 0

°C to 70°C.

FUNCTION TABLE

INPUTS

OUTPUT

P, Q

OE

P = Q

P = Q

L

L

P

≠ Q

XH

X

H

H

COMP

0

2

P0

4

P1

6

P2

8

P3

1

19

1P = Q

11

P4

13

P5

15

P6

7

17

P7

0

3

Q0

5

Q1

7

Q2

9

Q3

12

Q4

14

Q5

16

Q6

7

18

Q7

P

Q

OE

P = Q

† This symbol is in accordance with ANSI/IEEE Std 91-1984 and

IEC Publication 617-12.

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

OE

P0

Q0

P1

Q1

P2

Q2

P3

Q3

GND

P = Q

Q7

P7

Q6

P6

Q5

P5

Q4

P4

SN54F521 ...J PACKAGE

SN74F521 . . . DW OR N PACKAGE

(TOP VIEW)

3

2

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

Q7

P7

Q6

P6

Q5

P1

Q1

P2

Q2

P3

SN54F521 . . . FK PACKAGE

(TOP VIEW)

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.