SN54F27, SN74F27

TRIPLE 3-INPUT POSITIVE-NOR GATES

SDFS042A – 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 devices contain three independent 3-input

NOR gates. They perform the Boolean functions

Y = A

• B • C or Y = A + B + C in positive logic.

The SN54F27 is characterized for operation over

the full military temperature range of – 55

°C to

125

°C. The SN74F27 is characterized for

operation from 0

°C to 70°C.

FUNCTION TABLE

(each gate)

INPUTS

OUTPUT

A

B

C

Y

H

X

X

L

X

HX

L

X

XH

L

L

L

L

H

Y

1

1A

2

1B

13

1C

1Y

12

3

2A

4

2B

5

2C

2Y

6

9

3A

10

3B

11

3C

3Y

8

A

B

C

logic diagram, each gate (positive logic)

≥1

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

IEC Publication 617-12.

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

SN54F27 ...J PACKAGE

SN74F27 ...D OR N PACKAGE

(TOP VIEW)

SN54F27 . . . FK PACKAGE

(TOP VIEW)

32

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

1Y

NC

3C

NC

3B

2A

NC

2B

NC

2C

NC – No internal connection

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1A

1B

2A

2B

2C

2Y

GND

1C

1Y

3C

3B

3A

3Y

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.