Philips Semiconductors

Product specification

74ALS27

Triple 3-input NOR gate

2

1991 Feb 08

853–1162 01670

TYPE

TYPICAL

PROPAGATION DELAY

TYPICAL

SUPPLY CURRENT

(TOTAL)

74ALS27

4.0ns

1.5mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

COMMERCIAL RANGE

DRAWING

NUMBER

14-pin plastic DIP

74ALS27N

SOT27-1

14-pin plastic SO

74ALS27D

SOT108-1

PIN CONFIGURATION

14

13

12

11

10

9

8

7

6

5

4

3

2

1

1A

1B

2A

2B

2C

2Y

GND

3Y

3A

3B

3C

1Y

1C

SC00014

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74ALS (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

nA, nB, nC

Data inputs

1.0/1.0

20

µA/0.1mA

nY

Data output

20/80

0.4mA/8mA

NOTE:

One (1.0) ALS unit load is defined as: 20

µA in the High state and 0.1mA in the Low state.

LOGIC SYMBOL

GND = Pin 7

12

13

3

4

59

10

1A 1B 1C 2A 2B 2C 3A 3B

1Y 2Y 3Y

12

6

8

SC00016

11

3C

IEC/IEEE SYMBOL

SF00036

w1

12

6

8

1

2

13

3

4

5

9

10

11

LOGIC DIAGRAM

GND = Pin 7

1A

1B

1Y

12

1

2

SC00028

1C

13

2A

2B

2Y

6

3

4

2C

5

3A

3B

3Y

8

9

10

3C

11

FUNCTION TABLE

INPUTS

OUTPUT

nA

nB

nC

nY

H

X

X

L

X

H

X

L

X

X

H

L

L

L

L

H

H = High voltage level

L

= Low voltage level

X = Don’t care