Philips Semiconductors

Product specification

74ALS251

8-input multiplexer (3-State)

1991 Feb 08

3

LOGIC DIAGRAM

GND = Pin 8

SC00069

I0

I1

I2

I3

I4

I5

I6

I7

4

3

2

1

15

14

13

12

S2

S1

S0

OE

9

10

11

7

56

YY

FUNCTION TABLE

INPUTS

OUTPUTS

S2

S1

S0

OE

Y

Y

X

X

X

H

Z

Z

L

L

L

L

I0

I0

L

L

H

L

I1

I1

L

H

L

L

I2

I2

L

H

H

L

I3

I3

H

L

L

L

I4

I4

H

L

H

L

I5

I5

H

H

L

L

I6

I6

H

H

H

L

I7

I7

H = High voltage level

L

= Low voltage level

X = Don’t care

Z = High impedance “off” state

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device.

Unless otherwise noted these limits are over the operating free air temperature range.)

SYMBOL

PARAMETER

RATING

UNIT

Supply voltage

–0.5 to +7.0

V

Input voltage

–0.5 to +7.0

V

Input current

–30 to +5

mA

Voltage applied to output in High output state

V

Current applied to output in Low output state

48

mA

Operating free-air temperature range

0 to +70

°C

Storage temperature range

–65 to +150

°C

RECOMMENDED OPERATING CONDITIONS

SYMBOL

PARAMETER

LIMITS

UNIT

SYMBOL

PARAMETER

MIN

NOM

MAX

UNIT

Supply voltage

4.5

5.0

5.5

V

High-level input voltage

2.0

V

Low-level input voltage

0.8

V

Input clamp current

–18

mA

High-level output current

–2.6

mA

Low-level output current

24

mA

Operating free-air temperature range

0

+70

°C