Philips Semiconductors

Product specification

74ALS257/74ALS258

Data selector/multiplexer

1991 Feb 08

4

FUNCTION TABLE – 74ALS257

INPUTS

OUTPUT

OE

S

I0n

I1n

Yn

H

X

X

X

Z

L

L

L

X

L

L

L

H

X

H

L

H

X

L

L

L

H

X

H

H

H = High voltage level

L

= Low voltage level

X = Don’t care

Z = High impedance “off” state

FUNCTION TABLE – 74ALS258

INPUTS

OUTPUT

OE

S

I0n

I1n

Yn

H

X

X

X

Z

L

L

L

X

H

L

L

H

X

L

L

H

X

L

H

L

H

X

H

L

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