Philips Semiconductors

Product specification

74F298

Quad 2-input multiplexer with storage

1989 Aug 14

3

LOGIC DIAGRAM

I1a

I0a

I1b

I0b

I1c

I0c

I1d

I0d

23

1

4

5

9

6

7

15

14

13

12

Qa

Qb

Qc

Qd

GND = Pin 8

SF00862

R

CP

SQa

R

CP

SQb

R

CP

SQc

R

CP

SQd

S

CP

10

11

FUNCTION TABLE

INPUTS

OUTPUT

OPERATING MODE

CP

S

I0n

I1n

Qn

OPERATING MODE

↓

l

l

X

L

Load source “0”

↓

l

h

X

H

Load source “0”

↓

h

X

l

L

Load source “1”

↓

h

X

h

H

Load source “1”

H

=

High voltage level

h

=

High voltage level one setup time prior to the High-to-Low

clock transition

L

=

Low voltage level

l

=

Low voltage level one setup time prior to the High-to-Low

clock transition

X

=

Don’t care

↓

=

High-to-Low clock transition

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limits 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

40

mA

Operating free-air temperature range

0 to +70

°C

Storage temperature range

–65 to +150

°C