Philips Semiconductors

Product specification

74F2952, 74F2953

Transceivers

1989 Sep 22

6

FUNCTION TABLE for Register An or Bn

INPUTS

INTERNAL

OPERATING

An or Bn

CPXX

CEXX

Q

MODE

X

X

H

NC

Hold data

L

↑

L

L

Load data

H

↑

L

H

Load data

H = High voltage level

L

= Low voltage level

↑ = Low-to-High transition

X = Don’t Care

XX = AB or BA

NC= No Change

FUNCTION TABLE for Output Enable

INPUTS

INTERNAL

An or Bn OUTPUTS

OPERATING

OEXX

Q

74F2952

74F2953

MODE

H

X

Z

Z

Disable outputs

L

L

L

H

Enable outputs

L

H

H

L

Enable outputs

H = High voltage level

L

= Low voltage level

X = Don’t Care

XX = AB or BA

Z = High impedance “off” state

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

–0.5 to +5.5

V

I

Current applied to output in Low output state

A0 – A7

48

mA

Current applied to output in Low output state

B0 – B7

128

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

A0 – A7

–3

mA

High-level output current

B0 – B7

–15

mA

I

Low level output current

A0 – A7

24

mA

Low-level output current

B0 – B7

64

mA

Operating free-air temperature range

0

+70

°C