Philips Semiconductors

Product specification

74ALS645A/74ALS645A-1

Octal transceiver (3-State)

1991 Jun 03

3

LOGIC DIAGRAM

SF00201

18

B0

17

B1

16

B2

15

B3

14

B4

13

B5

12

B6

11

B7

A0

A1

A2

A3

A4

A5

A6

A7

23

4567

89

19

1

OE

T/R

GND = Pin 10

FUNCTION TABLE

INPUTS

OUTPUTS

OE

T/R

OUTPUTS

L

L

Bus B data to Bus A

L

H

Bus A data to Bus B

H

X

Z

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

I

Current applied to output in Low output state

All versions

48

mA

Current applied to output in Low output state

-1 version

96

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

–15

mA

Low level output current

All versions

24

mA

Low-level output current

-1 version

mA

Operating free-air temperature range

0

+70

°C

NOTES: