5-398

FAST AND LS TTL DATA

OCTAL BUS TRANSCEIVER

The SN54 / 74LS245 is an Octal Bus Transmitter/Receiver designed for

8-line asynchronous 2-way data communication between data buses.

Direction Input (DR) controls transmission of Data from bus A to bus B or bus

B to bus A depending upon its logic level. The Enable input (E) can be used

to isolate the buses.

LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

VCC

DIR

E

B1

B2

B3

B5

B4

B6

A1

A2

A3

A4

A5

A6

A7

9

10

A8 GND

12

11

B7

B8

TRUTH TABLE

INPUTS

OUTPUT

E

DIR

OUTPUT

L

L

Bus B Data to Bus A

L

H

Bus A Data to Bus B

H

X

Isolation

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

54, 74

– 3.0

mA

OH

54

74

– 12

– 15

mA

IOL

Output Current — Low

54

74

12

24

mA

SN54/74LS245

OCTAL BUS TRANSCEIVER

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03