H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

4-115

FAST AND LS TTL DATA

3

OCTAL BIDIRECTIONAL

TRANSCEIVER WITH

3-STATE INPUTS/OUTPUTS

The MC54/74F245 contains eight noninverting bidirectional buffers with

3-state outputs and is intended for bus-oriented applications. Current sinking

capability is 24 mA at the A ports and 64 mA at the B ports. The Transmit/Re-

ceive (T/R) input determines the direction of data flow through the bidirectional

transceiver. Transmit (active HIGH) enables data from A ports to B ports; Re-

ceive (active LOW) enables data from B ports to A ports. The Output Enable

input, when HIGH, disables both A and B ports by placing them in a high-Z

condition.

11

12

13

14

15

16

17

18

19

VCC

1

2

3

4

5

6

7

20

OE

B0

B1

B2

B4

B3

A1

T/R

A0

A2

A3

A5

A4

CONNECTION DIAGRAM (TOP VIEW)

8

9

10

B5

B7

B6

A6

GND

A7

FUNCTION TABLE

Inputs

OE

T/R

Output

L

L

H

L

H

X

Bus B Data to Bus A

Bus A Data to Bus B

High-Z State

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54, 74

4.5

5.0

5.5

V

TA

Operating Ambient Temperature Range

54

–55

25

125

°C

74

0

25

70

IOH

Output Current — High

An Outputs

54, 74

–3.0

mA

IOL

Output Current — Low

An Outputs

74

24

mA

IOL

Output Current — Low

An Outputs

54

20

mA

IOH

Output Current — High

Bn Outputs

54

74

–12

–15

mA

IOL

Output Current — Low

Bn Outputs

54

74

48

64

mA

DW SUFFIX

SOIC

CASE 751D-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

MC54/74F245

OCTAL BIDIRECTIONAL

TRANSCEIVER WITH 3-STATE

INPUTS/OUTPUTS

FAST

™ SCHOTTKY TTL

ORDERING INFORMATION

MC54FXXXJ

Ceramic

MC74FXXXN

Plastic

MC74FXXXDW

SOIC