Philips Semiconductors

Product specification

74F545

Octal bidirectional transceiver (with 3-State inputs/outputs)

2

1990 Mar 01

853–0375 98992

FEATURES

(70

µA in High and Low states) output

respectively

DESCRIPTION

The 74F545 is an 8-bit, 3-State, high speed transceiver. It provides

bidirectional drive for the bus-oriented microprocessor and digital

communications systems. Straight through bidirectional transceivers

are featured, with 24mA bus drive capability on the A ports and

64mA bus drive capability on the B ports. One input,

Transmit/Receive (T/R) determines the direction of logic signals

through the bidirectional transceiver. Transmit enables data from A

ports to B ports; Receive enables data from B ports to A ports. The

Output Enable input disables both A and B ports by placing them in

a 3-State condition. The 74F545 performs the same function as the

74F245, the only difference being package pin assignment.

PIN CONFIGURATION

20

19

18

17

16

15

14

13

12

10

11

9

8

7

6

5

4

3

2

1

B0

B1

B4

B5

B6

B7

A0

A1

A4

A5

A7

OE

GND

B2

B3

A3

A2

SF01032

A6

T/R

TYPE

TYPICAL

PROPAGATION DELAY

TYPICAL SUPPLY

CURRENT

(TOTAL)

74F545

4.0ns

87mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL

RANGE

PKG DWG #

20-Pin Plastic DIP

N74F545N

SOT146-1

20-Pin Plastic SOL

N74F545D

SOT163-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F(U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

A0–A7, B0–B7

Data inputs

3.5/0.117

70

µA/70µA

OE

Output Enable input (active Low)

2.0/0.067

40

µA/40µA

T/R

Transmit/Receive input

2.0/0.067

40

µA/40µA

A0 - A7

Port A 3-State outputs

150/40

3.0mA/24mA

B0 - B7

Port B 3-State outputs

750/107

15mA/64mA

NOTE: One (1.0) FAST Unit Load is defined as: 20

µA in the High state and 0.6mA in the Low state.