74F2645SCX View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

View to exact match

74F2645SCX

Octal Bus Transceiver with 25Ω Series Resistors in the Outputs

Fairchild Semiconductor 

Unit Loading/Fan Out

Pin Names

OE

T/R

A0–A7

B0–B7

Description

Output Enable Input (Active LOW)

Transmit/Receive Input

Side A Inputs or

3-STATE Outputs

Side B Inputs or

3-STATE Outputs

U.L.

HIGH/LOW

1.0/1.0

1.0/1.0

3.5/0.667

750/20

3.5/0.667

750/20

Input IIH/IIL

Output IOH/IOL

20 µA/−0.6 mA

20 µA/−0.6 mA

70 µA/−0.4 mA

−15 mA/12 mA

70 µA/−0.4 mA

−15 mA/12 mA

Functional Description

The output enable (OE) is active LOW. If the device is dis-

abled (OE HIGH), the outputs are in the high impedance

state. The transmit/receive input (T/R) controls whether

data is transmitted from the A bus to the B bus or from the

B bus to the A bus. When T/R is LOW, B data is sent to the

A bus. If T/R is HIGH, A data is sent to the B bus.

Function Table

Inputs

OE

T/R

L

L

L

H

H

X

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

Z = High Impedance State

Outputs

Bus B data to Bus A

Bus A data to Bus B

Z

Logic Diagram

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