Fairchild Semiconductor 74FR245SJX, 74FR245SJ, 74FR245SCX, 74FR245SC, 74FR245PC Datasheet

© 1999 Fairchild Semiconductor Corporation DS010887 www.fairchildsemi.com

August 1990
Revised August 1999

74FR245 Octal Bidirectional Transceiver with 3-STATE Outputs

74FR245
Octal Bidirectional Transceiver with 3-STATE Outputs

General Description

The 74FR245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bu s-ori­ented applications. Current sinking capability is 64 mA on
both the A and B Ports. The Transmit/Receive (T /R

) input
determines the directio n of data flow through the b idirec­tional transceiver. Transmit (active-HIGH) enables data
from A Ports to B Ports; Receive (active-LOW) enables
data from B Ports to A Ports. The Output Enable input,
when HIGH, disables both A and B P orts by placi ng them
in a High Z condition.

Features

■ Non-inverting buffers

■ Bidirectional data path

■ A and B output sink capability of 64 mA, source

capability of 15 mA

■ Guarante ed pin-to-pin skew

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

Logic Symbol

Pin Descriptions

Connection Diagram

Truth Table

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial

Order Number Package Number Package Description

74FR245SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74FR245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74FR245PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Pin Names Description

OE

Output Enable Input (Active-LOW)

T/R

Transmit/Receive Input

A

0–A7

Side A Inputs or 3-STATE Outputs

B

0–B7

Side B Inputs or 3-STATE Outputs

Inputs

Output

OE

T/R

L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z State

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74FR245

Logic Diagram