© 1999 Fairchild Semiconductor Corporation DS012114 www.fairchildsemi.com
April 1995
Revised August 1999
7
4FR2245
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74FR2245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
The 74FR2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus-ori-
ented applications. Current sinking capability is 64 mA on
the A Port. The Transmit/Receive (T/R) input determines
the direction of data flow through the bidirectional trans-
ceiver. 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, dis-
ables both A and B Ports by placing them in a High Z con-
dition.
Features
a73 Non-inverting buffers
a73 Bidirectional data path
a73 Guaranteed pin-to-pin skew
a73 25Ω series resistors in B outputs eliminate the need for
external resistors
a73 3-STATE outputs drive bus lines or buffer memory
address resistors

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” letter 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
74FR2245SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Pin Names Description
OE Output Enable Input (Active-LOW)
T/R Transmit/Receive Input
A
0
–A
7
Side A Inputs or 3-STATE Outputs
B
0
–B
7
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