54AC245 • 54ACT245
Octal Bidirectional Transceiver with TRI-STATE
®
Inputs/Outputs
General Description
The ’AC/’ACT245 contains eight non-inverting bidirectional
buffers with TRI-STATE outputs and is intended for
bus-oriented applications. Current sinking capability is
24 mA at both the A and B ports. The Transmit/Receive (T/R)
input determines the direction of data flow through the bidi-
rectional 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 ports by placing them in a HIGH
Z condition.
Features
n I
CC
and I
OZ
reduced by 50%
n Noninverting buffers
n Bidirectional data path
n A and B outputs source/sink 24 mA
n ’ACT245 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC245: 5962-87758
— ’ACT245: 5962-87663
Logic Symbols
Pin Description
Names
OE Output Enable Input
T/R Transmit/Receive Input
A
0
–A
7
Side A TRI-STATE Inputs or TRI-STATE Outputs
B
0
–B
7
Side B TRI-STATE Inputs or TRI-STATE Outputs
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
DS100283-1
IEEE/IEC
DS100283-2
August 1998
54AC245
•
54ACT245
Octal
Bidirectional
T
ransceiver
with
TRI-ST
A
T
E
Inputs/Outputs
© 1998 National Semiconductor Corporation DS100283 www.national.com