54ACQ245 • 54ACTQ245
Quiet Series Octal Bidirectional Transceiver with
TRI-STATE
®
Inputs/Outputs
General Description
The ’ACQ/’ACTQ245 contains eight non-inverting bidirec-
tional 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.
The ’ACQ/’ACTQ utilizes NSC Quiet Series technology to
guarantee quiet output switching and improve dynamic
threshold performance. FACT Quiet Series™ features
GTO™ output control and undershoot corrector in addition to
a split ground bus for superior performance.
Features
n I
CC
and I
OZ
reduced by 50%
n Guaranteed simultaneous switching noise level and
dynamic threshold performance
n Improved latch-up immunity
n TRI-STATE outputs drive bus lines or buffer memory
address registers
n Outputs source/sink 24 mA
n Faster prop delays than the standard ’ACT245
n 4 kV minimum ESD immunity (’ACQ)
n Standard Military Drawing (SMD)
— ’ACTQ245: 5962-92187
— ’ACQ245: 5962-92177
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
GTO™ is a trademark of National Semiconductor Corporation.
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
FACT Quiet Series™ is a trademark of Fairchild Semiconductor Corporation.
DS100237-1
IEEE/IEC
DS100237-2
September 1998
54ACQ245
•
54ACTQ245
Quiet
Series
Octal
Bidirectional
T
ransceiver
with
TRI-ST
A
T
E
Inputs/Outputs
© 1998 National Semiconductor Corporation DS100237 www.national.com