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National Semiconductor Electronic Components Datasheet

74ACTQ16245 Datasheet

16-Bit Transceiver

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April 1993
54ACTQ 74ACTQ16245
16-Bit Transceiver with TRI-STATE Outputs
General Description
The ’ACTQ16245 contains sixteen non-inverting bidirection-
al buffers with TRI-STATE outputs and is intended for bus
oriented applications The device is byte controlled Each
has separate control inputs which can be shorted together
for full 16-bit operation The T R inputs determine the direc-
tion of data flow through the device The OE inputs disable
both the A and B ports by placing them in a high impedance
state
The ’ACTQ16245 utilizes NSC Quiet Series technology to
guarantee quiet output switching and improved dynamic
threshold performance FACT Quiet SeriesTM features
GTOTM output control for superior performance
Features
Y Utilizes NSC FACT Quiet Series technology
Y Guaranteed simultaneous switching noise level and
dynamic threshold performance
Y Guaranteed pin-to-pin output skew
Y Bidirectional non-inverting buffers
Y Separate control logic for each byte
Y 16-bit version of the ’ACTQ245
Y Outputs source sink 24 mA
Y Additional specs for multiple output switching
Y Output loading specs for both 50 pF and 250 pF loads
Logic Symbol
Connection Diagram
Pin Assignment for
SSOP and CERPAK
TL F 10926 – 1
Pin Description
Pin Names
OEn
TR
A0 – A15
B0 – B15
Description
Output Enable Input (Active Low)
Transmit Receive Input
Side A Inputs Outputs
Side B Outputs Inputs
TRI-STATE is a registered trademark of National Semiconductor Corporation
FACTTM FACT Quiet SeriesTM and GTOTM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 10926
TL F 10926 – 2
RRD-B30M75 Printed in U S A


National Semiconductor Electronic Components Datasheet

74ACTQ16245 Datasheet

16-Bit Transceiver

No Preview Available !

Functional Description
The ’ACTQ16245 contains sixteen non-inverting bidirection-
al buffers with TRI-STATE outputs The device is byte con-
trolled with each byte functioning identically but indepen-
dent of the other The control pins can be shorted together
to obtain full 16-bit operation The following description ap-
plies to each byte When the T R input is HIGH then Bus A
data is transmitted to Bus B When the T R input is
Truth Tables
LOW Bus B data is transmitted to Bus A The TRI-STATE
outputs are controlled by an Output Enable (OEn) input for
each byte When OEn is LOW the outputs are in 2-state
mode When OEn is HIGH the outputs are in the high im-
pedance mode but this does not interfere with entering new
data into the inputs
Inputs
OE1
T R1
LL
LH
HX
Outputs
Bus B0 – B7 Data to Bus A0 – A7
Bus A0 – A7 Data to Bus B0 – B7
HIGH-Z State on A0 – A7 B0 – B7
Inputs
OE2
T R2
LL
LH
HX
H e High Voltage Level
L e Low Voltage Level
X e Immaterial
Z e High Impedance
Outputs
Bus B8 – B15 Data to Bus A8 – A15
Bus A8 – A15 Data to Bus B8 – B15
HIGH-Z State on A8 – A15 B8 – B15
Logic Diagram
TL F 10926 – 1
2


Part Number 74ACTQ16245
Description 16-Bit Transceiver
Maker National Semiconductor
Total Page 8 Pages
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