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National Semiconductor Electronic Components Datasheet

74ACTQ16646 Datasheet

16-Bit Transceiver/Register

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March 1993
54ACTQ 74ACTQ16646
16-Bit Transceiver Register
with TRI-STATE Outputs
General Description
The ’ACTQ16646 contains sixteen non-inverting bidirection-
al registered bus transceivers providing multiplexed trans-
mission of data directly from the input bus or from the inter-
nal storage registers Each byte has separate control inputs
which can be shorted together for full 16-bit operation The
DIR inputs determine the direction of data flow through the
device The CPAB and CPBA inputs load data into the regis-
ters on the LOW-to-HIGH transition The ’ACTQ16646 uti-
lizes NSC Quiet Series technology to guarantee quiet output
switching and improved dynamic threshold performance
FACT Quiet SeriesTM features GTOTM output control and
undershoot corrector 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 Independent registers for A and B buses
Y Multiplexed real-time and stored data transfers
Y Separate control logic for each byte
Y 16-bit version of the ’ACTQ646
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 10937 – 1
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 10937
TL F 10937 – 2
RRD-B30M75 Printed in U S A


National Semiconductor Electronic Components Datasheet

74ACTQ16646 Datasheet

16-Bit Transceiver/Register

No Preview Available !

Real Time Transfer
A-Bus to B-Bus
Real Time Transfer
B-Bus to A-Bus
Storage from
Bus to Register
Transfer from
Register to Bus
TL F 10937 – 3
FIGURE 1
TL F 10937 – 4
FIGURE 2
TL F 10937 – 5
FIGURE 3
TL F 10937 – 6
FIGURE 4
Function Table
Inputs
G1 DIR1 CPAB1 CPBA1 SAB1 SBA1
H X H or L H or L
HX
L
X
HX X L
X
X
X
X
X
X
Data I O
A0 – 7
B0 – 7
Input
Input
Output Operation Mode
Isolation
Clock An Data into A Register
Clock Bn Data Into B Register
LH
X
LH
L
L H H or L
LH
L
X
X
X
X
LX
An to Bn Real Time (Transparent Mode)
L
H
X
X
Input
Output
Clock An Data to A Register
A Register to Bn (Stored Mode)
HX
Clock An Data into A Register and Output to Bn
LL
LL
LL
LL
X XX
X LX
X
H or L
X
X LX
L Bn to An Real Time (Transparent Mode)
L
H
Output
Input
Clock Bn Data into B Register
B Register to An (Stored Mode)
H Clock Bn into B Register and Output to An
The data output functions may be enabled or disabled by various signals at the G and DIR inputs Data input functions are always enabled i e data at the bus
pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs Also applies to data I O (A and B 8-15) and 2 control pins
H e HIGH Voltage Level
X e Immaterial
L e LOW Voltage Level L e LOW-to-HIGH Transition
2


Part Number 74ACTQ16646
Description 16-Bit Transceiver/Register
Maker National Semiconductor
Total Page 10 Pages
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