SN54ABT652A Datasheet, PDF (2/20 Pages) Texas Instruments – OCTAL REGISTERED TRANSCEIVERS WITH 3-STATE OUTPUTS

SN54ABT652A, SN74ABT652A
OCTAL REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS072F – JANUARY 1991 – REVISED MAY 1997
description (continued)
The SN54ABT652A is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74ABT652A is characterized for operation from –40°C to 85°C.
INPUTS
OEAB OEBA CLKAB CLKBA
SAB
FUNCTION TABLE
DATA I/O†
SBA
A1–A8
B1–B8
OPERATION OR FUNCTION
L
H
H or L H or L
X
X
Input
Input
Isolation
L
H
↑
↑
X
X
Input
Input
X
H
↑
H or L
X
X
Input
Unspecified‡
H
H
↑
↑
X‡
X
Input
Output
L
X
H or L
↑
X
X
Unspecified‡
Input
L
L
↑
↑
X
X‡
Output
Input
Store A and B data
Store A, hold B
Store A in both registers
Hold A, store B
Store B in both registers
L
L
X
X
X
L
Output
Input
Real-time B data to A bus
L
L
X
H or L
X
H
Output
Input
Stored B data to A bus
H
H
X
X
L
X
Input
Output
Real-time A data to B bus
H
H
H or L
X
H
X
Input
Output
Stored A data to B bus
H
L
H or L H or L
H
H
Output
Output
Stored A data to B bus and
stored B data to A bus
† _{The data-output functions may be enabled or disabled by a variety of level combinations at OEAB or OEBA. Data-input functions are always}
enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs.
‡ _{Select control = L; clocks can occur simultaneously.}
Select control = H; clocks must be staggered to load both registers.
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