CD74FCT652 Datasheet, PDF (2/12 Pages) Texas Instruments – BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS

CD74FCT652
BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
SCBS734A – JULY 2000 – REVISED JULY 2000
FUNCTION TABLE
OEAB
OEBA
INPUTS
CLKAB CLKBA
SAB
SBA
DATA I/O
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
Store A and B data
X
H
↑
H or L
X
X
Input
Unspecified†
Store A, hold B
H
H
↑
↑
X‡
X
Input
Output
Store A in both registers
L
X
H or L
↑
X
X Unspecified†
Input
Hold A, store B
L
L
↑
↑
X
X‡
Output
Input
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 can be enabled or disabled by various level combinations at OEAB or OEBA. Data input functions}
always are enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs.
‡ _{When select control is low, clocks can occur simultaneously if allowances are made for propagation delays from A to B (B to}
A) plus setup and hold times. When select control is high, clocks must be staggered to load both registers.
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