74ACTQ652 データシートの表示（PDF） - Fairchild Semiconductor
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74ACTQ652 Datasheet PDF : 9 Pages
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Function Table
Inputs
OEAB OEBA CPAB CPBA
SAB
SBA
Inputs/Outputs (Note 1)
A0 thru A7
B0 thru B7
Operating Mode
L
H
H or L H or L
X
X
Isolation
L
H
X
X
Input
Input
Store A and B Data
X
H
H or L
X
X
Input
Not Specified Store A, Hold B
H
H
X
X
Input
Output
Store A in Both Registers
L
X
H or L
X
X
Not Specified
Input
Hold A, Store B
L
L X
X
Output
Input
Store B in Both Registers
L
L
X
X
X
L
L
L
X
H or L
X
H
Output
Input
Real-Time B Data to A Bus
Store B Data to A Bus
H
H
X
X
L
X
H
H
H or L
X
H
X
Input
Output
Real-Time A Data to B Bus
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
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Clock Transition
Note 1: The data output functions may be enabled or disabled by various signals at OEAB or OEBA inputs. Data input functions are always enabled,
i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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