MC74AC652_15 Datasheet, PDF (3/10 Pages) ON Semiconductor – Octal Transceiver/Register with 3-State Outputs

MC74AC652, MC74ACT652
FUNCTION TABLE
GAB
L
L
GBA
H
H
Inputs
CAB
CBA
H or L H or L
⇑
⇑
SAB
X
X
SBA
X
X
Data I/O*
A₀ − A₇
B₀ − B₇
Input
Input
Operation or Function
Isolation
Store A and B Data
X
H
⇑
H or L
X
X
H
H
⇑
⇑
X**
X
Input
Input
Unspecified* Store A, Hold B
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
L
L
X
X
X
X
H or L
X
L
H
Output
Input
Real-Time B Data to A Bus
Stored 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
*The data output functions may be enabled or disabled by various signals at the GBA and GAB 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.
**Select control = L: clocks can occur simultaneously.
H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial; ⇑ = LOW-to-HIGH Transition
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