74ACT652 Fairchild Semiconductor, 74ACT652 Datasheet - Page 2

• Manufacturer Part Number: 74ACT652
• Description: Transceiver/Register
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Function Table
H
L

X
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.
OEAB
LOW Voltage Level
HIGH Voltage Level
Immaterial
LOW-to-HIGH Clock Transition
H
H
H
H
X
L
L
L
L
L
L
OEBA
H
H
H
H
X
H
H
L
L
L
L
CPAB
H or L
H or L
H or L
H or L




X
X
X
Inputs
CPBA
H or L
H or L
H or L
H or L




X
X
X
SAB
H
H
X
X
X
X
X
X
X
X
L
SBA
X
X
X
X
X
X
H
X
X
H
L
Input
Input
Input
Not Specified
Output
Output
Input
Output
A
2
Inputs/Outputs (Note 1)
0
thru A
7
Input
Not Specified
Output
Input
Input
Input
Output
Output
B
0
thru B
7
Store A, Hold B
Isolation
Store A and B Data
Store A in Both Registers
Hold A, Store B
Store B in Both Registers
Real-Time B Data to A Bus
Store B Data to A Bus
Real-Time A Data to B Bus
Stored A Data to B Bus
Stored A Data to B Bus and
Stored B Data to A Bus
Operating Mode