CD74HC652 Datasheet, PDF (4/12 Pages) Texas Instruments – High-Speed CMOS Logic Octal-Bus Transceiver/Registers, Three-State

CD74HC652, CD74HCT652
FUNCTION TABLE
INPUTS
DATA I/O
OPERATION OR FUNCTION
OE_AB
H
OE_BA
H
CAB
X
CBA
X
SAB
L
SBA
X
A0 THRU A7
Input
B0 THRU B7
651
652
Output
Real-Time A Data to Real-Time A Data to
B Bus
B Bus
H
H
H or L
X
H
X
Stored A Data to B Stored A Data to B
Bus
Bus
H
L
H or L H or L
H
H
Output
Output
Stored A Data to B Stored A Data to B
Bus and
Bus
Stored B Data to A Stored B Data to A
Bus
Bus
NOTES:
3. To prevent excess currents in the High-Z (isolation) modes, all I/O terminals should be terminated with 10kΩ to 1MΩ resistors.
4. The data output functions may be enabled or disabled by various signals at the OE_AB or OE_BA 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.
5. Select Control = L: Clocks can occur simultaneously.
Select Control = H: Clocks must be staggered in order to load both registers.
4