HC652 Datasheet, PDF (6/9 Pages) System Logic Semiconductor – Octal 3-State Bus Transceivers and D Flip-Flops

SL74HC652
FUNCTION TABLE
Dir. OE CAB CBA SAB SBA
A
B
FUNCTION
INPUTS INPUTS Both the A bus and the B bus are inputs.
L HXXXX
Z
Z
The output functions of the A and B bus
are disabled.
X X INPUTS
INPUTS
Both the A and B bus are used for inputs
to the internal flip-flops. Data at the bus
will be stored on low to high transition of
the clock inputs.
OUTPUTS INPUTS The A bus are outputs and the B bus are
inputs.
X^* X
X
L
L
H
L
The data at the B bus are displayed at the
H
A bus.
L
L X^*
XL
L
H
X^* X X H
Qn
L
The data at the B bus are displayed at the
H
A bus. The data of the B bus are stored to
the internal flip-flops on low to high
transition of the clock pulse.
X
The data stored to the internal flip-flops,
are displayed at the A bus.
X^*
XH
H
H
The data at the B bus are stored to the
L
L
internal flip-flops on low to high transition
of the clock pulse. The states of the
internal flip-flops output directly to the A
bus.
INPUTS OUTPUTS The A bus are inputs and the B bus are
outputs.
X X^* L X
L
H
HH
X^*
L
X
L
H
L
The data at the A bus are displayed at the
H
B bus.
L
The data at the B bus are displayed at the
H
A bus. The data of the B bus are stored to
the internal flip-flops on low to high
transition of the clock pulse.
X X^* H X
X
X^* H X
L
H
Qn The data stored to the internal flip-flops
are displayed at the B bus.
L
The data at the A bus are stored to the
H
internal flip-flops on low to high transition
of the clock pulse. The states of the
internal flip-flops output directly to the B
bus.
OUTPUTS OUTPUTS Both the A bus and the B bus are outputs
H LXXHH
Qn
Qn The data stored to the internal flip-flops
are displayed at the A and B bus
respectively.
HH
Qn
Qn The output at the A bus are displayed at
the B bus, the output at the B bus are
displayed at the A bus respec.
X : DON’T CARE
Z : HIGH IMPEDANCE
Qn : THE DATA STORED TO THE INTERNAL FLIP-FLOPS BY MOST RECENT LOW TO HIGH TRANSITION
OF THE CLOCK INPUTS
* _{: THE DATA AT THE A AND B BUS WILL BE STORED TO THE INTERNAL FLIP-FLOPS ON EVERY LOW TO}
TRANSITION OF THE CLOCK INPUTS
SLS
System Logic
Semiconductor