TC74VCXR162646FT_07 Datasheet, PDF (3/14 Pages) Toshiba Semiconductor – Low-Voltage 16-Bit Bus Transceiver/Register with 3.6-V Tolerant Inputs and Outputs

TC74VCXR162646FT
Truth Table
Control Inputs
Bus
OE
DIR
CAB
CBA
SAB
SBA
A
B
Function
X*
X*
X
X
Input
Z
Input
Z
The output functions of A and B Busses are
disabled.
H
X
Both A and B Busses are used as inputs to
X
X
X
X the internal flip-flops. Data on the Bus will be
stored on the rising edge of the Clock.
X*
X*
L
Input Output
X
L
L
The data on the A bus are displayed on the
B bus.
H
H
L
H
L
L The data on the A bus are displayed on the
X*
L
X
B Bus, and are stored into the A storage
H
H _{flip-flops on the rising edge of CAB.}
X*
X*
H
X
X
Qn
The data in the A storage flop-flops are
displayed on the B Bus.
L
L The data on the A Bus are stored into the A
X*
H
X
H
storage flip-flops on the rising edge of CAB,
H
and the stored data propagate directly onto
the B Bus.
X*
X*
X
Output Input
L
L
L
The data on the B Bus are displayed on the
A bus.
H
H
X*
L
L
L
L The data on the B Bus are displayed on the
X
L
A Bus, and are stored into the B storage
H
H _{flip-flops on the rising edge of CBA.}
X*
X*
X
H
Qn
X
The data in the B storage flip-flops are
displayed on the A Bus.
L
L The data on the B Bus are stored into the B
X*
X
H
H
storage flip-flops on the rising edge of CBA,
H
and the stored data propagate directly onto
the A Bus.
X: Don’t care
Z: High impedance
Qn: The data stored into the internal flip-flops by most recent low to high transition of the clock inputs.
*: The clocks are not internally with either OE or DIR.
Thefore, data on the A and/or B busses may be clocked into the storage flip-flops at any time.
3
2007-10-19