Datasheet

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
1D
OE
1Q
CLK
To Nine Other Channels
C1
1D
1
13
2
23
SN74LVC821A
10-BIT BUS-INTERFACE FLIP-FLOP
WITH 3-STATE OUTPUTS
SCAS304J – MARCH 1993 – REVISED FEBRUARY 2005
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
(EACH FLIP-FLOP)
INPUTS
OUTPUT
Q
OE CLK D
L ↑ H H
L ↑ L L
L H or L X Q
0
H X X Z
LOGIC DIAGRAM (POSITIVE LOGIC)
2