Datasheet

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
OE
6
1
3
4
LE
D
C
D
Q
SN74LVC1G373
SINGLE D-TYPE LATCH
WITH 3-STATE OUPUT
SCES528C – DECEMBER 2003 – REVISED MAY 2007
OE does not affect the internal operations of the latch. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
A buffered output-enable ( OE) input can be used to place the output in either a normal logic state (high or low
logic levels) or the high-impedance state. In the high-impedance state, the output neither loads nor drives the
bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines
without interface or pullup components.
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.
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.
FUNCTION TABLE
INPUTS
OUTPUT
Q
OE LE D
L H L L
L H H H
L L X Q
0
H X X Z
LOGIC DIAGRAM (POSITIVE LOGIC)
2
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