Datasheet

www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
OE
6
1
3
4
CLK
D
C1
D
Q
SN74LVC1G374
SINGLE D-TYPE FLIP-FLOP WITH 3-STATE OUTPUT
SCES520B – DECEMBER 2003 – REVISED SEPTEMBER 2006
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.
OE does not affect the internal operations of the flip-flop. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
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
OE CLK D Q
L ↑ L L
L ↑ H H
L H or L X Q
H X X Z
LOGIC DIAGRAM (POSITIVE LOGIC)
2
Submit Documentation Feedback