FXLA0104 Datasheet, PDF (5/17 Pages) Fairchild Semiconductor – Low-Voltage Dual-Supply 4-Bit Voltage Translator with Configurable Voltage Supplies and Signal Levels,

Power-Up/Power-Down Sequence
FXL translators offer an advantage in that either V_CC
may be powered up first. This benefit derives from the
chip design. When either V_CC is at 0V, outputs are in a
high-impedance state. The control input (OE) is
designed to track the V_CCA supply.
The recommended power-up sequence is:
1. Apply power to the first V_CC.
2. Apply power to the second V_CC.
3. Drive the OE input HIGH to enable the device.
The recommended power-down sequence is:
1. Drive OE input LOW to disable the device.
2. Remove power from either V_CC.
3. Remove power from other V_CC.
Pull-Up/Pull-Down Resistors
Do not use pull-up or pull-down resistors. This device
has bus-hold circuits: pull-up or pull-down resistors are
not recommended because they interfere with the
output state. The current through these resistors may
exceed the hold drive, I_I(HOLD) and/or I_I(OD) bus-hold
currents, resulting in data transition and/or auto-
direction sensing failures. The bus-hold feature
eliminates the need for extra resistors.
© 2011 Fairchild Semiconductor Corporation
FXLA0104 • Rev. 1.0.0
5
www.fairchildsemi.com