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FXMA2104 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. FXMA2104
Description  Dual-Supply, 4-Bit Voltage Translator / Buffer / Repeater / Isolator
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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FXMA2104 Datasheet(HTML) 6 Page - ON Semiconductor

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© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FXMA2104 • Rev. 1.0.1
5
Functional Description
Power-Up/Power-Down Sequencing
FXM translators offer an advantage in that either VCC
may be powered up first. This benefit derives from the
chip design. When either VCC is at 0V, outputs are in a
high-impedance
state.
The
control
input
(OE)
is
designed to track the VCCA supply. A pull-down resistor
tying OE to GND should be used to ensure that bus
contention, excessive currents, or oscillations do not
occur during power-up/power-down. The size of the pull-
down
resistor
is
based
upon
the
current-sinking
capability of the device driving the OE pin.
The recommended power-up sequence is:
1. Apply power to the first VCC.
2. Apply power to the second VCC.
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 VCC.
3. Remove power from other VCC.
Note:
4.
Alternatively, the OE pin can be hardwired to VCCA
to save GPIO pins. If OE is hardwired to VCCA,
either VCC can be powered up or down first.
Application Circuit
Figure 3. Application Circuit


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