fxma108 Fairchild Semiconductor, fxma108 Datasheet - Page 5

• Manufacturer Part Number: fxma108
• Description: Fxma108 -- Dual-supply, 8-bit Signal Translator With Configurable Voltage Supplies And Signal Levels
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FXMA108 • Rev. 1.0.1
Power-Up/Power-Down Sequence
Fairchild translators offer an advantage in that either
V
the chip design. When either V
in a high-impedance state. The control input (/OE) is
designed to track the V
tying /OE to V
contention, excessive currents, or oscillations do not
occur during power-up or power-down. The size of the
pull-up resistor is based upon the current-sinking
capability of the device driving the /OE pin.
The recommended power-up sequence is:
1.
2.
3.
CC
may be powered up first. This benefit derives from
Apply power to the first V
Apply power to the second V
Drive the /OE input LOW to enable the device.
CCA
should be used to ensure that bus
CCA
CC
supply. A pull-up resistor
.
CC
CC
is at 0V, outputs are
.
5
The recommended power-down sequence is:
1.
2.
3.
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
currents. The bus-hold feature eliminates the need for
extra resistors.
Drive /OE input HIGH to disable the device.
Remove power from either V
Remove power from the other V
I(HOLD)
and/or I
CC
.
CC.
I(OD)
bus-hold
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