FXM2IC102 Datasheet, PDF (2/14 Pages) Fairchild Semiconductor – Dual Supply 2-Bit I2C Interface Voltage Translator with Configurable Voltage Supplies and Signal Levels and Auto Direction Sensing

Connection Diagram
B₀ B₁ OE
7
6
5
Functional Diagram
V_CCA
OE
V_CCB
V_{CCB 8}
4 GND
A₀
1
2
3
B₀
V_CCA A₀ A₁
A₁
(Top Thru View)
B₁
Pin Description
Number Name
1
V_CCA
2, 3 A₀, A₁
4
GND
5
OE
6, 7 B₁, B₀
8
V_CCB
Description
A Side Power Supply
A Side Inputs or 3-State
Outputs
Output Enable Input
B Side Inputs or 3-State
Outputs
B Side Power Supply
Function Table
Control
OE
L
H
Outputs
3-State
Normal Operation
H = HIGH Logic Level
L = LOW Logic Level
Power-Up/Power-Down Sequencing
FXM 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. A pull-down resistor
tying OE to GND should be used to ensure that bus con-
tention, 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 the following:
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 the
following:
1. Drive OE input low to disable the device.
2. Remove power from either V_CC.
3. Remove power from other V_CC.
©2008 Fairchild Semiconductor Corporation
FXM2IC102 Rev. 1.0.0
2
www.fairchildsemi.com