fxlh1t45 Fairchild Semiconductor, fxlh1t45 Datasheet - Page 2

• Manufacturer Part Number: fxlh1t45
• Description: Fxlh1t45 Low Voltage 1-bit Bi-directional Level Translator With Configurable Voltage Supplies And Bushold Data Inputs
• Manufacturer: Fairchild Semiconductor

©2006 Fairchild Semiconductor Corporation
FXLH1T45 Rev. 1.0.4
Functional Diagram
Connection Diagram
Pin Assignment
Pin Descriptions
Pin Names
V
V
T/R
T/R
CCA
CCB
Pin Number
A
B
A
1
2
3
4
5
6
V
GND
Transmit/Receive Input
Side A Input or Output
Side B Input or Output
Side A Power Supply
Side B Power Supply
V
CCA
(Top Through View)
CCA
A
1
2
3
Description
6
5
4
Terminal Name
V
T/R
B
V
CCB
CCB
V
V
GND
T/R
CCA
CCB
A
B
B
2
Function Table
H = HIGH Logic Level
L = LOW Logic Level
Power-Up/Power-Down Sequencing
FXL translators offer an advantage in that either V
may be powered up first. This benefit derives from the
chip design. When either V
HIGH-Impedance state. To ensure that bus contention,
excessive currents, or oscillations do not occur, a proper
power-up sequence is recommended.
The recommended power-up sequence is the following:
1. Apply power to either V
2. Apply power to the T/R input (Logic HIGH for A-to-B
3. Apply power to other V
The recommended power-down sequence is the follow-
ing:
1. Remove power from either V
2. Remove power from other V
operation; Logic LOW for B-to-A operation) and to the
respective data inputs (A Port or B Port). This may
occur at the same time as Step 1.
Inputs (T/R)
H
L
Bus B Data to Bus A
Bus A Data to Bus B
CC
CC
CC
.
.
CC
is at 0V, outputs are in a
CC
.
Outputs
.
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CC