fxl2td245 Fairchild Semiconductor, fxl2td245 Datasheet - Page 2

• Manufacturer Part Number: fxl2td245
• Description: Fxl2td245 Low Voltage Dual Supply 2-bit Signal Translator With Configurable Voltage Supplies And Signal Levels And
• Manufacturer: Fairchild Semiconductor

©2005 Fairchild Semiconductor Corporation
FXL2TD245 Rev. 1.0.4
Functional Diagram
Connection Diagram
Pin Assignment
T/R
T/R
OE
A
A
0
0
1
1
Pin Number
V
CCB
10
1
2
3
4
5
6
7
8
9
V
B
10
CCA
1
9
V
0
CCA
(Top View)
B
A
8
2
1
0
OE
A
7
3
1
Terminal Name
T/R
T/R
6
5
4
V
V
GND
T/R
T/R
OE
CCA
A
A
B
B
CCB
V
1
0
0
1
1
0
CCB
GND
0
1
B
B
0
1
2
Pin Descriptions
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
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
a HIGH-Impedance state. The control inputs (T/R
OE) are designed to track the V
resistor tying OE to V
bus contention, excessive currents, or oscillations do not
occur during power-up/power-down. The size of the pull-
up resistor is based upon the current-sinking capability
of the OE driver.
The recommended power-up sequence is the following:
1. Apply power to either V
2. Apply power to the T/R
3. Apply power to other V
4. Drive the OE input LOW to enable the device.
The recommended power-down sequence is the follow-
ing:
1. Drive OE input HIGH to disable the device.
2. Remove power from either V
3. Remove power from other V
Pin Names
OE T/R
H
L
L
L
L
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.
V
V
T/R
OE
Inputs
A
B
CCA
CCB
n
n
n
H
X
X
X
L
0
T/R
H
X
X
X
L
Output Enable Input
Transmit/Receive Inputs
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Side A Power Supply
Side B Power Supply
1
B
A
B
A
3-STATE
CCA
0
0
1
1
Data to A
Data to B
Data to A
Data to B
n
CC
should be used to ensure that
CC
CC
inputs (Logic HIGH for A-to-B
.
.
Description
is at 0 volts, outputs are in
CC
CC
0
0
1
1
Outputs
.
CCA
.
Output
Output
Output
Output
supply. A pull-up
www.fairchildsemi.com
n
and
CC