fxl4td245 Fairchild Semiconductor, fxl4td245 Datasheet - Page 2

• Manufacturer Part Number: fxl4td245
• Description: Fxl4td245 Low Voltage Dual Supply 4-bit Signal Translator With Configurable Voltage Supplies And Signal Levels And 3-state Outputs And Independent Direction Controls
• Manufacturer: Fairchild Semiconductor

©2006 Fairchild Semiconductor Corporation
FXL4TD245 Rev. 1.0.4
Functional Diagram
Connection Diagram
Pin Assignment
T/R
A
OE
0-3
0-3
Pin Number
11–14
3–6
10
15
16
1
2
7
8
9
T/R
T/R
V
A
A
A
A
CCA
0
0
1
2
3 6
3
2
3
4
5
7
V
(Top View)
GND
CCA
1
8
V
OE
16
CCB
9
Terminal Name
15
14
13
12
11
10
V
CCB
T/R
B
B
B
B
T/R
A
B
V
V
GND
T/R
T/R
T/R
T/R
0
1
2
3
0
OE
3
CCA
CCB
–A
–B
1
2
0
3
2
1
3
0
B
0-3
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 following:
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
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
A
B
CCA
CCB
n
n
H
X
X
X
X
X
X
X
n
L
0
Inputs
T/R
H
X
X
X
X
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
T/R
CCA
X
X
X
X
H
X
X
X
L
2
n
CC
should be used to ensure that
CC
CC
inputs (Logic HIGH for A-to-B
T/R
.
.
X
X
X
X
X
X
H
X
Description
L
is at 0 volts, outputs are in
CC
3
CC
.
B0 Data to A0 Output
A0 Data to B0 Output
B1 Data to A1 Output
A1 Data to B1 Output
B2 Data to A2 Output
A2 Data to B2 Output
B3 Data to A3 Output
A3 Data to B3 Output
3-State
.
CCA
supply. A pull-up
Outputs
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n
and
CC