fxl4t245 Fairchild Semiconductor, fxl4t245 Datasheet - Page 2

• Manufacturer Part Number: fxl4t245
• Description: Fxl4t245 Low Voltage Dual Supply 4-bit Signal Translator With Configurable Voltage Supplies And Signal Levels And 3-state Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Terminal Descriptions
Connection Diagram
Power-Up/Power-Down Sequencing
FXL translators offer an advantage in that either V
be powered up first. This benefit derives from the chip
design. When either V
HIGH-Impedance state. The control inputs (T/R and OE)
are designed to track the V
tying OE to V
tention, excessive currents, or oscillations do not occur
during power-up/power-down. The size of the pull-up resis-
tor is based upon the current-sinking capability of the OE
driver.
OE
T/R
A
B
V
V
GND
n
n
CCA
CCB
Terminal
Names
Terminal Assignments for DQFN
CCA
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Side A Power Supply
Side B Power Supply
Ground
should be used to ensure that bus con-
CC
(Top View)
is at 0 volts, outputs are in a
CCA
Description
supply. A pull-up resistor
CC
may
2
Truth Table
H
L
X
Terminal Assignment
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
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
LOW Voltage Level
HIGH Voltage Level
Don’t Care
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.
OE
L
L
Terminal Number
Inputs
10
11
12
13
14
1
2
3
4
5
6
7
8
9
T/R
H
L
CC
CC
.
Bus B Data to Bus A
Bus A Data to Bus B
.
CC
CC
Terminal Name
.
.
V
V
GND
GND
Outputs
T/R
OE
CCA
A
A
A
A
B
B
B
B
CCB
0
1
2
3
3
2
1
0