fxl4245 Fairchild Semiconductor, fxl4245 Datasheet - Page 2

• Manufacturer Part Number: fxl4245
• Description: Fxl4245 Low Voltage Dual Supply 8-bit Signal Translator With Configurable Voltage Supplies And Signal Levels And 3-state Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Terminal Descriptions
Truth Table
H
Terminal Assignment
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
0
0
CCA
CCB
HIGH Voltage Level
–A
–B
Terminal
Names
7
7
OE
H
L
L
Inputs
CCA
Terminal Number
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-
T/R
H
X
L
L
10
12
11
1
2
3
4
5
6
7
8
9
CC
LOW Voltage Level
is at 0 volts, outputs are in a
CCA
Bus B Data to Bus A
Bus A Data to Bus B
3-STATE
Description
supply. A pull-up resistor
Terminal Name
Outputs
X
V
GND
GND
T/R
A
A
A
A
A
A
A
A
CCA
Don’t Care
0
1
2
3
4
5
6
7
CC
may
2
Connection Diagram
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
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.
Terminal Number
13
14
15
16
17
18
19
20
21
22
23
24
Terminal Assignments for MLP
(Top View)
CC
CC
Terminal Name
.
.
CC
CC
V
V
GND
.
OE
.
B
B
B
B
B
B
B
B
CCB
CCB
7
6
5
4
3
2
1
0