fxlh42245 Fairchild Semiconductor, fxlh42245 Datasheet - Page 2

• Manufacturer Part Number: fxlh42245
• Description: Fxlh42245 Low Voltage Dual Supply 8-bit Signal Translator With Configurable Voltage Supplies Andbushold Data Inputs And 3-state Outputs And 26w Series Resistors In The B Port Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Pin Descriptions
Truth Table
H
L
X
Pin Assignments
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
Pin Names
LOW Voltage Level
HIGH Voltage Level
Don’t Care
- A
- B
OE
H
7
7
L
L
Inputs
CCA
Output Enable Input
Transmit/Receive Input
Side A Input or 3-STATE Output
Side B Input or 3-STATE Output
Side A Power Supply
Side B Power Supply
Ground
Pin Number
should be used to ensure that bus con-
T/R
H
X
L
10
12
11
1
2
3
4
5
6
7
8
9
CC
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
Outputs
Pin Name
V
GND
GND
T/R
A
A
A
A
A
A
A
A
CCA
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 the 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 the 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.
Pin Number
Terminal Assignments for DQFN
13
14
15
16
17
18
19
20
21
22
23
24
(Top Through View)
CC
.
CC
Pin Name
CC
.
V
V
GND
OE
.
B
B
B
B
B
B
B
B
CCB
CCB
CC
7
6
5
4
3
2
1
0
.