參數(shù)資料
型號： FXLH42245
廠商： Fairchild Semiconductor Corporation
英文描述： Low Voltage Dual Supply 8-Bit Signal Translator with Configurable Voltage Supplies and Bushold Data Inputs and 3-STATE Outputs and 26з Series Resisto
中文描述： 低電壓雙電源，8位信號翻譯可配置電壓用品和Bushold數(shù)據(jù)輸入和三態(tài)輸出和26з系列Resisto
文件頁數(shù)： 2/10頁
文件大小： 557K
代理商： FXLH42245
www.fairchildsemi.com
2
F
Pin Descriptions
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Don’t Care
Connection Diagram
Terminal Assignments for DQFN
(Top Through View)
Pin Assignments
Power-Up/Power-Down Sequencing
FXL translators offer an advantage in that either V
CC
may
be powered up first. This benefit derives from the chip
design. When either V
CC
is at 0 volts, outputs are in a
HIGH-Impedance state. The control inputs (T/R and OE)
are designed to track the V
CCA
supply. A pull-up resistor
tying OE to V
CCA
should be used to ensure that bus con-
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.
The recommended power-up sequence is the following:
1. Apply power to either V
CC
.
2. Apply power to the T/R input (Logic HIGH for A-to-B
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.
3. Apply power to the other V
CC
.
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
CC
.
3. Remove power from the other V
CC
.
Pin Names
Description
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0
- A
7
B
0
- B
7
V
CCA
V
CCB
GND
Side A Input or 3-STATE Output
Side B Input or 3-STATE Output
Side A Power Supply
Side B Power Supply
Ground
Inputs
Outputs
OE
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
3-STATE
Pin Number
1
Pin Name
V
CCA
T/R
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
GND
Pin Number
13
Pin Name
GND
2
3
4
5
6
7
8
9
14
15
16
17
18
19
20
21
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
OE
V
CCB
V
CCB
10
11
12
22
23
24
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