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LSF0102 датащи(PDF) 21 Page - Texas Instruments

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номер детали LSF0102
подробное описание детали  LSF010x 1/2/8 Channel Auto-Bidirectional Multi-Voltage Level Translator for Open- Drain and Push-Pull Applications
PDF  57 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

LSF0102 датащи(HTML) 21 Page - Texas Instruments

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Vref_A
VCCB
EN
200 kΩ
A1
A2
B1
B2
GND
LSF0108
Vref_B
3.3 V
Device
3.3 V
RB1
0.1 μF
RA1
1.8 V
Device
1.8 V
VCCA
Figure 9-5. Single Supply Translation with 3.3 V Supply
The steps to select the resistor values for R1 and R2 are as follows:
1. Select a value for R1. Typically, 1 MΩ is used to reduce current consumption.
2. Plug in values for your system into the the following equation. Note that Vref_A is the lowest voltage in the
system. VCCB is the primary supply and R1 is the selected value from step 1.
R2 =  200 103 × R1 × VREFA
200 103 + R1 VCCB − VREFA − 0.85 × R1 
(4)
The single supply used must be at least 0.8 V larger than the lowest desired translation voltage. The voltage at
Vref_A must be selected as the lowest voltage to be used in the system. The LSF evaluation module (LSF-EVM)
contains unpopulated pads to place R1 and R2 for single supply operation testing. For an example single supply
translation schematic and details, see the Single Supply Translation with the LSF Family video.
www.ti.com
LSF0108
SDLS966L – DECEMBER 2013 – REVISED DECEMBER 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: LSF0108



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