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LSF0101 датащи(PDF) 11 Page - Texas Instruments

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номер детали LSF0101
подробное описание детали  Channel Bidirectional Multi-Voltage Level Translator
Download  39 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LSF0101 датащи(HTML) 11 Page - Texas Instruments

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Vref_A
Vref_B
2
19
3
4
5
6
20
EN
18
17
16
15
1
GND
A1
A2
A3
A4
B1
B2
B3
B4
SW
7
8
9
10
14
13
12
11
A5
A6
A7
A8
B5
B6
B7
B8
LSF0108
SW
SW
SW
SW
SW
SW
SW
11
LSF0101, LSF0102, LSF0108
www.ti.com
SDLS966G – DECEMBER 2013 – REVISED FEBRUAURY 2016
Product Folder Links: LSF0101 LSF0102 LSF0108
Submit Documentation Feedback
Copyright © 2013–2016, Texas Instruments Incorporated
Functional Block Diagrams (continued)
Figure 5. LSF0108 Functional Block Diagram
8.3 Feature Description
The LSF family are bidirectional voltage level translators operational from 0.95 to 4.5 V (Vref_A) and 1.8 to 5.5 V
(Vref_B). This allows bidirectional voltage translations between 1 V and 5 V without the need for a direction pin in
open-drain or push-pull applications. LSF family supports level translation applications with transmission speeds
greater than 100 Mbps for open-drain systems using a 30-pF capacitance and 250-
Ω pullup resistor.
When the An or Bn port is LOW, the switch is in the ON-state and a low resistance connection exists between
the An and Bn ports. The low Ron of the switch allows connections to be made with minimal propagation delay
and signal distortion. Assuming the higher voltage is on the Bn port when the Bn port is HIGH, the voltage on the
An port is limited to the voltage set by Vref_A. When the An port is HIGH, the Bn port is pulled to the drain pull-
up supply voltage (Vpu#) by the pull-up resistors. This functionality allows a seamless translation between higher
and lower voltages selected by the user without the need for directional control.
The supply voltage (Vpu#) for each channel can be individually set up with a pull-up resistor. For example, CH1
can be used in up-translation mode (1.2 V
↔ 3.3 V) and CH2 in down-translation mode (2.5 V ↔ 1.8 V).
When EN is HIGH, the translator switch is on, and the An I/O is connected to the Bn I/O, respectively, allowing
bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state
exists between ports. The EN input circuit is designed to be supplied by Vref_B. To ensure the high-impedance
state during power-up or power-down, EN must be LOW.
8.4 Device Functional Modes
Table 1 expresses the functional modes of the LSF devices.
(1)
EN is controlled by Vref_B logic levels and should be at least 1 V
higher than Vref_A for best translator.
Table 1. Function Table
INPUT EN(1) PIN
FUNCTION
H
An = Bn
L
H-Z


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