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TLV4021 Folha de dados(PDF) 21 Page - Texas Instruments

Nome de Peças TLV4021
Descrição Electrónicos  TLV40x1 Small-Size, Low-Power Comparator with Precision Reference
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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TLV4021 Folha de dados(HTML) 21 Page - Texas Instruments

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VMON
IN
OUT
V+
s5
Supply
VPULLUP
RPULLUP
(up to 5.5V)
VMON
Supply
IN
OUT
V+
s5
REF
TLV40x1
21
TLV4021, TLV4031, TLV4041, TLV4051
www.ti.com
SNVSB04B – MARCH 2019 – REVISED JUNE 2020
Product Folder Links: TLV4021 TLV4031 TLV4041 TLV4051
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Application Information (continued)
8.1.2 Monitoring a Voltage Other than (V+)
Some applications monitor rails other than the one that is powering the comparator. In these applications the
resistor divider used to set the desired threshold is connected to the rail that is being monitored.
Figure 42. Monitoring a Voltage Other than the Supply
The TLV40x1Ry can monitor a voltage greater than the maximum (V+) with the use of an external resistor divider
network. Likewise, the TLV40x1 can monitor voltages as low as the internal reference voltage (0.2 V, 0.5 V, or
1.2 V). The TLV40x1Ry also has the advantage of being able to monitor high impedance sources since the input
bias current of the input (IN) is low. This provides an advantage over voltage supervisors that can only monitor
the voltage rail that is powering them. Supervisors configured in this fashion have limitations in source
impedance and minimum sensing voltage.
8.1.3 VPULLUP to a Voltage Other than (V+)
For applications where the output of the comparator needs to interface with a reset/enable pin that operates from
a different supply voltage, the open-drain comparators (TLV4021/4031) should be selected. In these usage
cases, the output can be pulled up to any voltage that is lower than 5.5V (independent of (V+)). This technique is
commonly referred to as "level-shifting."
Figure 43. Level-Shifting


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