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TPS3839G12DBZR Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS3839G12DBZR
Description  Ultralow Power, Supply Voltage Monitor
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3839G12DBZR Datasheet(HTML) 11 Page - Texas Instruments

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Transient
Duration
(t )
W
Transient
Amplitude
V
DD
V
IT-
Delay
V
REF
VDD
GND
RESET
MR
(
Only)
TPS3831
VDD
TPS3831, TPS3839
www.ti.com
SBVS193D – JUNE 2012 – REVISED JULY 2015
8 Detailed Description
8.1 Overview
The TPS3831 and TPS3839 are ultralow current voltage supervisory circuits that monitor the input supply voltage
of these devices. Both devices assert an active-low reset whenever the VDD supply voltage drops below the
negative-going
threshold
voltage
(VIT–).
The
output,
RESET,
remains
asserted
for
approximately
200 ms after the VDD voltage rises above the positive-going threshold voltage (VIT– + Vhys). These devices are
designed to ignore fast transients on the VDD pin.
The TPS3831 device includes a manual reset input (MR) that can be used to force the RESET signal low, even if
the supply voltage is above VIT–.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 VDD Transient Rejection
The TPS383x (TPS3831 and TPS3839) devices have built-in rejection of fast transients on the VDD pin.
Transient rejection depends on both the duration and amplitude of the transient. Transient amplitude is measured
from the bottom of the transient to the negative threshold voltage (VIT–) of the device, as shown in Figure 12.
Figure 12. Voltage Transient Measurement
Copyright © 2012–2015, Texas Instruments Incorporated
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