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TPS3707-33DG4 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS3707-33DG4
Description  Processor Supervisory Circuits With Power-Fail
Download  28 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3707-33DG4 Fiches technique(HTML) 11 Page - Texas Instruments

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background image
Reset
Logic + Timer
_
+
_
+
R1
R2
14 kΩ
Reference
Voltage
of 1.25 V
Watchdog
Logic + Timer
Oscillator
40 kΩ
Transition
Detection
VDD
MR
GND
PFI
WDI
RESET
RESET
PFO
WDO
Only
TPS3705
Only
TPS3707
Only
TPS3705
TPS3705
TPS3707
Copyright © 2016, Texas Instruments Incorporated
11
TPS3705-30, TPS3705-33, TPS3705-50, TPS3707-30, TPS3707-50
www.ti.com
SLVS184D – NOVEMBER 1998 – REVISED MAY 2016
Product Folder Links: TPS3705-30 TPS3705-33 TPS3705-50 TPS3707-30 TPS3707-50
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS370x-xx family of supervisors feature an integrated reference and comparator for VDD supervision, an
additional power-fail supervisor, and a manual reset input. The TPS3705-xx devices feature a watchdog timer,
where the TPS3707-xx devices feature a complimentary RESET output.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Manual Reset Input
The TPS370x-xx devices incorporate a manual reset input, MR. A low level at MR causes RESET to become
active.
8.3.2 Power-Fail Comparator
The TPS370x-xx family integrates a power-fail comparator which can be used for low-battery detection, power-
fail warning, or for monitoring a power supply other than the main supply.
8.3.3 Watchdog Timer
The TPS3705-xx devices have a watchdog timer that is periodically triggered by a positive or negative transition
at WDI. When the supervising system fails to retrigger the watchdog circuit within the timeout interval,
tt(out) = 1.6 s, WDO becomes active. This event also reinitializes the watchdog timer. Leaving WDI unconnected
disables the watchdog.
The TPS3707-xx devices do not have the watchdog function, but include a high-level output RESET.


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