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TPS3813J25DBVT Datasheet(PDF) 1 Page - Texas Instruments

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Part # TPS3813J25DBVT
Description  Family Processor Supervisory Circuits With Window-Watchdog
Download  24 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3813J25DBVT Datasheet(HTML) 1 Page - Texas Instruments

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V
DD
V
DD
WDR
WDT
WDI
GND
TPS3813
V
DD
RESET
I/O
GND
µC
C
WP
0.1 µF
0.1 µF
R
Copyright © 2016, Texas Instruments Incorporated
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
SLVS331H – DECEMBER 2000 – REVISED JULY 2016
TPS3813xxx Family Processor Supervisory Circuits With Window-Watchdog
1
1 Features
1
Window-Watchdog With Programmable Delay and
Window Ratio
6-Pin SOT-23 Package
Supply Current of 9 µA (Typical)
Power-On Reset Generator With a Fixed Delay
Time of 25 ms
Precision Supply Voltage Monitor: 2.5 V, 3 V, 3.3
V, and 5 V
Open-Drain Reset Output
Temperature Range: –40°C to 85°C
2 Applications
Applications Using DSPs, Microcontrollers, or
Microprocessors
Safety Critical Systems
Automotive Systems
Heating Systems
Typical Operating Circuit
3 Description
The
TPS3813xxx
family
of
supervisory
circuits
provide circuit initialization and timing supervision,
primarily for DSPs and processor-based systems.
During power on, RESET is asserted when supply
voltage (VDD) becomes higher than 1.1 V. Thereafter,
the supervisory circuit monitors VDD and keeps
RESET active as long as VDD remains below the
threshold voltage (VIT). An internal timer delays the
return of the output to the inactive state (high) to
ensure proper system reset. The delay time, td = 25
ms typical, starts after VDD has risen above the
threshold voltage (VIT). When the supply voltage
drops below the threshold voltage (VIT), the output
becomes active (low) again. No external components
are required. All the devices of this family have a
fixed-sense threshold voltage (VIT) set by an internal
voltage divider.
For safety critical applications the TPS3813xxx family
incorporates
a
so-called
window-watchdog
with
programmable delay and window ratio. The upper
limit of the watchdog time-out can be set by either
connecting WDT to GND, VDD, or using an external
capacitor. The lower limit and thus the window ratio is
set by connecting WDR to GND or VDD. The
supervised processor now needs to trigger the
TPS3813xxx within this window not to assert a
RESET.
The product spectrum is designed for supply voltages
of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are
available in a 6-pin SOT-23 package.
The TPS3813xxx devices are characterized for
operation over a temperature range of –40°C to 85°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS3813xxx
SOT-23 (6)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.


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