Circuits. TPS3813K33 Datasheet

TPS3813K33 Datasheet PDF


Part

TPS3813K33

Description

Processor Supervisory Circuits

Manufacture

etcTI

Page 24 Pages
Datasheet
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TPS3813K33 Datasheet
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TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
SLVS331H – DECEMBER 2000 – REVISED JULY 2016
TPS3813xxx Family Processor Supervisory Circuits With Window-Watchdog
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
VDD
0.1 µF
R
0.1 µF
VDD
WDR
RESET
TPS3813
WDT
WDI
CWP
GND
VDD
RESET
µC
I/O
GND
Copyright © 2016, Texas Instruments Incorporated
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.
1
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.

TPS3813K33 Datasheet
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
SLVS331H – DECEMBER 2000 – REVISED JULY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions ...................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Timing Requirements ................................................ 6
7.7 Switching Characteristics .......................................... 6
7.8 Dissipation Ratings ................................................... 7
7.9 Typical Characteristics .............................................. 8
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 10
8.5 Programming........................................................... 11
9 Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Application .................................................. 13
10 Power Supply Recommendations ..................... 15
11 Layout................................................................... 15
11.1 Layout Guidelines ................................................. 15
11.2 Layout Example .................................................... 15
12 Device and Documentation Support ................. 16
12.1 Related Links ........................................................ 16
12.2 Receiving Notification of Documentation Updates 16
12.3 Community Resource............................................ 16
12.4 Trademarks ........................................................... 16
12.5 Electrostatic Discharge Caution ............................ 16
12.6 Glossary ................................................................ 16
13 Mechanical, Packaging, and Orderable
Information ........................................................... 16
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision G (October 2013) to Revision H
Page
• Added ESD Ratings table, Thermal Information table, Feature Description section, Device Functional Modes,
Application and Implementation section, Power Supply Recommendations section, Layout section, Device and
Documentation Support section, and Mechanical, Packaging, and Orderable Information section ..................................... 1
• Changed "Power up reset voltage" to "Power-on rest voltage" in Electrical Characteristics ................................................ 6
• Changed the function table in Device Functional Modes .................................................................................................... 10
• Updated text in Implementing Window-Watchdog Settings section ..................................................................................... 11
Changes from Revision F (August 2012) to Revision G
Page
• Changed voltage from 0.6 V to 1.1 V for bottom figure.......................................................................................................... 7
Changes from Revision E (October 2010) to Revision F
Page
• Changed from Rev E to Rev F, August 2012......................................................................................................................... 1
• Deleted the Pull-up resistor value row in the ROC table........................................................................................................ 5
Changes from Revision D (October 2010) to Revision E
Page
• Added Pull-up resistor value to ROC table for RESET ......................................................................................................... 5
Changes from Revision C (April, 2008) to Revision D
Page
• Updated table pin descriptions ............................................................................................................................................... 4
• Changed external capacitor value recommendations in paragraph 2 of Programmable Window-Watchdog section ......... 11
• Added Power-Up Considerations section............................................................................................................................. 12
2 Submit Documentation Feedback
Copyright © 2000–2016, Texas Instruments Incorporated
Product Folder Links: TPS3813J25 TPS3813L30 TPS3813K33 TPS3813I50


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS3813J25, TPS3813L30, TPS3 813K33, TPS3813I50 SLVS331H – DECEMBE R 2000 – REVISED JULY 2016 TPS3813xxx Family Processor Supervisory Circuits With Window-Watchdog 1 Features •1 W indow-Watchdog With Programmable Delay and Window Ratio • 6-Pin SOT-23 Packa ge • Supply Current of 9 µA (Typical ) • Power-On Reset Generator With a F ixed 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 Usin g DSPs, Microcontrollers, or Microproce ssors • Safety Critical Systems • A utomotive Systems • Heating Systems T ypical Operating Circuit VDD 0.1 µF R 0.1 µF VDD WDR RESET TPS3813 W DT WDI CWP GND VDD RESET µC I/O GN D Copyright © 2016, Texas Instruments Incorporated 3 Description The TPS381 3xxx family of supervisory circuits provide circuit initialization and timing supervision, primari.
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