ST Life.augmented

SR1

4 pin Smart Reset
  • active Active

The Smart ResetTMdevices provide a useful feature which ensures that inadvertent short reset push-button closures do not cause system resets. This is done by implementing an extended Smart Reset input delay time (tSRC), which ensures a safe reset and eliminates the need for a specific dedicated reset button.

This reset configuration provides versatility and allows the application to distinguish between a software generated interrupt and a hard system reset. When the input push-button is connected to the microcontroller interrupt input, and is closed for a short time, the processor can only be interrupted. If the system still does not respond properly, continuing to keep the push-button closed for the extended setup time tSRCcauses a hard reset of the processor through the reset output.

The SR1 has one Smart Reset input (SR) with preset delayed Smart Reset setup time (tSRC). The reset output (RST) is asserted after the Smart Reset input is held active for the selected tSRCdelay time. The RSToutput remains asserted either until the SRinput goes to inactive logic level (i.e. neither fixed nor minimum reset pulse width is set) or the output reset pulse duration is fixed for tREC(i.e. factory-programmed). The device fully operates over a broad VCCrange from 2.0 V to 5.5 V.

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Errata Sheet
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Datasheet

Key Features

  • Operating voltage range 2 V to 5.5 V
  • Low supply current 1 μA
  • Integrated test mode
  • Single Smart Reset™ push-button input with fixed extended reset setup delay (tSRC) from 0.5 s to 10 s in 0.5 s steps (typ.), option with internal input pull-up resistor
  • Push-button controlled reset pulse duration
  • Option 1: fully push-button controlled, no fixed or minimum pulse width guaranteed
  • Option 2: defined output reset pulse duration (tREC), factory-programmed
  • Single reset output
  • Active low or active high
  • Push-pull or open drain with optional pull-up resistor
  • Fixed Smart Reset input logic voltage levels
  • Operating temperature: -40 °C to +85 °C
  • UDFN6 package 1.00 mm x 1.45 mm
  • ECOPACK®2 (RoHS compliant, Halogen-Free)

Design Resources

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Technical Documentation

Product Specifications

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DS10240: 4 pin Smart Reset™
2.0 482 KB

Presentations & Training Material

Presentations

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ST offering in Wearable - Analog and Mixed Signal Portfolio
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Publications and Collaterals

Flyer

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Resets and supervisors - portfolio overview
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Brochure

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Analog ICs for wearable devices
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ST’s solutions for mobile devices
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Sample & Buy

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Part Number Marketing StatusPackagePacking TypeReset pulse width (min) Reset pulse width (max) Operating Temperature (min) Operating Temperature (max) Order From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SR1CARUActiveUFDFPN 1X1.45X0.6 6L PITCH0.5Tape And Reel1.28360-4085Free Samples.3Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC5001
DIGIKEYOrder NowWORLDWIDE29001
MOUSEROrder NowWORLDWIDE30001
Ecopack2-
SR1HARUActiveUFDFPN 1X1.45X0.6 6L PITCH0.5Tape And Reel1.28360-4085Free Samples.3Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC5001
DIGIKEYOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE30001
Ecopack2PDF
XML
SR1LARUActiveUFDFPN 1X1.45X0.6 6L PITCH0.5Tape And Reel1.28360-4085Free Samples.3Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC4701
DIGIKEYOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE30001
Ecopack2-
SR1PAAUActiveUFDFPN 1X1.45X0.6 6L PITCH0.5Tape And Reel1.28360-4085Free Samples.3Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC5001
DIGIKEYOrder NowWORLDWIDE28681
MOUSEROrder NowWORLDWIDE30001
Ecopack2PDF
XML
SR1PARUActiveUFDFPN 1X1.45X0.6 6L PITCH0.5Tape And Reel1.28360-4085Free Samples.3Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC5001
DIGIKEYOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE30001
Ecopack2-
SR1PBBUActiveUFDFPN 1X1.45X0.6 6L PITCH0.5Tape And Reel1.28360-4085Free Samples.3Distributor reported inventory date: 2014-12-22
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC5001
DIGIKEYOrder NowWORLDWIDE27201
MOUSEROrder NowWORLDWIDE20001
Ecopack2-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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