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Dual push-button Smart Reset
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The Smart Reset™ devices provide a useful feature that ensures inadvertent short reset push-button closures do not cause system resets. This is done by implementing extended Smart Reset™ input delay time (tSRC) and combined push-button inputs, which together 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-buttons are connected to microcontroller interrupt inputs, and are closed for a short time, the processor can only be interrupted. If the system still does not respond properly, continuing to keep the push-buttons closed for the extended setup time tSRCcauses a hard reset of the processor through the reset output.

The STM6524 has two combined delayed Smart Reset™ inputs (SR0,SR1) with preset delayed Smart Reset™ setup time (tSRC). The reset output is asserted after both of the Smart Reset™ inputs were held active for the selected tSRCdelay time. Depending on selected option theRSToutput remains asserted either until at least oneSRinput 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 reset output,RST, is active low or active high, push-pull or open drain with optional pull-up resistor. The device fully operates over a broad VCCrange 1.65 V to 5.5 V. Below 1.575 V typ. the inputs are ignored and outputs are deasserted; the deasserted reset output levels are then valid down to 1.0 V.

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Errata Sheet
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Key Features

  • Operating voltage 1.65 V to 5.5 V
  • Low supply current 1.5 μA
  • Integrated test mode
  • Dual Smart Reset™ push-button inputs with fixed extended reset setup delay (tSRC) from 0.5 s to 10 s in 0.5 s steps (typ.), option with internal 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
  • No power-on reset
  • 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: 1.6 mm x 1.3 mm
  • ECOPACK®2 (RoHS compliant, Halogen-Free)

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS8698: 6-pin Smart Reset™
3.0 268 KB

Technical Notes & Articles

Description Version Size
TN0941: Reset and supervisor ICs: frequently asked questions (FAQ)
1.0 329 KB

Presentations & Training Material


Description Version Size
Health and Wellness Mobility Cloud computing
1,347 KB
ST offering in Wearable - Analog and Mixed Signal Portfolio
3.0 1,508 KB

Publications and Collaterals


Description Version Size
Resets and supervisors - portfolio overview
1,345 KB
Smart Reset ICs dual push-button
1.0 768 KB


Description Version Size
Analog ICs for wearable devices
2.0 981 KB
ST’s solutions for mobile devices
1.0.0 2,217 KB

Sample & Buy

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**
STM6524AHARDL6FActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-4085-.3No availability reported, please contact our Sales officeEcopack2-
STM6524ALABDL6FActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel240480-4085-.3No availability reported, please contact our Sales officeEcopack2-
STM6524ALARDL6FActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-4085-.3No availability reported, please contact our Sales officeEcopack2-
STM6524APARDL6FActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-4085-.3Distributor reported inventory date: 2015-10-10
Distributor NameRegionStockMin. order
STM6524AUABDL6FActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel240480-4085-.3Distributor reported inventory date: 2015-10-10
Distributor NameRegionStockMin. order
STM6524AUARDL6FActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-4085-.3No availability reported, please contact our Sales officeEcopack2-

(*) 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 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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