6 pin Smart Reset

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-button 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-button closed for the extended setup time tSRCcauses a hard reset of the processor through the reset output.

The SR2 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 the RSToutput remains asserted either until at least one 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 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.

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

Technical Documentation

Product Specifications
Description Version Size
DS10239 DS10239: 6 pin Smart Reset™ 2.0 464 KB

Presentations & Training Material

Presentations
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Health and Wellness Mobility Cloud computing 1 MB
ST offering in Wearable - Analog and Mixed Signal Portfolio 3.0 1 MB

Publications and Collaterals

Flyers
Description Version Size
Resets and supervisors - portfolio overview 1.0 1 MB
Brochures
Description Version Size
ST’s solutions for mobile devices 3.2 3 MB




Sample & Buy

Part Number Package Packing Type Reset pulse width (mS) (min) Reset pulse width (mS) (max) Operating Temperature (°C) (min) Marketing Status Unit Price (US$) * Quantity Operating Temperature (°C) (max) ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SR2HARU UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
SR2LARU UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
SR2UABU UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
SR2UARU UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
SR2PARU UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
SR2LABU UDFN-6L 1.3X1.6 X0.55,PITCH 0.40 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 MALAYSIA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SR2HARU ActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
SR2LARU ActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
SR2UABU ActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3 0 0
SR2UARU ActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
SR2PARU ActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3 0 0
SR2LABU ActiveUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3 0 0
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(**) 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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