4 pin Smart Reset

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.

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

Technical Documentation

Product Specifications
Description Version Size
DS10240 DS10240: 4 pin Smart Reset™ 2.0 482 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
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Resets and supervisors - portfolio overview 1.0 1 MB
Brochures
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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
SR1PBBU UFDFPN 1X1.45X0.6 6L PITCH0.5 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
SR1HARU UFDFPN 1X1.45X0.6 6L PITCH0.5 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
SR1CARU UFDFPN 1X1.45X0.6 6L PITCH0.5 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
SR1PARU UFDFPN 1X1.45X0.6 6L PITCH0.5 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
SR1PAAU UFDFPN 1X1.45X0.6 6L PITCH0.5 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 PHILIPPINES MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
SR1LARU UFDFPN 1X1.45X0.6 6L PITCH0.5 Tape And Reel 1.28 360 -40 Active 0.3 1000 85 NEC EAR99 PHILIPPINES 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**
SR1PBBU ActiveUFDFPN 1X1.45X0.6 6L PITCH0.5IndustrialEcopack3
SR1HARU ActiveUFDFPN 1X1.45X0.6 6L PITCH0.5IndustrialEcopack3 0 0
SR1CARU ActiveUFDFPN 1X1.45X0.6 6L PITCH0.5IndustrialEcopack3
SR1PARU ActiveUFDFPN 1X1.45X0.6 6L PITCH0.5IndustrialEcopack3
SR1PAAU ActiveUFDFPN 1X1.45X0.6 6L PITCH0.5IndustrialEcopack3 0 0
SR1LARU ActiveUFDFPN 1X1.45X0.6 6L PITCH0.5IndustrialEcopack3
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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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