SR2:6 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)
Product Specifications
DescriptionVersionSize
DS10239: 6 pin Smart Reset™2.0464 KB
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Sample & Buy
Part NumberPackagePacking TypeReset pulse width (mS) (min)Reset pulse width (mS) (max)Operating Temperature (°C) (min)Unit Price (US$) *QuantityOperating Temperature (°C) (max)ECCN (EU)ECCN (US)Country of Origin
SR2HARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99CHINA
SR2LARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
SR2UABUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
SR2UARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
SR2PARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
SR2LABUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
SR2HARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
SR2LARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
SR2UABUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3md_a0gl-wspc-udfn-6l-wspc-1.3x1.6-wspc-x0.55-wspc-pitch-wspc-0.40_aya4u6baabu-wspc-(sr2uabu)_a_ver2_signed.pdf
md_a0gl-wspc-udfn-6l-wspc-1.3x1.6-wspc-x0.55-wspc-pitch-wspc-0.40_aya4u6baabu-wspc-(sr2uabu)_a_ver2.xml
SR2UARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
SR2PARUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4-wspc-u6baarp.pdf
md_a4-wspc-udfn-6l-wspc-1.xml
SR2LABUUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2_signed.pdf
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2.xml
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md_a0gl-wspc-udfn-6l-wspc-1.3x1.6-wspc-x0.55-wspc-pitch-wspc-0.40_aya4u6baabu-wspc-(sr2uabu)_a_ver2.xml STM6524
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4-wspc-u6baarp.pdf STM6524
md_a4-wspc-udfn-6l-wspc-1.xml STM6524
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2_signed.pdf STM6524
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2.xml STM6524