Dual push-button smart reset with push-button controlled output delay

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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 discriminate 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 outputs.
    The STM6520 has two combined delayed Smart Reset™ inputs (SR0, SR1) with two user-selectable delayed Smart Reset™ setup time (tSRC) options of 7.5 s and 12.5 s typ., selected by a dual-state Smart Reset™ DSR input pin. When DSR is connected to ground, tSRC= 7.5 s, when connected to VCC, tSRC= 12.5 s (typ.). There are two reset outputs, both going active simultaneously after both of the Smart Reset™ inputs were held active for the selected tSRC delay time. The outputs remain asserted until either or both inputs go to inactive logic level (for this device the output reset pulse duration is fully push-button controlled, meaning neither fixed nor minimum reset pulse width, nor power-on reset pulse is implemented). The first reset output, RST1, is active-low, open-drain; the second reset output, RST2, is active-high, push-pull. The device fully operates over a broad VCC range 1.65 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

    • Dual Smart Reset™ push-button inputs, with user-selectable extended reset setup delay (by two-state input logic): tSRC = 6, 10 s (min.)
    • Push-button controlled reset pulse duration (no fixed nor minimum pulse width guaranteed)
    • No power-on reset
    • Dual reset outputs
      • RST1- active-low, open-drain
      • RST2 - active-high, push-pull
    • Fixed Smart Reset™ input logic voltage levels
    • Broad operating voltage range 1.65 V to 5.5 V, inactive reset output levels valid down to 1.0 V
    • Low supply current 1.5 μA
    • Operating temperature: –30 °C to +85 °C
    • TDFN8 package: 2 mm x 2 mm x 0.75 mm
    • RoHS compliant

Circuit Diagram

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Part Number
Package
Packing Type
Reset pulse width (mS) (min)
Reset pulse width (mS) (max)
Temperature (°C) Marketing Status
Budgetary Price (US$)*
More info
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min
max
STM6520AQRRDG9F DFN8 2x2x0.75 Tape And Reel - - -30
Active
0.39 1000
MORE INFO

Operating Temperature (°C) (max):

85

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofSTM6520AQRRDG9F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6745 1 Order Now
P&S ASIA/PACIFIC 1050 1 Order Now
MOUSER WORLDWIDE 2745 1 Order Now

Distributor reported inventory date: 2019-07-15

Distributor Name

DIGIKEY

Stock

6745

Min.Order

1

Region

WORLDWIDE Order Now

P&S

Stock

1050

Min.Order

1

Region

ASIA/PACIFIC Order Now

MOUSER

Stock

2745

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-07-15

Buy now

STM6520AQRRDG9F

Package

DFN8 2x2x0.75

Packing Type

Tape And Reel

Unit Price (US$)

0.39*

Distributor availability ofSTM6520AQRRDG9F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6745 1 Order Now
P&S ASIA/PACIFIC 1050 1 Order Now
MOUSER WORLDWIDE 2745 1 Order Now

Distributor reported inventory date: 2019-07-15

Distributor Name

DIGIKEY

Stock

6745

Min.Order

1

Region

WORLDWIDE Order Now

P&S

Stock

1050

Min.Order

1

Region

ASIA/PACIFIC Order Now

MOUSER

Stock

2745

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-07-15

Reset pulse width (mS) (min)

-

Reset pulse width (mS) (max)

-

Operating Temperature (°C)

(min)

-30

Marketing Status

Active

Unit Price (US$)

0.39

Quantity

1000

(max)

85

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) 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

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Technical Documentation

    • Description Version Size Action
      DS6371
      Dual push-button Smart ResetTM with push-button controlled output delay
      6.1
      254.17 KB
      PDF
      DS6371

      Dual push-button Smart ResetTM with push-button controlled output delay

    • Description Version Size Action
      AN3261
      Dual push-button Smart Reset™ devices with user-adjustable setup delays
      1.1
      630.21 KB
      PDF
      AN3261

      Dual push-button Smart Reset™ devices with user-adjustable setup delays

    • Description Version Size Action
      TN0941
      Reset and supervisor ICs: frequently asked questions (FAQ)
      1.0
      328.63 KB
      PDF
      TN0941

      Reset and supervisor ICs: frequently asked questions (FAQ)

Presentations & Training Material

    • Description Version Size Action
      Health and Wellness Mobility Cloud computing
      1.32 MB
      PDF
      ST offering in Wearable - Analog and Mixed Signal Portfolio 3.0
      1.47 MB
      PDF

      Health and Wellness Mobility Cloud computing

      ST offering in Wearable - Analog and Mixed Signal Portfolio

Publications and Collaterals

    • Description Version Size Action
      Resets and supervisors - portfolio overview 1.0
      1.31 MB
      PDF
      Smart Reset ICs dual push-button 1.0
      767.58 KB
      PDF

      Resets and supervisors - portfolio overview

      Smart Reset ICs dual push-button

    • Description Version Size Action
      ST’s solutions for mobile devices 3.2
      2.13 MB
      PDF

      ST’s solutions for mobile devices

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STM6520AQRRDG9F
Active
DFN8 2x2x0.75 Industrial Ecopack3

STM6520AQRRDG9F

Package:

DFN8 2x2x0.75

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN8 2x2x0.75

Grade

Industrial

RoHS Compliance Grade

Ecopack3

(**) 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.