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Product overview

Description

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.

  • All 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)

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STMicroelectronics - SR2

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3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SR2HARU
Active
QFN-6L P 0.4 mm Industrial Ecopack3
SR2LABU
Active
QFN-6L P 0.4 mm Industrial Ecopack3
SR2LARU
Active
QFN-6L P 0.4 mm Industrial Ecopack3
SR2PARU
Active
QFN-6L P 0.4 mm Industrial Ecopack3
SR2UABU
Active
QFN-6L P 0.4 mm Industrial Ecopack3
SR2UARU
Active
QFN-6L P 0.4 mm Industrial Ecopack3

SR2HARU

Package:

QFN-6L P 0.4 mm

Material Declaration**:

Marketing Status

Active

Package

QFN-6L P 0.4 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR2LABU

Package:

QFN-6L P 0.4 mm

Material Declaration**:

Marketing Status

Active

Package

QFN-6L P 0.4 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR2LARU

Package:

QFN-6L P 0.4 mm

Material Declaration**:

Marketing Status

Active

Package

QFN-6L P 0.4 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR2PARU

Package:

QFN-6L P 0.4 mm

Material Declaration**:

Marketing Status

Active

Package

QFN-6L P 0.4 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR2UABU

Package:

QFN-6L P 0.4 mm

Material Declaration**:

PDF XML

Marketing Status

Active

Package

QFN-6L P 0.4 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR2UARU

Package:

QFN-6L P 0.4 mm

Material Declaration**:

PDF XML

Marketing Status

Active

Package

QFN-6L P 0.4 mm

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.

Sample & Buy

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Part Number
Order from distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Reset pulse width (mS) (min)
Budgetary Price (US$)*/Qty
Reset pulse width (mS) (max)
Unit Price (US$)
Country of Origin
min
max
SR2HARU Available at distributors

Distributor availability of SR2HARU

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel QFN-6L P 0.4 mm -40 85 -

-

0.4002

MALAYSIA

SR2LARU Available at distributors

Distributor availability of SR2LARU

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel QFN-6L P 0.4 mm -40 85 -

-

0.4002

MALAYSIA

SR2UABU Available at distributors

Distributor availability of SR2UABU

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel QFN-6L P 0.4 mm -40 85 240

480

0.4002

MALAYSIA

SR2UARU Available at distributors

Distributor availability of SR2UARU

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel QFN-6L P 0.4 mm -40 85 -

-

0.4002

MALAYSIA

SR2PARU Available at distributors

Distributor availability of SR2PARU

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel QFN-6L P 0.4 mm -40 85 -

-

0.4002

MALAYSIA

SR2LABU Available at distributors

Distributor availability of SR2LABU

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel QFN-6L P 0.4 mm -40 85 240

480

0.4002

MALAYSIA

SR2HARU Active

Package:
QFN-6L P 0.4 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR2HARU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

-

Reset pulse width (mS) (max):

-

Country of Origin:

MALAYSIA

SR2LARU Active

Package:
QFN-6L P 0.4 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR2LARU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

-

Reset pulse width (mS) (max):

-

Country of Origin:

MALAYSIA

SR2UABU Active

Package:
QFN-6L P 0.4 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR2UABU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

240

Reset pulse width (mS) (max):

480

Country of Origin:

MALAYSIA

SR2UARU Active

Package:
QFN-6L P 0.4 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR2UARU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

-

Reset pulse width (mS) (max):

-

Country of Origin:

MALAYSIA

Distributor Name

Distributor reported inventory date:

SR2PARU Active

Package:
QFN-6L P 0.4 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR2PARU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

-

Reset pulse width (mS) (max):

-

Country of Origin:

MALAYSIA

Distributor Name

Distributor reported inventory date:

SR2LABU Active

Package:
QFN-6L P 0.4 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR2LABU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

240

Reset pulse width (mS) (max):

480

Country of Origin:

MALAYSIA

Distributor Name

Distributor reported inventory date:

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors