SR1

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Design Win

4 pin Smart Reset

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Product overview

Description

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.
  • All 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)

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STMicroelectronics - SR1

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Footprints

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3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SR1CARU
Active
UFDFPN 1X1.45X0.6 6L PITCH0.5 Industrial Ecopack3
SR1HARU
Active
UFDFPN 1X1.45X0.6 6L PITCH0.5 Industrial Ecopack3
SR1LARU
Active
UFDFPN 1X1.45X0.6 6L PITCH0.5 Industrial Ecopack3
SR1PAAU
Active
UFDFPN 1X1.45X0.6 6L PITCH0.5 Industrial Ecopack3
SR1PARU
Active
UFDFPN 1X1.45X0.6 6L PITCH0.5 Industrial Ecopack3
SR1PBBU
Active
UFDFPN 1X1.45X0.6 6L PITCH0.5 Industrial Ecopack3

SR1CARU

Package:

UFDFPN 1X1.45X0.6 6L PITCH0.5

Material Declaration**:

Marketing Status

Active

Package

UFDFPN 1X1.45X0.6 6L PITCH0.5

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR1HARU

Package:

UFDFPN 1X1.45X0.6 6L PITCH0.5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

UFDFPN 1X1.45X0.6 6L PITCH0.5

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR1LARU

Package:

UFDFPN 1X1.45X0.6 6L PITCH0.5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

UFDFPN 1X1.45X0.6 6L PITCH0.5

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR1PAAU

Package:

UFDFPN 1X1.45X0.6 6L PITCH0.5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

UFDFPN 1X1.45X0.6 6L PITCH0.5

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR1PARU

Package:

UFDFPN 1X1.45X0.6 6L PITCH0.5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

UFDFPN 1X1.45X0.6 6L PITCH0.5

Grade

Industrial

RoHS Compliance Grade

Ecopack3

SR1PBBU

Package:

UFDFPN 1X1.45X0.6 6L PITCH0.5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

UFDFPN 1X1.45X0.6 6L PITCH0.5

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
SR1PBBU Available at 1 distributors

Distributor availability ofSR1PBBU

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 700 1 Buy from Distributor

Distributor reported inventory date: 2022-08-09

Distributor Name

DIGIKEY

Stock

700

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-08-09

Active
EAR99 NEC Tape and Reel UFDFPN 1X1.45X0.6 6L PITCH0.5 -40 85 240

480

0.4002

PHILIPPINES

SR1HARU No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel UFDFPN 1X1.45X0.6 6L PITCH0.5 -40 85 -

-

0.4002

PHILIPPINES

SR1CARU No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel UFDFPN 1X1.45X0.6 6L PITCH0.5 -40 85 -

-

0.4002

PHILIPPINES

SR1PARU No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel UFDFPN 1X1.45X0.6 6L PITCH0.5 -40 85 -

-

0.4002

PHILIPPINES

SR1PAAU No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel UFDFPN 1X1.45X0.6 6L PITCH0.5 -40 85 140

280

0.4002

PHILIPPINES

SR1LARU Available at 1 distributors

Distributor availability ofSR1LARU

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 5890 1 Buy from Distributor

Distributor reported inventory date: 2022-08-06

Distributor Name

Farnell Element14

Stock

5890

Min.Order

1

Distributor reported inventory date: 2022-08-06

Active
EAR99 NEC Tape and Reel UFDFPN 1X1.45X0.6 6L PITCH0.5 -40 85 -

-

0.4002

PHILIPPINES

SR1PBBU Active

Package:
UFDFPN 1X1.45X0.6 6L PITCH0.5
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR1PBBU

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:

PHILIPPINES

Distributor availability ofSR1PBBU

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 700 1 Buy from Distributor

Distributor reported inventory date: 2022-08-09

Distributor Name

DIGIKEY

Stock

700

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-08-09

SR1HARU Active

Package:
UFDFPN 1X1.45X0.6 6L PITCH0.5
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR1HARU

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:

PHILIPPINES

No availability of distributors reported, please contact our sales office

SR1CARU Active

Package:
UFDFPN 1X1.45X0.6 6L PITCH0.5
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR1CARU

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:

PHILIPPINES

No availability of distributors reported, please contact our sales office

SR1PARU Active

Package:
UFDFPN 1X1.45X0.6 6L PITCH0.5
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR1PARU

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:

PHILIPPINES

No availability of distributors reported, please contact our sales office

SR1PAAU Active

Package:
UFDFPN 1X1.45X0.6 6L PITCH0.5
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR1PAAU

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

Reset pulse width (mS) (min):

140

Reset pulse width (mS) (max):

280

Country of Origin:

PHILIPPINES

No availability of distributors reported, please contact our sales office

SR1LARU Active

Package:
UFDFPN 1X1.45X0.6 6L PITCH0.5
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

SR1LARU

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:

PHILIPPINES

Distributor availability ofSR1LARU

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 5890 1 Buy from Distributor

Distributor reported inventory date: 2022-08-06

Distributor Name

Farnell Element14

Stock

5890

Min.Order

1

Distributor reported inventory date: 2022-08-06

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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