Low Power Reset Circuit

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  • STM181x devices are low power reset devices used to monitor power supplies for microcontrollers. They perform a single function: asserting a reset signal whenever VCCsupply voltage drops below a preset value and keeping it asserted until VCChas risen above the preset threshold for a minimum period of time (trec). They provide excellent circuit reliability without additional external components when used with +3.0 V / +3.3 V (STM1815–STM1818), and +5 V (STM1810–STM1813) power supply systems.

    A precision voltage reference and comparator monitors the VCCinput for an out-of-tolerance condition. When an invalid VCCcondition occurs, the reset output (RST) is forced low (or high in the case of RST) and remains asserted for trecafter VCCrises above the reset threshold. The STM1813/1818 also keep reset asserted for trecafter the output is momentarily pulled to ground by an external push-button switch.
    The STM1812 and STM1817 have an active-high, push-pull output. The STM1810 and STM1815 (push-pull) and STM1811, STM1813, STM1816, and STM1818 (open-drain) have an active-low RSToutput. The open-drain devices (STM1811 / STM1813 / STM1816 / STM1818) also have an internal pull-up resistor to VCC. The STM1813 and STM1818 feature a debounced manual reset feature that asserts a reset if the RSTpin is pulled low for more than 1.5 μs. When used to initiate manual reset, RSTdebounces signals from devices such as mechanical switches. For devices with this feature, the release of the external switch triggers the reset period.
    The STM181x devices are guaranteed to output the correct logic state for VCCdown to 1.0 V (0 °C to +105 °C). They also provide a reset comparator designed to ignore fast transients on VCC.
    Reset thresholds are available between +2.55 V and +4.62 V. These small, low power devices are ideal for use in portable equipment. All are available in the space-saving 3-pin SOT23 package, and are specified from –40 °C to +105 °C.

    Key Features

    • Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
    • Four output configurations:
      • Push-pull, active-high (STM1812,1817)
      • Push-pull, active-low (STM1810,1815)
      • Open-drain, active-low (STM1811,1816)
      • Open-drain, active-low with push-button detect (STM1813,1818)
    • Reset pulse width - 100 ms (min.)
    • Low supply current - 4 μA (typ.)
    • Guaranteed assertion down to VCC= 1.0 V (0 °C to 105 °C)
    • Factory-trimmed reset thresholds of 2.55 V, 2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ.)
    • Power supply transient immunity
    • Push-button/manual reset detect (STM1813/1818)
    • Operating temperature: –40 °C to 105 °C
    • ± 2.5% reset threshold accuracy:(–40 °C to 105 °C)
    • Available in the SOT23-3 package
    • Fully compatible with DS181x and MXD181x products.

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Part Number
Package
Packing Type
Voltage Reset 1 (V) (typ)
Voltage Reset 2 (V) (typ)
Temperature (°C) Marketing Status
Budgetary Price (US$)*
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min
max
STM1815SWX7F SOT23 Tape And Reel 2.88 - -40 105
Active
0.35
MORE INFO

Quantity:

1000

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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STM1815RWX7F SOT23 Tape And Reel 2.55 - -40 105
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0.35
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Quantity:

1000

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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STM1815TWX7F SOT23 Tape And Reel 3.06 - -40 105
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0.35
MORE INFO

Quantity:

1000

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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Distributor availability ofSTM1815TWX7F

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Newark Element14 AMERICA 750 0 Order Now
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STM1815SWX7F

Package

SOT23

Packing Type

Tape And Reel

Unit Price (US$)

0.35*

Distributor availability ofSTM1815SWX7F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4361 1 Order Now
RS COMPONENTS EUROPE 920 1 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 2700 1 Order Now
Newark Element14 AMERICA 750 0 Order Now
MOUSER WORLDWIDE 3891 1 Order Now
Farnell Element14 EUROPE 1199 1 Order Now

Distributor reported inventory date: 2019-11-29

Distributor Name

DIGIKEY

Stock

4361

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

920

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

2700

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

750

Min.Order

0

Region

AMERICA Order Now

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Stock

3891

Min.Order

1

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1199

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Distributor reported inventory date: 2019-11-29

Voltage Reset 1 (V) (typ)

2.88

Voltage Reset 2 (V) (typ)

-

Operating Temperature (°C)

(min)

-40

(max)

105

Marketing Status

Active

Unit Price (US$)

0.35

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STM1815RWX7F

Package

SOT23

Packing Type

Tape And Reel

Unit Price (US$)

0.35*

Distributor availability ofSTM1815RWX7F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 410 1 Order Now

Distributor reported inventory date: 2019-11-29

Distributor Name

DIGIKEY

Stock

410

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-11-29

Voltage Reset 1 (V) (typ)

2.55

Voltage Reset 2 (V) (typ)

-

Operating Temperature (°C)

(min)

-40

(max)

105

Marketing Status

Active

Unit Price (US$)

0.35

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STM1815TWX7F

Package

SOT23

Packing Type

Tape And Reel

Unit Price (US$)

0.35*

Distributor availability ofSTM1815TWX7F

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 750 0 Order Now
MOUSER WORLDWIDE 1500 1 Order Now
Farnell Element14 EUROPE 1635 1 Order Now

Distributor reported inventory date: 2019-11-29

Distributor Name

Newark Element14

Stock

750

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1500

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1635

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-11-29

Voltage Reset 1 (V) (typ)

3.06

Voltage Reset 2 (V) (typ)

-

Operating Temperature (°C)

(min)

-40

(max)

105

Marketing Status

Active

Unit Price (US$)

0.35

Quantity

1000

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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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STM1815RWX7F
Active
SOT23 Industrial Ecopack3
STM1815SWX7F
Active
SOT23 Industrial Ecopack3
STM1815TWX7F
Active
SOT23 Industrial Ecopack3

STM1815RWX7F

Package:

SOT23

Material Declaration**:

Marketing Status

Active

Package

SOT23

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STM1815SWX7F

Package:

SOT23

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STM1815TWX7F

Package:

SOT23

Material Declaration**:

Marketing Status

Active

Package

SOT23

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.

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