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  • The M41T00 is a low power serial real-time clock with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the RAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. Addresses and data are transferred serially via a two-line bidirectional bus. The built-in address register is incremented automatically after each WRITE or READ data byte.

    The M41T00 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. The energy needed to sustain the RAM and clock operations can be supplied from a small lithium coin cell.
    Typical data retention time is in excess of 5 years with a 50 mA/h 3 V lithium cell.
    The M41T00 is supplied in an 8-lead plastic small outline package.

    Key Features

    • For new designs use M41T00S
    • Counters for seconds, minutes, hours, day, month, years, and century
    • 32 kHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation
    • Serial interface supports I2C bus (100 kHz protocol)
    • Ultra low battery supply current of 0.8 μA (typ at 3 V)
    • 2.0 to 5.5 V clock operating voltage
    • Automatic switchover and deselect circuitry (for 3 V application select M41T00S datasheet)
    • Software clock calibration to compensate crystal deviation due to temperature
    • Automatic leap year compensation
    • Operating temperature of -40 to 85 °C

Circuit Diagram

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Technical Documentation

    • Description Version Size Action
      DS1447
      Serial real-time clock
      10.0
      336.2 KB
      PDF
      DS1447

      Serial real-time clock

    • Description Version Size Action
      AN3060
      Applications guide for serial real-time clocks (RTCs)
      3.0
      878.56 KB
      PDF
      AN1011
      Battery technology used in NVRAM and real-time clock (RTC) products from ST
      4.0
      248.17 KB
      PDF
      AN934
      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
      4.1
      123.42 KB
      PDF
      AN4641
      Integrating TIMEKEEPER® and real-time clock supervisor functions
      1.0
      479.28 KB
      PDF
      AN923
      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
      4.0
      142.23 KB
      PDF
      AN1572
      Power-down time-stamp function in serial real-time clocks (RTCs)
      2.0
      171.31 KB
      PDF
      AN1336
      Power-fail comparator for NVRAM supervisory devices
      2.0
      127.81 KB
      PDF
      AN1012
      Predicting the battery life and data retention period of NVRAMs and serial RTCs
      4.1
      439.45 KB
      PDF
      AN922
      Using a Super Cap to back up the M41T56, M41T00, M41T11, M41T81, M41T94, and M41ST84W (16-pin)
      2.1
      84.5 KB
      PDF
      AN3060

      Applications guide for serial real-time clocks (RTCs)

      AN1011

      Battery technology used in NVRAM and real-time clock (RTC) products from ST

      AN934

      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products

      AN4641

      Integrating TIMEKEEPER® and real-time clock supervisor functions

      AN923

      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs

      AN1572

      Power-down time-stamp function in serial real-time clocks (RTCs)

      AN1336

      Power-fail comparator for NVRAM supervisory devices

      AN1012

      Predicting the battery life and data retention period of NVRAMs and serial RTCs

      AN922

      Using a Super Cap to back up the M41T56, M41T00, M41T11, M41T81, M41T94, and M41ST84W (16-pin)

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      Ibis model 1.0
      8.28 KB
      ZIP

      Ibis model

Publications and Collaterals

    • Description Version Size Action
      Serial real-time clock ICs 1.0
      827.11 KB
      PDF

      Serial real-time clock ICs

Quality & Reliability

    • Description Version Size Action
      Products Underwriter Laboratories (UL) Information 2.1
      543.21 KB
      PDF

      Products Underwriter Laboratories (UL) Information

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T00M6F
Active
SO-8 Industrial Ecopack1

M41T00M6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) 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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ECCN (US)
ECCN (EU)
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Temperature (°C) Budgetary Price (US$)*/Qty
More info
min
max
M41T00M6F Available at 7 distributors

Distributor availability ofM41T00M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17474 1 Order Now
COMPEL EUROPE 1269 1 Order Now
RS COMPONENTS EUROPE 7830 5 Order Now
FUTURE WORLDWIDE 19619 1 Order Now
ARROW EUROPE 20000 0 Order Now
ARROW AMERICA 42500 2500 Order Now
MOUSER WORLDWIDE 434 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

17474

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1269

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

7830

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

19619

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

20000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

42500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

434

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-10

Buy now
Active
EAR99 NEC Tape And Reel SO-8 -40 85 1.223 / 1k
MORE INFO

NVRAM size (B):

-

Country of Origin:

MOROCCO

M41T00M6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.223 / 1k

Distributor availability ofM41T00M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17474 1 Order Now
COMPEL EUROPE 1269 1 Order Now
RS COMPONENTS EUROPE 7830 5 Order Now
FUTURE WORLDWIDE 19619 1 Order Now
ARROW EUROPE 20000 0 Order Now
ARROW AMERICA 42500 2500 Order Now
MOUSER WORLDWIDE 434 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

17474

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1269

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

7830

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

19619

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

20000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

42500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

434

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-10

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.223 / 1k

NVRAM size (B)

-

Country of Origin

MOROCCO

(*) 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