Serial real-time clock (RTC) with 56 bytes of NVRAM

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  • The M41T11 is a low-power serial real-time clock (RTC) with 56 bytes of NVRAM. A built-in 32.768 kHz oscillator (external crystal controlled) and the first 8 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 M41T11 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 M41T11 is supplied in an 8-lead plastic small outline package or 28-lead SNAPHAT® package.
    The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery and crystal. The unique design allows the SNAPHAT battery package to be mounted on top of the SOIC package after the completion of the surface mount process. Insertion of the SNAPHAT housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface-mounting. The SNAPHAT housing is keyed to prevent reverse insertion.
    The SOIC and battery/crystal packages are shipped separately. For the 28-lead SOIC, the battery/crystal package (i.e. SNAPHAT) part number is “M4Txx-BR12SH”.

    Key Features

    • Counters for seconds, minutes, hours, day, date, 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
    • 56 bytes of general purpose RAM
    • Software clock calibration to compensate crystal deviation due to temperature
    • Automatic leap year compensation
    • Operating temperature of –40 to 85°C
    • Packaging includes a 28-lead SOIC and SNAPHAT®top (to be ordered separately; 3.3 V to 5.0 V supply voltage only)
    • RoHS compliant
      • Lead-free second level interconnect

Circuit Diagram

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Part Number
Package
Packing Type
Temperature (°C) Marketing Status
Budgetary Price (US$)*
Quantity
NVRAM size (B)
More info
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min
max
M41T11MH6F SO-28 Tape And Reel -40 85
Active
2.41 10000 56
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofM41T11MH6F

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 526 1 Order Now
RS COMPONENTS EUROPE 907 1 Order Now
AVNET AMERICA 631 0 Order Now
ARROW EUROPE 417 0 Order Now
ARROW AMERICA 54 1 Order Now
MOUSER WORLDWIDE 1430 1 Order Now
Farnell Element14 EUROPE 285 1 Order Now

Distributor reported inventory date: 2019-11-26

Distributor Name

DIGIKEY

Stock

526

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1

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WORLDWIDE Order Now

RS COMPONENTS

Stock

907

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

631

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

417

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

54

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1430

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

285

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-11-26

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M41T11M6F SO-8 Tape And Reel -40 85
Active
- - 56
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MOROCCO

Check Availability

Distributor availability ofM41T11M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7448 1 Order Now
RS COMPONENTS EUROPE 4400 5 Order Now
ARROW EUROPE 32500 0 Order Now
ARROW AMERICA 22500 1 Order Now
MOUSER WORLDWIDE 6516 1 Order Now
ANGLIA Live EUROPE 7993 1 Order Now

Distributor reported inventory date: 2019-11-26

Distributor Name

DIGIKEY

Stock

7448

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4400

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

32500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

22500

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

6516

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

7993

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-11-26

Get sample

M41T11MH6F

Package

SO-28

Packing Type

Tape And Reel

Unit Price (US$)

2.41*

Distributor availability ofM41T11MH6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 526 1 Order Now
RS COMPONENTS EUROPE 907 1 Order Now
AVNET AMERICA 631 0 Order Now
ARROW EUROPE 417 0 Order Now
ARROW AMERICA 54 1 Order Now
MOUSER WORLDWIDE 1430 1 Order Now
Farnell Element14 EUROPE 285 1 Order Now

Distributor reported inventory date: 2019-11-26

Distributor Name

DIGIKEY

Stock

526

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

907

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

631

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

417

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

54

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1430

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

285

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-11-26

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

2.41

Quantity

10000

NVRAM size (B)

56

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T11M6F

Package

SO-8

Packing Type

Tape And Reel

Unit Price (US$)

*

Distributor availability ofM41T11M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7448 1 Order Now
RS COMPONENTS EUROPE 4400 5 Order Now
ARROW EUROPE 32500 0 Order Now
ARROW AMERICA 22500 1 Order Now
MOUSER WORLDWIDE 6516 1 Order Now
ANGLIA Live EUROPE 7993 1 Order Now

Distributor reported inventory date: 2019-11-26

Distributor Name

DIGIKEY

Stock

7448

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4400

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

32500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

22500

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

6516

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

7993

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-11-26

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

-

Quantity

-

NVRAM size (B)

56

ECCN (US)

EAR99

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

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Technical Documentation

    • Description Version Size Action
      DS1448
      Serial real-time clock (RTC) with 56 bytes of NVRAM
      10.0
      225.87 KB
      PDF
      DS1448

      Serial real-time clock (RTC) with 56 bytes of NVRAM

    • 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
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      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

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T11M6F
Active
SO-8 Industrial Ecopack1
M41T11MH6F
Active
SO-28 Industrial Ecopack1

M41T11M6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T11MH6F

Package:

SO-28

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-28

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.

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