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  • The M41T80 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 registers provide status/control of alarm, 32 KHz output, and square wave functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

    Functions available to the user include a time-of-day clock/calendar, alarm interrupts, 32 KHz output, and programmable square wave output. The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.
    The M41T80 is supplied in an 8-pin SOIC.

    Key Features

    • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, 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 (400 kHz)
    • 2.0 to 5.5 V clock operating voltage
    • 32 KHz square wave on power-up to drive a microcontroller in low-power mode
    • Programmable (1 Hz to 32 KHz) square wave
    • Programmable alarm and interrupt function
    • Low operating current of 200 μA
    • Operating temperature of –40 to 85 °C
    • ECOPACK®package available

Circuit Diagram

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    • Part number
      Status
      Description
      Type
      Supplier

      STSW-SRTC001

      Active

      I2C code for Serial RTC

      Clocks and Timers Software ST

      STSW-SRTC002

      Active

      SPI code -Serial RTC

      Clocks and Timers Software ST
      STSW-SRTC001

      Description:

      I2C code for Serial RTC
      STSW-SRTC002

      Description:

      SPI code -Serial RTC

CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T80M6F
Active
SO-8 Industrial Ecopack1

M41T80M6F

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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Order from Distributors
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Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Budgetary Price (US$)*/Qty
More info
min
max
M41T80M6F Available at 7 distributors

Distributor availability ofM41T80M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2569 1 Order Now
RS COMPONENTS EUROPE 7465 1 Order Now
ARROW EUROPE 3730 0 Order Now
Newark Element14 AMERICA 500 0 Order Now
ARROW AMERICA 5000 2500 Order Now
MOUSER WORLDWIDE 4748 1 Order Now
Farnell Element14 EUROPE 489 1 Order Now

Distributor reported inventory date: 2020-09-27

Distributor Name

DIGIKEY

Stock

2569

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

7465

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3730

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

5000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

4748

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

489

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-27

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel SO-8 -40 85 0.941 / 1k
MORE INFO

NVRAM size (B):

-

Country of Origin:

MOROCCO

M41T80M6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.941 / 1k

Distributor availability ofM41T80M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2569 1 Order Now
RS COMPONENTS EUROPE 7465 1 Order Now
ARROW EUROPE 3730 0 Order Now
Newark Element14 AMERICA 500 0 Order Now
ARROW AMERICA 5000 2500 Order Now
MOUSER WORLDWIDE 4748 1 Order Now
Farnell Element14 EUROPE 489 1 Order Now

Distributor reported inventory date: 2020-09-27

Distributor Name

DIGIKEY

Stock

2569

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

7465

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3730

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

5000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

4748

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

489

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

0.941 / 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