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  • The M41T56 is a low-power, serial real-time clock (RTC) with 56 bytes of NVRAM. A built-in 32,768 Hz 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 M41T56 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 10 years with a 50 mAh, 3 V lithium cell. The M41T56 is supplied in an 8-lead plastic SOIC package.

    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 450 nA (typ at 3 V)
    • 5 V ±10% supply voltage
    • Timekeeping down to 2.5 V
    • Automatic power-fail detect and switch 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 °C to 85 °C
    • Available in an 8-lead, 150-mil, plastic SOIC (SO8)
    • RoHS compliant
      • Lead-free second level interconnect

Circuit Diagram

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CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T56M6F
Active
SO-8 Industrial Ecopack1

M41T56M6F

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

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Budgetary Price (US$)*/Qty
More info
min
max
M41T56M6F Available at 8 distributors

Distributor availability ofM41T56M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 935 1 Order Now
COMPEL EUROPE 1396 1 Order Now
RS COMPONENTS EUROPE 5510 2 Order Now
AVNET AMERICA 2500 0 Order Now
FUTURE WORLDWIDE 5250 1 Order Now
ARROW EUROPE 45006 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 3415 1 Order Now

Distributor reported inventory date: 2020-09-25

Distributor Name

DIGIKEY

Stock

935

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1396

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

5510

Min.Order

2

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

5250

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

45006

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

3415

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-09-25

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel SO-8 -40 85 1.199 / 1k
MORE INFO

NVRAM size (B):

56

Country of Origin:

MOROCCO

M41T56M6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.199 / 1k

Distributor availability ofM41T56M6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 935 1 Order Now
COMPEL EUROPE 1396 1 Order Now
RS COMPONENTS EUROPE 5510 2 Order Now
AVNET AMERICA 2500 0 Order Now
FUTURE WORLDWIDE 5250 1 Order Now
ARROW EUROPE 45006 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 3415 1 Order Now

Distributor reported inventory date: 2020-09-25

Distributor Name

DIGIKEY

Stock

935

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1396

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

5510

Min.Order

2

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

5250

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

45006

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

3415

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-09-25

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.199 / 1k

NVRAM size (B)

56

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