M41T11

Active

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

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Product overview

Description

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”.
  • All 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

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      STSW-SRTC001

      Active

      I2C code for Serial RTC

      Clocks and Timers Software ST
      STSW-SRTC001

      Description:

      I2C code for Serial RTC

      STSW-SRTC002

      Active

      SPI code -Serial RTC

      Clocks and Timers Software ST
      STSW-SRTC002

      Description:

      SPI code -Serial RTC

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STMicroelectronics - M41T11

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T11M6F
Active
SO-8 Industrial Ecopack3
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

Ecopack3

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.

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
M41T11MH6F Available at 1 distributors

Distributor availability ofM41T11MH6F

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 316 1 Buy from Distributor

Distributor reported inventory date: 2021-11-30

Distributor Name

Farnell Element14

Stock

316

Min.Order

1

Distributor reported inventory date: 2021-11-30

Active
EAR99 NEC Tape And Reel SO-28 -40 85 2.7495 / 1k
MORE INFO

NVRAM size (B):

56

Country of Origin:

MALAYSIA

M41T11M6F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape And Reel SO-8 -40 85 1.199 / 1k
MORE INFO

NVRAM size (B):

56

Country of Origin:

MOROCCO

M41T11MH6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.7495 / 1k

Distributor availability ofM41T11MH6F

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 316 1 Buy from Distributor

Distributor reported inventory date: 2021-11-30

Distributor Name

Farnell Element14

Stock

316

Min.Order

1

Distributor reported inventory date: 2021-11-30

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-28

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

2.7495 / 1k

NVRAM size (B)

56

Country of Origin

MALAYSIA

M41T11M6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.199 / 1k

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 (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors