Product overview
Description
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.
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All 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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I2C code for Serial RTC
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Clocks and timers software ST Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu ActiveSPI code -Serial RTC
Clocks and timers software ST
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All resources
| Resource title | Version | Latest update |
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Product Specifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 10.0 | 19 Jun 2015 | 19 Jun 2015 |
Application Notes (5 of 9)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 3.0 | 13 Sep 2018 | 13 Sep 2018 | ||
| 4.0 | 15 Feb 2015 | 15 Feb 2015 | ||
| 4.1 | 31 Oct 2024 | 31 Oct 2024 | ||
| 1.0 | 14 May 2015 | 14 May 2015 | ||
| 4.0 | 31 Oct 2024 | 31 Oct 2024 | ||
| 2.0 | 03 Apr 2013 | 03 Apr 2013 | ||
| 2.0 | 10 Oct 2022 | 10 Oct 2022 | ||
| 4.1 | 10 Oct 2022 | 10 Oct 2022 | ||
| 2.1 | 21 Jul 2017 | 21 Jul 2017 |
Brochures (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 1.0 | 09 Jun 2023 | 09 Jun 2023 |
Product Certifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 1.0 | 10 Feb 2025 | 10 Feb 2025 |
EDA Symbols, Footprints and 3D Models
STMicroelectronics - M41T00
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IBIS models (1)
| Resource title | Version | Latest update | ||
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| ZIP | 1.0 | 01 Aug 2015 | 01 Aug 2015 |
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| M41T00M6F | Active | SO-8 | Industrial | Ecopack3 |
(**) 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 | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | NVRAM size (B) | |||||||||||||||||||||||||||||||
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| M41T00M6F | Active | 1.461 / 10k | Available at 4 distributors Distributor availability of M41T00M6F
Distributor reported inventory date: 4/16/2025 | | | | Buy from Distributor | | SO-8 | Tape and Reel | MOROCCO | EAR99 | NEC | -40 | 85 |
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M41T00M6F Active
Part Number:
M41T00M6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
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MOUSER
Stock
948Min.Order
1FUTURE
Stock
17500Min.Order
0AVNET
Stock
2500Min.Order
0DIGIKEY
Stock
11229Min.Order
1Distributor reported inventory date: 4/16/2025
Stock
Min.Order
(*) 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