Product overview
Description
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.
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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 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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EDA Symbols, Footprints and 3D Models
STMicroelectronics - M41T56
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All resources
| Resource title | Version | Latest update |
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IBIS models (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| ZIP | 1.0 | 01 Aug 2015 | 01 Aug 2015 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| M41T56M6F | Active | SO-8 | Industrial | Ecopack3 | |
M41T56M6F
Package:
SO-8Material Declaration**:
(**) 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) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | ||||||||||||||
| M41T56M6F | | | distributors No availability of distributors reported, please contact our sales office |
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M41T56M6F Active
(*) 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