Overview
The M41T56MH6F is a low-power, serial real-time clock (RTC) produced by STMicroelectronics. It features 56 bytes of non-volatile RAM (NVRAM) and is designed for applications requiring precise timekeeping and data storage. The device includes a built-in 32,768 Hz oscillator controlled by an external crystal and supports an I2C bus interface with a 100 kHz protocol. It is particularly notable for its ultra-low battery supply current and automatic power-fail detect and switch circuitry, ensuring continuous operation even during power failures.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 4.5 to 5.5 | V |
| Operating Temperature | -40 to 85 | °C |
| Oscillator Frequency | 32,768 | Hz |
| Crystal Load Capacitance | 12.5 | pF |
| Battery Supply Current | 450 nA (typ at 3 V) | nA |
| NVRAM Size | 56 bytes | bytes |
| Package Type | 8-lead plastic SOIC (SO8) | |
| RoHS Compliance | Ecopack3 |
Key Features
- Counters for seconds, minutes, hours, day, date, month, years, and century
- 32 KHz crystal oscillator integrating load capacitance (12.5 pF) for exceptional oscillator stability
- Serial interface supports I2C bus (100 kHz protocol)
- Ultra-low battery supply current of 450 nA (typ at 3 V)
- 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 range of –40 °C to 85 °C
- RoHS compliant and lead-free second level interconnect
Applications
The M41T56MH6F is suitable for a variety of applications that require accurate timekeeping and data storage, such as:
- Industrial control systems
- Medical devices
- Automotive systems
- Consumer electronics
- IoT devices
- Data loggers and recorders
Q & A
- What is the primary function of the M41T56MH6F?
The M41T56MH6F is a serial real-time clock (RTC) with 56 bytes of NVRAM, designed for precise timekeeping and data storage.
- What is the operating voltage range of the M41T56MH6F?
The operating voltage range is 4.5 to 5.5 volts.
- What type of oscillator does the M41T56MH6F use?
The device uses a 32,768 Hz crystal oscillator controlled by an external crystal.
- What is the typical battery supply current of the M41T56MH6F?
The typical battery supply current is 450 nA at 3 V.
- How does the M41T56MH6F handle power failures?
The device has an automatic power-fail detect and switch circuitry that switches to the battery supply during power failures.
- What is the data retention time with a 50 mAh, 3 V lithium cell?
The typical data retention time is in excess of 10 years.
- What interface does the M41T56MH6F support?
The device supports an I2C bus interface with a 100 kHz protocol.
- What is the operating temperature range of the M41T56MH6F?
The operating temperature range is –40 °C to 85 °C.
- Is the M41T56MH6F RoHS compliant?
Yes, the device is RoHS compliant with an Ecopack3 rating.
- What package type is the M41T56MH6F available in?
The device is available in an 8-lead plastic SOIC (SO8) package.
