M41T56 Serial real-time clock (RTC) with 56 bytes NVRAM
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.
技术特性
- 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
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功能框图
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M41T56 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| M41T56M6E |
Active |
|
|
SO-8 |
Tube |
-40 °C-85°C |
M41T56M6E |
| M41T56M6F |
Active |
|
|
SO-8 |
Tape And Reel |
-40 °C-85°C |
M41T56M6F |
DATASHEET
| 描述 |
版本 |
大小 |
| M41T56 : DS1449: Serial real-time clock (RTC) with 56 bytes NVRAM |
9 |
4479KB |
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN922: Using a Super Cap to back up the M41T56, M41T00, M41T11, M41T81, M41T94, and M41ST84W (16-pin) |
2 |
85KB |
| AN923: TIMEKEEPER® rolling into the year 2000 (21st century, Y2K) |
1 |
20KB |
| AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs |
4 |
440KB |
| AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products |
4 |
124KB |
| AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST |
4 |
249KB |
| AN3060: Applications guide for serial real-time clocks |
1 |
355KB |
USER MANUALS
| 描述 |
版本 |
大小 |
| UM0276 : STFPC311 LED evaluation board hardware description and user manual |
2 |
503KB |
