M41T81SM6F Serial I²C RTC with Battery Switchover 200ns Time-Keeping Low 400nA Current 2.5-5.5V Operation Industrial -40°C to +85°C 8-DIP Package Integrated Oscillator and Square Wave Output

M41T81SM6F Serial Iandsup2;C RTC with Battery Switchover 200ns Time-Keeping Low 400nA Current 2.5-5.5V Operation Industrial -40anddeg;C to +85anddeg;C 8-DIP Package Integrated Oscillator andamp; Square Wave Output

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Features

■ Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century

■ 32 KHz crystal oscillator with integrated load capacitance (12.5 pf) which provides exceptional oscillator stability and high crystal series resistance operation)

■ Oscillator stop detection (monitors clock operation)

■ Serial interface supports I2C bus (400 kHz protocol)

■ Ultra-low battery supply current of 0.6 andmicro;A (typ)

■ 2.0 to 5.5 V clock operating voltage

■ Automatic switchover and deselect circuitry (fixed reference) which provides full operation in 3.0 V applications)

■ VCC = 2.7 to 5.5 V

■ 2.5 V andle; VPFD andle; 2.7 V

■ Power-down time-stamp (HT bit) which allows determination of time elapsed in battery backup

■ Battery low flag

■ Programmable alarm and interrupt function (valid even during battery backup mode)

■ Accurate programmable watchdog timer (from 62.5 ms to 128 s)

■ Software clock calibration (to compensate for crystal deviation due to temperature)

■ Operating temperature of andndash;40 to 85 anddeg;C

■ Package options include an 8-lead SOIC or 18-lead embedded crystal SOIC

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Applications

1. Industrial Automation andamp; Control Systems

* Use Cases: Programmable Logic Controllers (PLCs), Industrial PCs (IPCs), Distributed Control Systems (DCS), sensor data loggers.
* Why: Its extended temperature range (-40anddeg;C to +85anddeg;C) and through-hole 8-DIP package make it robust enough for harsh industrial environments, ensuring accurate event time-stamping and logging.

2. Telecommunications andamp; Network Infrastructure
* Use Cases: Routers, switches, base station controllers, Network-Attached Storage (NAS).
* Why: This equipment needs precise timekeeping for synchronizing logs, managing network traffic, and error tracking. Its Iandsup2;C interface allows easy connection to the main processor, and the battery switchover functionality guarantees time is maintained during main power loss.

3. Consumer Electronics andamp; Smart Appliances
* Use Cases: Advanced smart meters, solar inverters, high-end appliances (e.g., ovens, washing machines), Point-of-Sale (POS) terminals.
* Why: The ultra-low power consumption (400nA) is critical for battery-backed devices. For example, in a smart meter, the backup battery can maintain timekeeping during a main power failure thanks to the RTCand#39;s minimal draw, ensuring critical event timing is recorded.

4. Data Logging andamp; Measurement Equipment
* Use Cases: Environmental monitoring stations, vehicle data recorders, scientific instrumentation.
* Why: Providing an accurate timestamp for every data point is essential. The battery switchover feature ensures time is never lost during power outages, and the integrated oscillator simplifies design.

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Description

The M41T81S is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional 12 bytes of SRAM provide status/control of alarm, watchdog and square wave functions. Addresses and data are transferred serially via a two line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

The M41T81S has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button supply when a power failure occurs. Functions available to the user include a non-volatile, time-of day clock/calendar, alarm interrupts, watchdog timer and programmable square wave output. The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.

The M41T81S is supplied in either an 8-pin SOIC or an 18-pin 300 mil SOIC package which includes an embedded 32 KHz crystal.

The 18-pin, embedded crystal SOIC requires only a user-supplied battery to provide non volatile operation.

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INFORMATION

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Drawing

Our advantage :phones, PDAand#39;s, notebook comput.ers

• High quality products --- our offers are 100% new and original, ROHS
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• Professional service --- strict quality testing before the shipment, and perfect after-sales service after the purchase.
• Adequate inventory --- With the support of our strong Purchasing team,
• Fast delivery --- we will ship the goods within 1-3 working days after the payment confirmed.

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