Product overview
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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All 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 μA (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 ≤ VPFD≤ 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 –40 to 85 °C
- Package options include an 8-lead SOIC or 18-lead embedded crystal SOIC
Circuit Diagram
EDA Symbols, Footprints and 3D Models
STMicroelectronics - M41T81S
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Footprints
3D models
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** |
|---|---|---|---|---|---|
| M41T81SM6F | Active | SO-8 | Industrial | Ecopack1 | |
| M41T81SMY6F | Active | SO18 with embedded crystal | Industrial | Ecopack1 |
(**) 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 | Order from distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | NVRAM size (B) | Country of Origin | Budgetary Price (US$)*/Qty | NVRAM size (B) | Country of Origin | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | ||||||||||||||
| M41T81SM6F | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | SO-8 | -40 | 85 | - | MOROCCO | | - | MOROCCO | ||
| M41T81SMY6F | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | SO18 with embedded crystal | -40 | 85 | - | PHILIPPINES | | - | PHILIPPINES | ||
M41T81SMY6F 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