Product overview
Description
The M41T93 is a low-power serial SPI bus real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 package, and embedded crystal for the SOX18 package). Eight bytes of the register map are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM.
Addresses and data are transferred serially via a serial SPI bus-compatible interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T93 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 battery when a power failure occurs.
Functions available to the user include a non-volatile, time-of-day clock/calendar, alarm interrupt, watchdog timer, programmable 8-bit counter, and square wave outputs. 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), 30, and 31 day months are made automatically. The M41T93 is supplied in either a QFN16 or an SOX18, 300 mil SOIC which includes an embedded 32 KHz crystal. The SOX18 package requires only a user-supplied battery to provide non-volatile operation.
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All features
- Ultra-low battery supply current of 365 nA
- Factory calibrated accuracy ±5 ppm typical after 2 reflows (SOX18) (much better accuracies are achievable using built-in programmable analog and digital calibration circuits)
- 2.0 V to 5.5 V clock operating voltage
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- Automatic switchover and reset output circuitry (fixed reference): M41T93S: VCC= 3.0 V to 5.5 V; M41T93R: VCC= 2.7 V to 5.5 V; M41T93Z: VCC= 2.38 V to 5.50 V
- Compatible with SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0])
- Programmable alarm with interrupt function (valid even during battery backup mode)
- Optional 2ndprogrammable alarm available
- Square wave output (defaults to 32 KHz on power-up)
- RESET (RST) output
- Watchdog timer
- Programmable 8-bit counter/timer
- 7 bytes of battery-backed user SRAM
- Battery low flag
- Low operating current of 80 μA
- Oscillator stop detection
- Battery or supercapacitor backup
- Operating temperature of –40 °C to +85 °C
- Package options include a 16-lead QFN and an 18-lead embedded crystal SOIC
Circuit Diagram
EDA Symbols, Footprints and 3D Models
STMicroelectronics - M41T93
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| M41T93RMY6F | Active | SO18 with embedded crystal | Industrial | Ecopack1 | |
| M41T93RQA6F | Active | VFQFPN 16 4x4x1.0 | Industrial | Ecopack2 | |
| M41T93SMY6F | Active | SO18 with embedded crystal | Industrial | Ecopack1 | |
| M41T93SQA6F | Active | VFQFPN 16 4x4x1.0 | Industrial | Ecopack2 | |
| M41T93ZMY6F | Active | SO18 with embedded crystal | Industrial | Ecopack1 | |
| M41T93ZQA6F | Active | VFQFPN 16 4x4x1.0 | Industrial | Ecopack2 | |
M41T93SMY6F
Package:
SO18 with embedded crystalMaterial Declaration**:
M41T93ZMY6F
Package:
SO18 with embedded crystalMaterial Declaration**:
M41T93ZQA6F
Package:
VFQFPN 16 4x4x1.0Material 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) | ||
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| M41T93RQA6F | | | distributors No availability of distributors reported, please contact our sales office |
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| M41T93ZMY6F | | | distributors No availability of distributors reported, please contact our sales office |
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| M41T93RMY6F | | | distributors No availability of distributors reported, please contact our sales office |
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| M41T93SMY6F | | | distributors No availability of distributors reported, please contact our sales office |
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| M41T93SQA6F | | | distributors No availability of distributors reported, please contact our sales office |
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| M41T93ZQA6F | | | distributors No availability of distributors reported, please contact our sales office |
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M41T93RQA6F Active
M41T93ZMY6F Active
M41T93RMY6F Active
M41T93SMY6F Active
M41T93SQA6F Active
M41T93ZQA6F 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