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
All tools & software
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Part number Status Description Type Supplier Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu STSW-SRTC001
ActiveI2C code for Serial RTC
Clocks and timers software ST Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu STSW-SRTC002
ActiveSPI code -Serial RTC
Clocks and timers software ST
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All resources
Resource title | Version | Latest update |
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Product Specifications (1)
Resource title | Version | Latest update | ||
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8.0 | 19 Sep 2016 | 19 Sep 2016 |
Application Notes (5 of 11)
Resource title | Version | Latest update | ||
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3.0 | 13 Sep 2018 | 13 Sep 2018 | ||
4.0 | 15 Feb 2015 | 15 Feb 2015 | ||
2.1 | 03 Apr 2013 | 03 Apr 2013 | ||
4.1 | 31 Oct 2024 | 31 Oct 2024 | ||
2.0 | 31 Oct 2024 | 31 Oct 2024 | ||
1.0 | 14 May 2015 | 14 May 2015 | ||
4.0 | 31 Oct 2024 | 31 Oct 2024 | ||
2.0 | 03 Apr 2013 | 03 Apr 2013 | ||
2.0 | 10 Oct 2022 | 10 Oct 2022 | ||
4.1 | 10 Oct 2022 | 10 Oct 2022 | ||
1.2 | 04 Sep 2015 | 04 Sep 2015 |
Brochures (1)
Resource title | Version | Latest update | ||
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1.0 | 09 Jun 2023 | 09 Jun 2023 |
EDA Symbols, Footprints and 3D Models
STMicroelectronics - M41T93
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
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Symbols
Footprints
3D models
Quality and Reliability
Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
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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 | |
Marketing Status
Package
SO18 with embedded crystal
Grade
Industrial
RoHS Compliance Grade
Ecopack1
Marketing Status
Package
VFQFPN 16 4x4x1.0
Grade
Industrial
RoHS Compliance Grade
Ecopack2
Marketing Status
Package
SO18 with embedded crystal
Grade
Industrial
RoHS Compliance Grade
Ecopack1
Marketing Status
Package
VFQFPN 16 4x4x1.0
Grade
Industrial
RoHS Compliance Grade
Ecopack2
Marketing Status
Package
SO18 with embedded crystal
Grade
Industrial
RoHS Compliance Grade
Ecopack1
Marketing Status
Package
VFQFPN 16 4x4x1.0
Grade
Industrial
RoHS Compliance Grade
Ecopack2
(**) 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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min | max | |||||||||||||||||||||||||||||||||||||||||||
M41T93RQA6F | Active | 1.6746 / 1k | Available at 2 distributors Distributor availability of M41T93RQA6F
Distributor reported inventory date: 1/10/2025 | | | | Buy from Distributor | | VFQFPN 16 4x4x1.0 | Tape and Reel | MALAYSIA | EAR99 | NEC | -40 | 85 | 7 | ||||||||||||||||||||||||||||
M41T93ZMY6F | Active | 2.4695 / 1k | Available at 2 distributors Distributor availability of M41T93ZMY6F
Distributor reported inventory date: 1/10/2025 | | | | Buy from Distributor | | SO18 with embedded crystal | Tape and Reel | PHILIPPINES | EAR99 | NEC | -40 | 85 | 7 | ||||||||||||||||||||||||||||
M41T93RMY6F | Active | 2.3695 / 1k | Available at 2 distributors Distributor availability of M41T93RMY6F
Distributor reported inventory date: 1/10/2025 | | | | Buy from Distributor | | SO18 with embedded crystal | Tape and Reel | PHILIPPINES | EAR99 | NEC | -40 | 85 | 7 | ||||||||||||||||||||||||||||
M41T93SMY6F | Active | 2.2695 / 1k | Available at 2 distributors Distributor availability of M41T93SMY6F
Distributor reported inventory date: 1/10/2025 | | | | Buy from Distributor | | SO18 with embedded crystal | Tape and Reel | PHILIPPINES | EAR99 | NEC | -40 | 85 | 7 | ||||||||||||||||||||||||||||
M41T93SQA6F | Active | 1.6746 / 1k | Available at 2 distributors Distributor availability of M41T93SQA6F
Distributor reported inventory date: 1/10/2025 | | | | Buy from Distributor | | VFQFPN 16 4x4x1.0 | Tape and Reel | MALAYSIA | EAR99 | NEC | -40 | 85 | 7 | ||||||||||||||||||||||||||||
M41T93ZQA6F | Active | 1.6746 / 1k | Available at 4 distributors Distributor availability of M41T93ZQA6F
Distributor reported inventory date: 1/10/2025 | | | | Buy from Distributor | | VFQFPN 16 4x4x1.0 | Tape and Reel | MALAYSIA | EAR99 | NEC | -40 | 85 | 7 |
M41T93RQA6F Active
Part Number:
M41T93RQA6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
7
MOUSER
Stock
654Min.Order
1DIGIKEY
Stock
2737Min.Order
1Distributor reported inventory date: 1/10/2025
Stock
Min.Order
M41T93ZMY6F Active
Part Number:
M41T93ZMY6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
7
MOUSER
Stock
932Min.Order
1DIGIKEY
Stock
5468Min.Order
1Distributor reported inventory date: 1/10/2025
Stock
Min.Order
M41T93RMY6F Active
Part Number:
M41T93RMY6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
7
MOUSER
Stock
3848Min.Order
1DIGIKEY
Stock
8712Min.Order
1Distributor reported inventory date: 1/10/2025
Stock
Min.Order
M41T93SMY6F Active
Part Number:
M41T93SMY6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
7
MOUSER
Stock
1609Min.Order
1DIGIKEY
Stock
3765Min.Order
1Distributor reported inventory date: 1/10/2025
Stock
Min.Order
M41T93SQA6F Active
Part Number:
M41T93SQA6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
7
MOUSER
Stock
841Min.Order
1DIGIKEY
Stock
618Min.Order
1Distributor reported inventory date: 1/10/2025
Stock
Min.Order
M41T93ZQA6F Active
Part Number:
M41T93ZQA6F
Operating Temperature (°C)
Min:
-40
Max:
85
NVRAM size (B):
7
MOUSER
Stock
1237Min.Order
1FUTURE
Stock
2000Min.Order
0AVNET
Stock
2000Min.Order
0DIGIKEY
Stock
7717Min.Order
1Distributor reported inventory date: 1/10/2025
Stock
Min.Order
(*) 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