M41T93

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Serial SPI bus real-time clock (RTC) with battery switchover

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  • 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.

    Key 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

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M41T93SMY6F SO18 with embedded crystal Tape And Reel -40 85
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ECCN (US):

EAR99

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MALAYSIA

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M41T93ZQA6F VFQFPN 16 4x4x1.0 Tape And Reel -40 85
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ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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M41T93RQA6F

Package

VFQFPN 16 4x4x1.0

Packing Type

Tape And Reel

Unit Price (US$)

1.318*

Distributor availability ofM41T93RQA6F

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 333 1 Order Now
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ARROW AMERICA 2000 1000 Order Now
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354

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2000

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2000

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1000

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1663

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1380

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Distributor reported inventory date: 2019-12-12

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

1.318

Quantity

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T93ZMY6F

Package

SO18 with embedded crystal

Packing Type

Tape And Reel

Unit Price (US$)

1.965*

Distributor availability ofM41T93ZMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2065 1 Order Now
MOUSER WORLDWIDE 566 1 Order Now
Farnell Element14 EUROPE 930 1 Order Now

Distributor reported inventory date: 2019-12-12

Distributor Name

DIGIKEY

Stock

2065

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

566

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

930

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-12

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

1.965

Quantity

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T93RMY6F

Package

SO18 with embedded crystal

Packing Type

Tape And Reel

Unit Price (US$)

1.965*

Distributor availability ofM41T93RMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4926 1 Order Now
RS COMPONENTS EUROPE 1025 1 Order Now
ARROW AMERICA 8 1 Order Now
MOUSER WORLDWIDE 1150 1 Order Now
Farnell Element14 EUROPE 57 1 Order Now

Distributor reported inventory date: 2019-12-12

Distributor Name

DIGIKEY

Stock

4926

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1025

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

8

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1150

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

57

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-12

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

1.965

Quantity

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T93SMY6F

Package

SO18 with embedded crystal

Packing Type

Tape And Reel

Unit Price (US$)

1.965*

Distributor availability ofM41T93SMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3308 1 Order Now
COMPEL EUROPE 30 1 Order Now
AVNET AMERICA 1000 0 Order Now
MOUSER WORLDWIDE 806 1 Order Now

Distributor reported inventory date: 2019-12-12

Distributor Name

DIGIKEY

Stock

3308

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

30

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

1000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

806

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-12-12

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

1.965

Quantity

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T93SQA6F

Package

VFQFPN 16 4x4x1.0

Packing Type

Tape And Reel

Unit Price (US$)

1.318*

Distributor availability ofM41T93SQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1298 1 Order Now
ARROW EUROPE 1000 0 Order Now
ARROW AMERICA 1236 1 Order Now
MOUSER WORLDWIDE 1622 1 Order Now
Farnell Element14 EUROPE 57 1 Order Now
RUTRONIK EUROPE 1000 1000 Order Now

Distributor reported inventory date: 2019-12-12

Distributor Name

DIGIKEY

Stock

1298

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

1236

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1622

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

57

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1000

Min.Order

1000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-12

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

1.318

Quantity

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T93ZQA6F

Package

VFQFPN 16 4x4x1.0

Packing Type

Tape And Reel

Unit Price (US$)

1.318*

Distributor availability ofM41T93ZQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 784 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
ARROW AMERICA 7 1 Order Now
MOUSER WORLDWIDE 2188 1 Order Now
Farnell Element14 EUROPE 1000 1 Order Now

Distributor reported inventory date: 2019-12-12

Distributor Name

DIGIKEY

Stock

784

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

7

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

2188

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-12

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Unit Price (US$)

1.318

Quantity

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Embedded Software

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Technical Documentation

    • Description Version Size Action
      DS4878
      Serial SPI bus real-time clock (RTC) with battery switchover
      8.0
      1.15 MB
      PDF
      DS4878

      Serial SPI bus real-time clock (RTC) with battery switchover

    • Description Version Size Action
      AN3060
      Applications guide for serial real-time clocks (RTCs)
      3.0
      878.56 KB
      PDF
      AN1011
      Battery technology used in NVRAM and real-time clock (RTC) products from ST
      4.0
      248.17 KB
      PDF
      AN2678
      Extremely accurate timekeeping over temperature using adaptive calibration
      2.1
      214.39 KB
      PDF
      AN934
      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
      4.1
      123.42 KB
      PDF
      AN1216
      Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)
      2.0
      192.89 KB
      PDF
      AN4641
      Integrating TIMEKEEPER® and real-time clock supervisor functions
      1.0
      479.28 KB
      PDF
      AN923
      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
      4.0
      142.23 KB
      PDF
      AN1572
      Power-down time-stamp function in serial real-time clocks (RTCs)
      2.0
      171.31 KB
      PDF
      AN1336
      Power-fail comparator for NVRAM supervisory devices
      2.0
      127.81 KB
      PDF
      AN1012
      Predicting the battery life and data retention period of NVRAMs and serial RTCs
      4.1
      439.45 KB
      PDF
      AN2971
      Using the typical temperature characteristics of 32 KHz crystal to compensate the M41T83 and M41T93 serial real-time clocks
      1.2
      401.74 KB
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      AN3060

      Applications guide for serial real-time clocks (RTCs)

      AN1011

      Battery technology used in NVRAM and real-time clock (RTC) products from ST

      AN2678

      Extremely accurate timekeeping over temperature using adaptive calibration

      AN934

      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products

      AN1216

      Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)

      AN4641

      Integrating TIMEKEEPER® and real-time clock supervisor functions

      AN923

      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs

      AN1572

      Power-down time-stamp function in serial real-time clocks (RTCs)

      AN1336

      Power-fail comparator for NVRAM supervisory devices

      AN1012

      Predicting the battery life and data retention period of NVRAMs and serial RTCs

      AN2971

      Using the typical temperature characteristics of 32 KHz crystal to compensate the M41T83 and M41T93 serial real-time clocks

Publications and Collaterals

    • Description Version Size Action
      Serial real-time clock ICs 1.0
      827.11 KB
      PDF

      Serial real-time clock ICs

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

M41T93RMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T93RQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T93SMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T93SQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T93ZMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T93ZQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

Marketing Status

Active

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.

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