M41T83

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Serial I²C bus real-time clock (RTC) with battery switchover

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Product overview

Description

The M41T8x are low-power serial I2C real-time clocks (RTCs) with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 and SO8 packages, embedded crystal for the SOX18 package). Eight bytes of the register map (see Table 2 on page 23) 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 two-line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T8x 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, two alarm interrupts, 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 M41T83 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. The M41T82 is available only in an SO8 package.
  • All features

    • Ultra-low battery supply current of 365 nA
    • Factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18)
      • Much better accuracies 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)
      • M41T83S: VCC= 3.00 V to 5.50 V
      • M41T83R: VCC= 2.70 V to 5.50 V
      • M41T83Z: VCC= 2.38 V to 5.50 V
    • Serial interface supports I2C bus (400 kHz protocol)
    • 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 (M41T83 only)
    • 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 SuperCap™ backup
    • Operating temperature of –40 °C to 85 °C
    • Package options
      • a 16-lead QFN (M41T83)
      • an 8-lead SOIC (M41T82) or
      • an 18-lead embedded crystal SOIC (M41T83)
    • RoHS compliance: lead-free components are compliant with the RoHS directive

Circuit Diagram

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STMicroelectronics - M41T83

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T83RMY6F
Active
SO18 with embedded crystal Industrial Ecopack1
M41T83RQA6F
Active
VFQFPN 16 4x4x1.0 Industrial Ecopack2
M41T83SMY6F
Active
SO18 with embedded crystal Industrial Ecopack1
M41T83SQA6F
Active
VFQFPN 16 4x4x1.0 Industrial Ecopack2
M41T83ZMY6F
Active
SO18 with embedded crystal Industrial Ecopack1
M41T83ZQA6F
Active
VFQFPN 16 4x4x1.0 Industrial Ecopack2

M41T83RMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T83RQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T83SMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T83SQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T83ZMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T83ZQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

PDF XML

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.

Sample & Buy

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ECCN (EU)
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Temperature (°C) Budgetary Price (US$)*/Qty
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min
max
M41T83SMY6F Available at 4 distributors

Distributor availability ofM41T83SMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 883 1 Order Now
Newark Element14 AMERICA 31 0 Order Now
MOUSER WORLDWIDE 465 1 Order Now
Farnell Element14 EUROPE 1590 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

883

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

31

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

465

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1590

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO18 with embedded crystal -40 85 2.1615 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

PHILIPPINES

M41T83ZMY6F Available at 3 distributors

Distributor availability ofM41T83ZMY6F

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 60 0 Order Now
MOUSER WORLDWIDE 2195 1 Order Now
Farnell Element14 EUROPE 1120 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

Newark Element14

Stock

60

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2195

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1120

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO18 with embedded crystal -40 85 2.1615 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

PHILIPPINES

M41T83RQA6F Available at 3 distributors

Distributor availability ofM41T83RQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 965 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
MOUSER WORLDWIDE 554 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

965

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

MOUSER

Stock

554

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel VFQFPN 16 4x4x1.0 -40 85 1.4498 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

MALAYSIA

M41T83ZQA6F Available at 2 distributors

Distributor availability ofM41T83ZQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17 1 Order Now
Farnell Element14 EUROPE 45 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

DIGIKEY

Stock

17

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

45

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

Active
EAR99 NEC Tape And Reel VFQFPN 16 4x4x1.0 -40 85 1.4498 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

MALAYSIA

M41T83SQA6F Available at 4 distributors

Distributor availability ofM41T83SQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1826 1 Order Now
RS COMPONENTS EUROPE 400 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
MOUSER WORLDWIDE 1341 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

1826

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

400

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

MOUSER

Stock

1341

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel VFQFPN 16 4x4x1.0 -40 85 1.4498 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

MALAYSIA

M41T83RMY6F Available at 4 distributors

Distributor availability ofM41T83RMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10424 1 Order Now
AVNET AMERICA 2000 0 Order Now
MOUSER WORLDWIDE 56 1 Order Now
Farnell Element14 EUROPE 3489 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

10424

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

56

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3489

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO18 with embedded crystal -40 85 2.1615 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

PHILIPPINES

M41T83SMY6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.1615 / 1k

Distributor availability ofM41T83SMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 883 1 Order Now
Newark Element14 AMERICA 31 0 Order Now
MOUSER WORLDWIDE 465 1 Order Now
Farnell Element14 EUROPE 1590 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

883

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

31

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

465

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1590

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO18 with embedded crystal

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

2.1615 / 1k

NVRAM size (B)

7

Country of Origin

PHILIPPINES

M41T83ZMY6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.1615 / 1k

Distributor availability ofM41T83ZMY6F

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 60 0 Order Now
MOUSER WORLDWIDE 2195 1 Order Now
Farnell Element14 EUROPE 1120 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

Newark Element14

Stock

60

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2195

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1120

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO18 with embedded crystal

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

2.1615 / 1k

NVRAM size (B)

7

Country of Origin

PHILIPPINES

M41T83RQA6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.4498 / 1k

Distributor availability ofM41T83RQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 965 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
MOUSER WORLDWIDE 554 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

965

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

MOUSER

Stock

554

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 4x4x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.4498 / 1k

NVRAM size (B)

7

Country of Origin

MALAYSIA

M41T83ZQA6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.4498 / 1k

Distributor availability ofM41T83ZQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17 1 Order Now
Farnell Element14 EUROPE 45 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

DIGIKEY

Stock

17

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

45

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 4x4x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.4498 / 1k

NVRAM size (B)

7

Country of Origin

MALAYSIA

M41T83SQA6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.4498 / 1k

Distributor availability ofM41T83SQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1826 1 Order Now
RS COMPONENTS EUROPE 400 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
MOUSER WORLDWIDE 1341 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

1826

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

400

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

MOUSER

Stock

1341

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 4x4x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.4498 / 1k

NVRAM size (B)

7

Country of Origin

MALAYSIA

M41T83RMY6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.1615 / 1k

Distributor availability ofM41T83RMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10424 1 Order Now
AVNET AMERICA 2000 0 Order Now
MOUSER WORLDWIDE 56 1 Order Now
Farnell Element14 EUROPE 3489 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

10424

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

56

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3489

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO18 with embedded crystal

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

2.1615 / 1k

NVRAM size (B)

7

Country of Origin

PHILIPPINES

(*) 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