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

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  • 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.

    主要特性

    • 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

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M41T83SMY6F

封装

SO18 with embedded crystal

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Tape And Reel

Unit Price (US$)

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Distributor availability ofM41T83SMY6F

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(max)

85

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Unit Price (US$)

1.965

数量

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

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M41T83ZMY6F

封装

SO18 with embedded crystal

包装类型

Tape And Reel

Unit Price (US$)

1.965*

Distributor availability ofM41T83ZMY6F

代理商名称
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DIGIKEY WORLDWIDE 1561 1 Order Now
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Operating Temperature (°C)

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-40

(max)

85

供货状态

Active

Unit Price (US$)

1.965

数量

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T83RQA6F

封装

VFQFPN 16 4x4x1.0

包装类型

Tape And Reel

Unit Price (US$)

1.318*

Distributor availability ofM41T83RQA6F

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库存

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代理商库存报告日期: 2019-09-11

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

1.318

数量

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T83ZQA6F

封装

VFQFPN 16 4x4x1.0

包装类型

Tape And Reel

Unit Price (US$)

1.318*

Distributor availability ofM41T83ZQA6F

代理商名称
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DIGIKEY WORLDWIDE 859 1 Order Now
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库存

117

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代理商库存报告日期: 2019-09-11

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

1.318

数量

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T83SQA6F

封装

VFQFPN 16 4x4x1.0

包装类型

Tape And Reel

Unit Price (US$)

1.318*

Distributor availability ofM41T83SQA6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 2383 1 Order Now
RS COMPONENTS EUROPE 705 1 Order Now
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代理商库存报告日期: 2019-09-11

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2383

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库存

705

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3000

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1000

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AMERICA Order Now

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库存

1539

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代理商库存报告日期: 2019-09-11

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

1.318

数量

10000

NVRAM size (B)

12

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T83RMY6F

封装

SO18 with embedded crystal

包装类型

Tape And Reel

Unit Price (US$)

1.965*

Distributor availability ofM41T83RMY6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 6049 1 Order Now
AVNET AMERICA 2000 0 Order Now
Newark Element14 AMERICA 194 0 Order Now
MOUSER WORLDWIDE 1309 1 Order Now
Farnell Element14 EUROPE 1600 1 Order Now

代理商库存报告日期: 2019-09-11

代理商名称

DIGIKEY

库存

6049

Min.Order

1

地区

WORLDWIDE Order Now

AVNET

库存

2000

Min.Order

0

地区

AMERICA Order Now

Newark Element14

库存

194

Min.Order

0

地区

AMERICA Order Now

MOUSER

库存

1309

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1600

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-11

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

1.965

数量

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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产品型号 供货状态 封装 等级规格 符合RoHS级别 材料声明**
M41T83RMY6F
Active
SO18 with embedded crystal 工业 Ecopack1
M41T83RQA6F
Active
VFQFPN 16 4x4x1.0 工业 Ecopack2
M41T83SMY6F
Active
SO18 with embedded crystal 工业 Ecopack1
M41T83SQA6F
Active
VFQFPN 16 4x4x1.0 工业 Ecopack2
M41T83ZMY6F
Active
SO18 with embedded crystal 工业 Ecopack1
M41T83ZQA6F
Active
VFQFPN 16 4x4x1.0 工业 Ecopack2

M41T83RMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

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

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Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T83SQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

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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.