Serial real-time clock (RTC) with alarm

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  • The M41T81 is a low-power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional 12 bytes of SRAM provide status/control of alarm, watchdog and square wave functions. 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 M41T81 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 SRAM and clock operations can be supplied by a small lithium button supply when a power failure occurs.
    Functions available to the user include a non-volatile, time-of-day clock/calendar, alarm interrupts, watchdog timer and programmable square wave output. 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 - valid until year 2100), 30 and 31 day months are made automatically.
    The M41T81 is supplied in an 8-pin SOIC.

    主要特性

    • For all new designs use M41T81S
    • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
    • 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation
    • Serial interface supports I2C bus (400 kHz protocol)
    • Ultra-low battery supply current of 0.6 μA (typ at 3 V)
    • 2.0 to 5.5 V clock operating voltage
    • Automatic switchover and deselect circuitry (for 3 V application select M41T81S datasheet)
    • Power-down time stamp (HT bit) allowing determination of time elapsed in battery backup
    • Programmable alarm and interrupt function (valid even during battery backup mode)
    • Accurate programmable watchdog timer (from 62.5 ms to 128 s)
    • Software clock calibration to compensate crystal deviation due to temperature
    • Operating temperature of –40 to 85 °C
    • ECOPACK®package available

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max
M41T81M6F SO-8 Tape And Reel -40 85
Active
1.106 10000 -
MORE INFO

ECCN (US):

EAR99

Country of Origin:

-

查看供货情况

Distributor availability ofM41T81M6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 5923 1 Order Now
RS COMPONENTS EUROPE 6055 1 Order Now
AVNET AMERICA 57500 0 Order Now
FUTURE WORLDWIDE 4300 1 Order Now
ARROW AMERICA 25000 2500 Order Now
MOUSER WORLDWIDE 7803 1 Order Now

代理商库存报告日期: 2019-07-21

代理商名称

DIGIKEY

库存

5923

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1

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WORLDWIDE Order Now

RS COMPONENTS

库存

6055

Min.Order

1

地区

EUROPE Order Now

AVNET

库存

57500

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

4300

Min.Order

1

地区

WORLDWIDE Order Now

ARROW

库存

25000

Min.Order

2500

地区

AMERICA Order Now

MOUSER

库存

7803

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-07-21

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M41T81M6F

封装

SO-8

包装类型

Tape And Reel

Unit Price (US$)

1.106*

Distributor availability ofM41T81M6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 5923 1 Order Now
RS COMPONENTS EUROPE 6055 1 Order Now
AVNET AMERICA 57500 0 Order Now
FUTURE WORLDWIDE 4300 1 Order Now
ARROW AMERICA 25000 2500 Order Now
MOUSER WORLDWIDE 7803 1 Order Now

代理商库存报告日期: 2019-07-21

代理商名称

DIGIKEY

库存

5923

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

6055

Min.Order

1

地区

EUROPE Order Now

AVNET

库存

57500

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

4300

Min.Order

1

地区

WORLDWIDE Order Now

ARROW

库存

25000

Min.Order

2500

地区

AMERICA Order Now

MOUSER

库存

7803

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-07-21

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

1.106

数量

10000

NVRAM size (B)

-

ECCN (US)

EAR99

Country of Origin

-

(*) 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**
M41T81M6F
Active
SO-8 工业 Ecopack1

M41T81M6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) 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.