M41T81S

批量生产

串行实时时钟(RTC),具有报警功能

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概述
Online design
样片和购买
解决方案
文件
CAD资源
工具与软件
质量与可靠性
开始
Partner products
Sales Briefcase

产品概述

描述

The M41T81S is a low-power serial real-time clock (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 M41T81S 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 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 M41T81S is supplied in either an 8-pin SOIC or an 18-pin 300 mil SOIC package which includes an embedded 32 KHz crystal.
The 18-pin, embedded crystal SOIC requires only a user-supplied battery to provide non-volatile operation.
  • 所有功能

    • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
    • 32 KHz crystal oscillator with integrated load capacitance (12.5 pf) which provides exceptional oscillator stability and high crystal series resistance operation)
    • Oscillator stop detection (monitors clock operation)
    • Serial interface supports I2C bus (400 kHz protocol)
    • Ultra-low battery supply current of 0.6 μA (typ)
    • 2.0 to 5.5 V clock operating voltage
    • Automatic switchover and deselect circuitry (fixed reference) which provides full operation in 3.0 V applications)
    • VCC= 2.7 to 5.5 V
    • 2.5 V ≤ VPFD≤ 2.7 V
    • Power-down time-stamp (HT bit) which allows determination of time elapsed in battery backup
    • Battery low flag
    • 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 for crystal deviation due to temperature)
    • Operating temperature of –40 to 85 °C
    • Package options include an 8-lead SOIC or 18-lead embedded crystal SOIC

电路原理图

特别推荐

All tools & software

    • 产品型号
      状态
      描述
      类型
      供应商

      STSW-SRTC001

      批量生产

      串行RTC的I2C代码

      时钟与定时电路软件 ST
      STSW-SRTC001

      描述:

      串行RTC的I2C代码

      STSW-SRTC002

      批量生产

      SPI代码 - 串行RTC

      时钟与定时电路软件 ST
      STSW-SRTC002

      描述:

      SPI代码 - 串行RTC

EDA Symbols, Footprints and 3D Models

STMicroelectronics - M41T81S

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.

Symbols

Symbols

Footprints

Footprints

3D model

3D models

质量与可靠性

产品型号 Marketing Status 封装 等级规格 符合RoHS级别 材料声明**
M41T81SM6F
批量生产
SO-8 工业 Ecopack1
M41T81SMY6F
批量生产
SO18 with embedded crystal 工业 Ecopack1

M41T81SM6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T81SMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此,它们可能不是100%适用于特定的设备。有关特定设备的信息,请联系 销售支持

样片和购买

产品型号
从分销商订购
从ST订购
供货状态
ECCN (US)
ECCN (EU)
包装类型
封装
温度(ºC) Budgetary Price (US$)*/Qty
更多信息
最小值
最大值
M41T81SM6F Available at 4 distributors

经销商的可用性M41T81SM6F

代理商名称
地区 库存 最小订购量 第三方链接
DIGIKEY WORLDWIDE 589 1 马上订购
RS COMPONENTS EUROPE 5775 5 马上订购
AVNET AMERICA 20 0 马上订购
FUTURE WORLDWIDE 4353 1 马上订购

代理商库存报告日期: 2021-04-16

代理商名称

DIGIKEY

库存

589

Min.Order

1

地区

WORLDWIDE 马上订购

RS COMPONENTS

库存

5775

Min.Order

5

地区

EUROPE 马上订购

AVNET

库存

20

Min.Order

0

地区

AMERICA 马上订购

FUTURE

库存

4353

Min.Order

1

地区

WORLDWIDE 马上订购

代理商库存报告日期: 2021-04-16

批量生产
EAR99 NEC Tape And Reel SO-8 -40 85 1.106 / 1k
更多信息

NVRAM size (B):

-

Country of Origin:

MOROCCO

M41T81SMY6F Available at 3 distributors

经销商的可用性M41T81SMY6F

代理商名称
地区 库存 最小订购量 第三方链接
DIGIKEY WORLDWIDE 1765 1 马上订购
Newark Element14 AMERICA 852 0 马上订购
MOUSER WORLDWIDE 1971 1 马上订购

代理商库存报告日期: 2021-04-16

代理商名称

DIGIKEY

库存

1765

Min.Order

1

地区

WORLDWIDE 马上订购

Newark Element14

库存

852

Min.Order

0

地区

AMERICA 马上订购

MOUSER

库存

1971

Min.Order

1

地区

WORLDWIDE 马上订购

代理商库存报告日期: 2021-04-16

Free Sample Buy Direct
批量生产
EAR99 NEC Tape And Reel SO18 with embedded crystal -40 85
更多信息

NVRAM size (B):

-

Country of Origin:

PHILIPPINES

M41T81SM6F

供货状态

批量生产

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.106 / 1k

经销商的可用性M41T81SM6F

代理商名称
地区 库存 最小订购量 第三方链接
DIGIKEY WORLDWIDE 589 1 马上订购
RS COMPONENTS EUROPE 5775 5 马上订购
AVNET AMERICA 20 0 马上订购
FUTURE WORLDWIDE 4353 1 马上订购

代理商库存报告日期: 2021-04-16

代理商名称

DIGIKEY

库存

589

Min.Order

1

地区

WORLDWIDE 马上订购

RS COMPONENTS

库存

5775

Min.Order

5

地区

EUROPE 马上订购

AVNET

库存

20

Min.Order

0

地区

AMERICA 马上订购

FUTURE

库存

4353

Min.Order

1

地区

WORLDWIDE 马上订购

代理商库存报告日期: 2021-04-16

ECCN (EU)

NEC

包装类型

Tape And Reel

封装

SO-8

Operating Temperature (°C)

(最小值)

-40

(最大值)

85

Budgetary Price (US$)* / Qty

1.106 / 1k

NVRAM size (B)

-

Country of Origin

MOROCCO

M41T81SMY6F

供货状态

批量生产

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

经销商的可用性M41T81SMY6F

代理商名称
地区 库存 最小订购量 第三方链接
DIGIKEY WORLDWIDE 1765 1 马上订购
Newark Element14 AMERICA 852 0 马上订购
MOUSER WORLDWIDE 1971 1 马上订购

代理商库存报告日期: 2021-04-16

代理商名称

DIGIKEY

库存

1765

Min.Order

1

地区

WORLDWIDE 马上订购

Newark Element14

库存

852

Min.Order

0

地区

AMERICA 马上订购

MOUSER

库存

1971

Min.Order

1

地区

WORLDWIDE 马上订购

代理商库存报告日期: 2021-04-16

ECCN (EU)

NEC

包装类型

Tape And Reel

封装

SO18 with embedded crystal

Operating Temperature (°C)

(最小值)

-40

(最大值)

85

Budgetary Price (US$)* / Qty

NVRAM size (B)

-

Country of Origin

PHILIPPINES

(*) 建议转售单价(美元)仅用于预算用途。如需以当地货币计价的报价,请联系您当地的 ST销售办事处 或我们的 经销商