M41T94

批量生产
Design Win

串行实时时钟(RTC),具有44字节NVRAM和复位功能

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概述
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 M41T94 is a serial real-time clock with 44 bytes of NVRAM and a RESET output. A built-in 32,768 Hz oscillator (external crystal controlled) and 8 bytes of the SRAM (see Table 4 on page 18) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 bytes of RAM provide status/control of alarm, watchdog and square wave functions. Addresses and data are transferred serially via a serial SPI interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T94 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-cell 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. Other features include a power-on reset as well as two additional debounced inputs (RSTIN1and RSTIN2) which can also generate an output reset (RST). 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 ninth clock address location controls user access to the clock information and also stores the clock software calibration setting.
The M41T94 is supplied in either a 16-lead plastic SOIC (requiring user supplied crystal and battery) or a 28-lead SOIC SNAPHAT®package (which integrates both crystal and battery in a single SNAPHAT top). The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery and crystal. The unique design allows the SNAPHAT battery/crystal package to be mounted on top of the SOIC package after the completion of the surface mount process.
Insertion of the SNAPHAT housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface-mounting. The SNAPHAT housing is also keyed to prevent reverse insertion.
The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in tape & reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part number is “M4TXX-BR12SH”.
  • 所有功能

    • 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 peripheral interface (2 MHz SPI)
    • Ultralow battery supply current of 500 nA (max)
    • 2.7 to 5.5 V operating voltage
    • 2.5 to 5.5 V oscillator operating voltage
    • Battery low flag
    • Automatic switchover and deselect circuitry
    • 44 bytes of general purpose RAM
    • Programmable alarm and interrupt function (valid even during battery backup mode)
    • Accurate programmable watchdog timer (from 62.5 ms to 128 s)
    • Microprocessor power-on reset
    • Choice of power-fail deselect voltages (VCC= 2.7 to 5.5 V):
      • THS = VSS; 2.55 V ≤ VPFD≤ 2.70 V
      • THS = VCC; 4.20 V ≤ VPFD≤ 4.50 V
    • Packaging includes a 28-lead SOIC and SNAPHAT®top (to be ordered separately) or 16-lead SOIC
    • 28-lead SOIC package provides direct connection for a SNAPHAT®top which contains the battery and crystal
    • RoHS compliant
      • Lead-free second level interconnect

电路原理图

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符号、封装和3D模型

STMicroelectronics - M41T94

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Symbols

符号

Footprints

封装

3D model

3D模型

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**
M41T94MH6F
批量生产
SO-28 工业 Ecopack1
M41T94MQ6F
批量生产
SO-16 工业 Ecopack2

M41T94MH6F

Package:

SO-28

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-28

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T94MQ6F

Package:

SO-16

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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

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产品型号
Order from distributors
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
NVRAM size (B)
Country of Origin
最小值
最大值
M41T94MH6F Available at 5 distributors

经销商的可用性M41T94MH6F

代理商名称
地区 库存 最小订购量 第三方链接
DIGIKEY WORLDWIDE 2942 1 Buy from Distributor
COMPEL EUROPE 653 1 Buy from Distributor
RS COMPONENTS EUROPE 2334 1 Buy from Distributor
MOUSER WORLDWIDE 2659 1 Buy from Distributor
Farnell Element14 EUROPE 970 1 Buy from Distributor

代理商库存报告日期: 2022-08-03

代理商名称

DIGIKEY

库存

2942

Min.Order

1

地区

WORLDWIDE Buy from Distributor

COMPEL

库存

653

Min.Order

1

RS COMPONENTS

库存

2334

Min.Order

1

MOUSER

库存

2659

Min.Order

1

地区

WORLDWIDE Buy from Distributor

Farnell Element14

库存

970

Min.Order

1

代理商库存报告日期: 2022-08-03

批量生产
EAR99 NEC Tape and Reel SO-28 -40 85

44

MALAYSIA

M41T94MQ6F Available at 2 distributors

经销商的可用性M41T94MQ6F

代理商名称
地区 库存 最小订购量 第三方链接
YOSUN ASIA/PACIFIC 190 1 Buy from Distributor
ANGLIA Live EUROPE 2325 1 Buy from Distributor

代理商库存报告日期: 2022-08-03

代理商名称

YOSUN

库存

190

Min.Order

1

地区

ASIA/PACIFIC Buy from Distributor

ANGLIA Live

库存

2325

Min.Order

1

代理商库存报告日期: 2022-08-03

批量生产
EAR99 NEC Tape and Reel SO-16 -40 85

44

MOROCCO

M41T94MH6F 批量生产

封装:
SO-28
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

产品型号:

M41T94MH6F

ECCN (EU):

NEC

包装类型:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

NVRAM size (B):

44

Country of Origin:

MALAYSIA

经销商的可用性M41T94MH6F

代理商名称
地区 库存 最小订购量 第三方链接
DIGIKEY WORLDWIDE 2942 1 Buy from Distributor
COMPEL EUROPE 653 1 Buy from Distributor
RS COMPONENTS EUROPE 2334 1 Buy from Distributor
MOUSER WORLDWIDE 2659 1 Buy from Distributor
Farnell Element14 EUROPE 970 1 Buy from Distributor

代理商库存报告日期: 2022-08-03

代理商名称

DIGIKEY

库存

2942

Min.Order

1

地区

WORLDWIDE Buy from Distributor

COMPEL

库存

653

Min.Order

1

RS COMPONENTS

库存

2334

Min.Order

1

MOUSER

库存

2659

Min.Order

1

地区

WORLDWIDE Buy from Distributor

Farnell Element14

库存

970

Min.Order

1

代理商库存报告日期: 2022-08-03

M41T94MQ6F 批量生产

封装:
SO-16
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

产品型号:

M41T94MQ6F

ECCN (EU):

NEC

包装类型:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

85

NVRAM size (B):

44

Country of Origin:

MOROCCO

经销商的可用性M41T94MQ6F

代理商名称
地区 库存 最小订购量 第三方链接
YOSUN ASIA/PACIFIC 190 1 Buy from Distributor
ANGLIA Live EUROPE 2325 1 Buy from Distributor

代理商库存报告日期: 2022-08-03

代理商名称

YOSUN

库存

190

Min.Order

1

地区

ASIA/PACIFIC Buy from Distributor

ANGLIA Live

库存

2325

Min.Order

1

代理商库存报告日期: 2022-08-03

Swipe or click the button to explore more details Don't show this again

(*) 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