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  • 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”.

    主要特性

    • 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

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EDA Symbols, Footprints and 3D Models

STMicroelectronics - M41T94

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

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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 Ecopack1 (*)

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

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
M41T94MH6F Available at 8 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 1812 1 马上订购
RS COMPONENTS EUROPE 2994 1 马上订购
AVNET AMERICA 5616 0 马上订购
FUTURE WORLDWIDE 936 936 马上订购
ARROW EUROPE 5110 0 马上订购
ARROW AMERICA 3744 936 马上订购
MOUSER WORLDWIDE 2755 1 马上订购
Farnell Element14 EUROPE 669 1 马上订购

代理商库存报告日期: 2020-11-24

代理商名称

DIGIKEY

库存

1812

Min.Order

1

地区

WORLDWIDE 马上订购

RS COMPONENTS

库存

2994

Min.Order

1

地区

EUROPE 马上订购

AVNET

库存

5616

Min.Order

0

地区

AMERICA 马上订购

FUTURE

库存

936

Min.Order

936

地区

WORLDWIDE 马上订购

ARROW

库存

5110

Min.Order

0

地区

EUROPE 马上订购

ARROW

库存

3744

Min.Order

936

地区

AMERICA 马上订购

MOUSER

库存

2755

Min.Order

1

地区

WORLDWIDE 马上订购

Farnell Element14

库存

669

Min.Order

1

地区

EUROPE 马上订购

代理商库存报告日期: 2020-11-24

Free Sample Buy Direct
批量生产
EAR99 NEC Tape And Reel SO-28 -40 85 2.823 / 1k
更多信息

NVRAM size (B):

44

Country of Origin:

MALAYSIA

M41T94MQ6F Available at 10 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
DIGIKEY WORLDWIDE 4805 1 马上订购
COMPEL EUROPE 12 1 马上订购
RS COMPONENTS EUROPE 3430 1 马上订购
AVNET AMERICA 16000 0 马上订购
FUTURE WORLDWIDE 30000 2500 马上订购
ARROW EUROPE 3 0 马上订购
ARROW AMERICA 2500 2500 马上订购
MOUSER WORLDWIDE 3956 1 马上订购
Farnell Element14 EUROPE 2042 1 马上订购
ANGLIA Live EUROPE 1681 1 马上订购

代理商库存报告日期: 2020-11-24

代理商名称

DIGIKEY

库存

4805

Min.Order

1

地区

WORLDWIDE 马上订购

COMPEL

库存

12

Min.Order

1

地区

EUROPE 马上订购

RS COMPONENTS

库存

3430

Min.Order

1

地区

EUROPE 马上订购

AVNET

库存

16000

Min.Order

0

地区

AMERICA 马上订购

FUTURE

库存

30000

Min.Order

2500

地区

WORLDWIDE 马上订购

ARROW

库存

3

Min.Order

0

地区

EUROPE 马上订购

ARROW

库存

2500

Min.Order

2500

地区

AMERICA 马上订购

MOUSER

库存

3956

Min.Order

1

地区

WORLDWIDE 马上订购

Farnell Element14

库存

2042

Min.Order

1

地区

EUROPE 马上订购

ANGLIA Live

库存

1681

Min.Order

1

地区

EUROPE 马上订购

代理商库存报告日期: 2020-11-24

Free Sample Buy Direct
批量生产
EAR99 NEC Tape And Reel SO-16 -40 85 1.705 / 1k
更多信息

NVRAM size (B):

44

Country of Origin:

MOROCCO

M41T94MH6F

供货状态

批量生产

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.823 / 1k

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 1812 1 马上订购
RS COMPONENTS EUROPE 2994 1 马上订购
AVNET AMERICA 5616 0 马上订购
FUTURE WORLDWIDE 936 936 马上订购
ARROW EUROPE 5110 0 马上订购
ARROW AMERICA 3744 936 马上订购
MOUSER WORLDWIDE 2755 1 马上订购
Farnell Element14 EUROPE 669 1 马上订购

代理商库存报告日期: 2020-11-24

代理商名称

DIGIKEY

库存

1812

Min.Order

1

地区

WORLDWIDE 马上订购

RS COMPONENTS

库存

2994

Min.Order

1

地区

EUROPE 马上订购

AVNET

库存

5616

Min.Order

0

地区

AMERICA 马上订购

FUTURE

库存

936

Min.Order

936

地区

WORLDWIDE 马上订购

ARROW

库存

5110

Min.Order

0

地区

EUROPE 马上订购

ARROW

库存

3744

Min.Order

936

地区

AMERICA 马上订购

MOUSER

库存

2755

Min.Order

1

地区

WORLDWIDE 马上订购

Farnell Element14

库存

669

Min.Order

1

地区

EUROPE 马上订购

代理商库存报告日期: 2020-11-24

ECCN (EU)

NEC

包装类型

Tape And Reel

封装

SO-28

Operating Temperature (°C)

(最小值)

-40

(最大值)

85

Budgetary Price (US$)* / Qty

2.823 / 1k

NVRAM size (B)

44

Country of Origin

MALAYSIA

M41T94MQ6F

供货状态

批量生产

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.705 / 1k

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
DIGIKEY WORLDWIDE 4805 1 马上订购
COMPEL EUROPE 12 1 马上订购
RS COMPONENTS EUROPE 3430 1 马上订购
AVNET AMERICA 16000 0 马上订购
FUTURE WORLDWIDE 30000 2500 马上订购
ARROW EUROPE 3 0 马上订购
ARROW AMERICA 2500 2500 马上订购
MOUSER WORLDWIDE 3956 1 马上订购
Farnell Element14 EUROPE 2042 1 马上订购
ANGLIA Live EUROPE 1681 1 马上订购

代理商库存报告日期: 2020-11-24

代理商名称

DIGIKEY

库存

4805

Min.Order

1

地区

WORLDWIDE 马上订购

COMPEL

库存

12

Min.Order

1

地区

EUROPE 马上订购

RS COMPONENTS

库存

3430

Min.Order

1

地区

EUROPE 马上订购

AVNET

库存

16000

Min.Order

0

地区

AMERICA 马上订购

FUTURE

库存

30000

Min.Order

2500

地区

WORLDWIDE 马上订购

ARROW

库存

3

Min.Order

0

地区

EUROPE 马上订购

ARROW

库存

2500

Min.Order

2500

地区

AMERICA 马上订购

MOUSER

库存

3956

Min.Order

1

地区

WORLDWIDE 马上订购

Farnell Element14

库存

2042

Min.Order

1

地区

EUROPE 马上订购

ANGLIA Live

库存

1681

Min.Order

1

地区

EUROPE 马上订购

代理商库存报告日期: 2020-11-24

ECCN (EU)

NEC

包装类型

Tape And Reel

封装

SO-16

Operating Temperature (°C)

(最小值)

-40

(最大值)

85

Budgetary Price (US$)* / Qty

1.705 / 1k

NVRAM size (B)

44

Country of Origin

MOROCCO

(*) 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