Serial real-time clock (RTC) with 44 bytes NVRAM and reset

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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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样片和购买

产品型号
封装
包装类型
温度(ºC) 供货状态
预算价格(US$)
数量
NVRAM size (B)
更多信息
从分销商订购
从ST订购
min
max
M41T94MH6F SO-28 Tape And Reel -40 85
批量生产
2.823 10000 44
更多信息

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

查看供货情况

Distributor availability ofM41T94MH6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 2950 1 Order Now
RS COMPONENTS EUROPE 1854 1 Order Now
FUTURE WORLDWIDE 2808 936 Order Now
ARROW EUROPE 736 0 Order Now
ARROW AMERICA 3 1 Order Now
MOUSER WORLDWIDE 2073 1 Order Now

代理商库存报告日期: 2019-11-28

代理商名称

DIGIKEY

库存

2950

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

1854

Min.Order

1

地区

EUROPE Order Now

FUTURE

库存

2808

Min.Order

936

地区

WORLDWIDE Order Now

ARROW

库存

736

Min.Order

0

地区

EUROPE Order Now

ARROW

库存

3

Min.Order

1

地区

AMERICA Order Now

MOUSER

库存

2073

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-11-28

获取样片
M41T94MQ6F SO-16 Tape And Reel -40 85
批量生产
1.705 10000 44
更多信息

ECCN (US):

EAR99

Country of Origin:

MOROCCO

查看供货情况

Distributor availability ofM41T94MQ6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 5503 1 Order Now
RS COMPONENTS EUROPE 4835 1 Order Now
AVNET AMERICA 18651 0 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW EUROPE 2503 0 Order Now
Newark Element14 AMERICA 217 0 Order Now
MOUSER WORLDWIDE 3489 1 Order Now
Farnell Element14 EUROPE 1148 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

代理商库存报告日期: 2019-11-28

代理商名称

DIGIKEY

库存

5503

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

4835

Min.Order

1

地区

EUROPE Order Now

AVNET

库存

18651

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

2500

Min.Order

2500

地区

WORLDWIDE Order Now

ARROW

库存

2503

Min.Order

0

地区

EUROPE Order Now

Newark Element14

库存

217

Min.Order

0

地区

AMERICA Order Now

MOUSER

库存

3489

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1148

Min.Order

1

地区

EUROPE Order Now

RUTRONIK

库存

2500

Min.Order

2500

地区

EUROPE Order Now

代理商库存报告日期: 2019-11-28

获取样片

M41T94MH6F

封装

SO-28

包装类型

Tape And Reel

单价(US$)

2.823*

Distributor availability ofM41T94MH6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 2950 1 Order Now
RS COMPONENTS EUROPE 1854 1 Order Now
FUTURE WORLDWIDE 2808 936 Order Now
ARROW EUROPE 736 0 Order Now
ARROW AMERICA 3 1 Order Now
MOUSER WORLDWIDE 2073 1 Order Now

代理商库存报告日期: 2019-11-28

代理商名称

DIGIKEY

库存

2950

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

1854

Min.Order

1

地区

EUROPE Order Now

FUTURE

库存

2808

Min.Order

936

地区

WORLDWIDE Order Now

ARROW

库存

736

Min.Order

0

地区

EUROPE Order Now

ARROW

库存

3

Min.Order

1

地区

AMERICA Order Now

MOUSER

库存

2073

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-11-28

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

批量生产

单价(US$)

2.823

数量

10000

NVRAM size (B)

44

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41T94MQ6F

封装

SO-16

包装类型

Tape And Reel

单价(US$)

1.705*

Distributor availability ofM41T94MQ6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 5503 1 Order Now
RS COMPONENTS EUROPE 4835 1 Order Now
AVNET AMERICA 18651 0 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW EUROPE 2503 0 Order Now
Newark Element14 AMERICA 217 0 Order Now
MOUSER WORLDWIDE 3489 1 Order Now
Farnell Element14 EUROPE 1148 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

代理商库存报告日期: 2019-11-28

代理商名称

DIGIKEY

库存

5503

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

4835

Min.Order

1

地区

EUROPE Order Now

AVNET

库存

18651

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

2500

Min.Order

2500

地区

WORLDWIDE Order Now

ARROW

库存

2503

Min.Order

0

地区

EUROPE Order Now

Newark Element14

库存

217

Min.Order

0

地区

AMERICA Order Now

MOUSER

库存

3489

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1148

Min.Order

1

地区

EUROPE Order Now

RUTRONIK

库存

2500

Min.Order

2500

地区

EUROPE Order Now

代理商库存报告日期: 2019-11-28

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

批量生产

单价(US$)

1.705

数量

10000

NVRAM size (B)

44

ECCN (US)

EAR99

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

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产品型号 供货状态 封装 等级规格 符合RoHS级别 Material Declaration**
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 (*)

(**) 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.

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