5.0 V, 3.3/3.0 V secure real-time clock , NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

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  • The M41ST87Y/W secure serial RTC and NVRAM supervisor is a low power 1280-bit, static CMOS SRAM organized as 160 bytes by 8 bits. A built-in 32.768 kHz oscillator (internal crystal-controlled) and 8 bytes of the SRAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format.

    An additional 11 bytes of RAM provide calibration, status/control of alarm, watchdog, tamper, and square wave functions. 8 bytes of ROM and finally 128 bytes of user RAM are also provided. 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 M41ST87Y/W 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, tamper detection, 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), 30 and 31 day months are made automatically.

    主要特性

    • 5.0, 3.3, or 3.0 V operation
    • 400 kHz I2C bus
    • NVRAM supervisor to non-volatize external LPSRAM
    • 2.5 to 5.5 V oscillator operating voltage
    • Automatic switchover and deselect circuitry
    • Choice of power-fail deselect voltages
      • M41ST87Y: (not recommended for new design, contact ST sales office for availability) THS = 1: VPFD≈ 4.63 V; VCC= 4.75 to 5.5 V THS = 0: VPFD≈ 4.37 V; VCC= 4.5 to 5.5 V
      • M41ST87W: THS = 1: VPFD≈ 2.9 V; VCC= 3.0 to 3.6 V THS = 0: VPFD≈ 2.63 V; VCC= 2.7 to 3.6 V
    • Two independent power-fail comparators (1.25 V reference)
    • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
    • 128 bytes of clearable, general purpose NVRAM
    • Programmable alarm and interrupt function (valid even during battery backup mode)
    • Programmable watchdog timer
    • Unique electronic serial number (8-byte)
    • 32 kHz frequency output available upon power-on
    • Microprocessor power-on reset output
    • Battery low flag
    • Ultra-low battery supply current of 500 nA (typ)
    • Security features
      • Tamper indication circuits with timestamp and RAM clear
      • LPSRAM clear function (TPCLR)
      • Packaging includes a 28-lead, embedded crystal SOIC and a 20-lead SSOP
      • Oscillator stop detection

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样片和购买

产品型号
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包装类型
温度(ºC) 供货状态
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NVRAM size (B)
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从ST订购
min
max
M41ST87WMX6TR SO28 WITH EMBEDDED CRYSTAL Tape And Reel -40 85
Active
3.94 10000 128
更多信息

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

查看供货情况

Distributor availability ofM41ST87WMX6TR

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DIGIKEY WORLDWIDE 123 1 Order Now
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ARROW EUROPE 1000 0 Order Now
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MOUSER WORLDWIDE 214 1 Order Now

代理商库存报告日期: 2019-09-18

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214

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1

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代理商库存报告日期: 2019-09-18

Get sample
M41ST87WSS6F SSOP 20 7.2x5.3 Tape And Reel -40 85
Active
- - 128
更多信息

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

查看供货情况

Distributor availability ofM41ST87WSS6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 3758 1 Order Now
RS COMPONENTS EUROPE 1340 1 Order Now
ARROW EUROPE 1350 0 Order Now
ARROW AMERICA 4050 1350 Order Now
MOUSER WORLDWIDE 2438 1 Order Now
ANGLIA Live EUROPE 1000 1 Order Now

代理商库存报告日期: 2019-09-18

代理商名称

DIGIKEY

库存

3758

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

1340

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

1350

Min.Order

0

地区

EUROPE Order Now

ARROW

库存

4050

Min.Order

1350

地区

AMERICA Order Now

MOUSER

库存

2438

Min.Order

1

地区

WORLDWIDE Order Now

ANGLIA Live

库存

1000

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-18

Get sample

M41ST87WMX6TR

封装

SO28 WITH EMBEDDED CRYSTAL

包装类型

Tape And Reel

Unit Price (US$)

3.94*

Distributor availability ofM41ST87WMX6TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 123 1 Order Now
RS COMPONENTS EUROPE 1438 1 Order Now
ARROW EUROPE 1000 0 Order Now
Newark Element14 AMERICA 50 0 Order Now
MOUSER WORLDWIDE 214 1 Order Now

代理商库存报告日期: 2019-09-18

代理商名称

DIGIKEY

库存

123

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

1438

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

1000

Min.Order

0

地区

EUROPE Order Now

Newark Element14

库存

50

Min.Order

0

地区

AMERICA Order Now

MOUSER

库存

214

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-09-18

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

3.94

数量

10000

NVRAM size (B)

128

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M41ST87WSS6F

封装

SSOP 20 7.2x5.3

包装类型

Tape And Reel

Unit Price (US$)

*

Distributor availability ofM41ST87WSS6F

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 3758 1 Order Now
RS COMPONENTS EUROPE 1340 1 Order Now
ARROW EUROPE 1350 0 Order Now
ARROW AMERICA 4050 1350 Order Now
MOUSER WORLDWIDE 2438 1 Order Now
ANGLIA Live EUROPE 1000 1 Order Now

代理商库存报告日期: 2019-09-18

代理商名称

DIGIKEY

库存

3758

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

1340

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

1350

Min.Order

0

地区

EUROPE Order Now

ARROW

库存

4050

Min.Order

1350

地区

AMERICA Order Now

MOUSER

库存

2438

Min.Order

1

地区

WORLDWIDE Order Now

ANGLIA Live

库存

1000

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-18

Operating Temperature (°C)

(min)

-40

(max)

85

供货状态

Active

Unit Price (US$)

-

数量

-

NVRAM size (B)

128

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) 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

适合您的资源

软件

00 选择要下载的文档

技术文档

    • 描述 版本 文档大小 操作
      DS3301
      5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
      11.0
      1.06 MB
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      5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

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      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
      4.0
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      AN1572
      串行实时时钟(RTC)的掉电时间戳功能
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      AN1336
      Power-fail comparator for NVRAM supervisory devices
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      预测NVRAM 和串行RTC 的电池寿命和数据保存期限
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      AN3060

      串行实时时钟(RTC)应用指南

      AN1011

      ST NVRAM 和实时时钟(RTC)产品中使用的电池技术

      AN1879

      如何使用M41ST87W的入侵检测及RAM清除功能

      AN934

      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products

      AN1216

      Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)

      AN4641

      集成TIMEKEEPER® 与实时时钟监控器功能

      AN923

      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs

      AN1572

      串行实时时钟(RTC)的掉电时间戳功能

      AN1336

      Power-fail comparator for NVRAM supervisory devices

      AN1012

      预测NVRAM 和串行RTC 的电池寿命和数据保存期限

硬件型号、CAD库及SVD

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      Ibis model 1.0
      14.7 KB
      ZIP

      Ibis model

出版刊物和宣传资料

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      Serial real-time clock ICs 1.0
      827.11 KB
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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**
M41ST87WMX6TR
Active
SO28 WITH EMBEDDED CRYSTAL 工业 Ecopack1
M41ST87WSS6F
Active
SSOP 20 7.2x5.3 工业 Ecopack2

M41ST87WMX6TR

Package:

SO28 WITH EMBEDDED CRYSTAL

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO28 WITH EMBEDDED CRYSTAL

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41ST87WSS6F

Package:

SSOP 20 7.2x5.3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SSOP 20 7.2x5.3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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.