M41ST87W

批量生产

5.0 V、3.3/3.0 V安全实时时钟、具有篡改检测功能的NVRAM监控器和128字节可清零NVRAM

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概述
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样片和购买
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质量与可靠性
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产品概述

描述

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.
  • 所有功能

    • 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

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 - M41ST87W

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**
M41ST87WMX6TR
批量生产
SO28 WITH EMBEDDED CRYSTAL 工业 Ecopack1
M41ST87WSS6F
批量生产
SSOP 20 7.2x5.3 工业 Ecopack2

M41ST87WMX6TR

Package:

SO28 WITH EMBEDDED CRYSTAL

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO28 WITH EMBEDDED CRYSTAL

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41ST87WSS6F

Package:

SSOP 20 7.2x5.3

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SSOP 20 7.2x5.3

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

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
M41ST87WMX6TR Available at 2 distributors

经销商的可用性M41ST87WMX6TR

代理商名称
地区 库存 最小订购量 第三方链接
RS COMPONENTS EUROPE 510 1 马上订购
AVNET AMERICA 5000 0 马上订购

代理商库存报告日期: 2021-05-07

代理商名称

RS COMPONENTS

库存

510

Min.Order

1

地区

EUROPE 马上订购

AVNET

库存

5000

Min.Order

0

地区

AMERICA 马上订购

代理商库存报告日期: 2021-05-07

批量生产
EAR99 NEC Tape And Reel SO28 WITH EMBEDDED CRYSTAL -40 85 3.94 / 1k
更多信息

NVRAM size (B):

128

Country of Origin:

PHILIPPINES

M41ST87WSS6F Available at 1 distributors

经销商的可用性M41ST87WSS6F

代理商名称
地区 库存 最小订购量 第三方链接
RS COMPONENTS EUROPE 18 1 马上订购

代理商库存报告日期: 2021-05-04

代理商名称

RS COMPONENTS

库存

18

Min.Order

1

地区

EUROPE 马上订购

代理商库存报告日期: 2021-05-04

批量生产
EAR99 NEC Tape And Reel SSOP 20 7.2x5.3 -40 85
更多信息

NVRAM size (B):

128

Country of Origin:

MALAYSIA

M41ST87WMX6TR

供货状态

批量生产

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

3.94 / 1k

经销商的可用性M41ST87WMX6TR

代理商名称
地区 库存 最小订购量 第三方链接
RS COMPONENTS EUROPE 510 1 马上订购
AVNET AMERICA 5000 0 马上订购

代理商库存报告日期: 2021-05-07

代理商名称

RS COMPONENTS

库存

510

Min.Order

1

地区

EUROPE 马上订购

AVNET

库存

5000

Min.Order

0

地区

AMERICA 马上订购

代理商库存报告日期: 2021-05-07

ECCN (EU)

NEC

包装类型

Tape And Reel

封装

SO28 WITH EMBEDDED CRYSTAL

Operating Temperature (°C)

(最小值)

-40

(最大值)

85

Budgetary Price (US$)* / Qty

3.94 / 1k

NVRAM size (B)

128

Country of Origin

PHILIPPINES

M41ST87WSS6F

供货状态

批量生产

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

经销商的可用性M41ST87WSS6F

代理商名称
地区 库存 最小订购量 第三方链接
RS COMPONENTS EUROPE 18 1 马上订购

代理商库存报告日期: 2021-05-04

代理商名称

RS COMPONENTS

库存

18

Min.Order

1

地区

EUROPE 马上订购

代理商库存报告日期: 2021-05-04

ECCN (EU)

NEC

包装类型

Tape And Reel

封装

SSOP 20 7.2x5.3

Operating Temperature (°C)

(最小值)

-40

(最大值)

85

Budgetary Price (US$)* / Qty

NVRAM size (B)

128

Country of Origin

MALAYSIA

(*) 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