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M41ST85WMX6 from ST,ST Microelectronics

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M41ST85WMX6

Manufacturer: ST

512 Kbit (64 Bit x8) Serial Access RTC and NVRAM Supervisor

Partnumber Manufacturer Quantity Availability
M41ST85WMX6 ST 69 In Stock

Description and Introduction

512 Kbit (64 Bit x8) Serial Access RTC and NVRAM Supervisor The M41ST85WMX6 is a real-time clock (RTC) manufactured by STMicroelectronics. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Manufacturer:**  
STMicroelectronics  

### **Specifications:**  
- **Interface:** I²C  
- **Supply Voltage:** 1.8V to 5.5V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Timekeeping Current:** 400nA (typical)  
- **Clock Accuracy:** ±5ppm (±0.432 seconds/day) at 25°C  
- **Package:** SOIC-8  

### **Descriptions:**  
- The M41ST85WMX6 is a low-power serial real-time clock (RTC) with an integrated 32.768 kHz oscillator.  
- It provides timekeeping functions including seconds, minutes, hours, day, date, month, and year (with leap year compensation up to 2099).  
- Includes a built-in power-sense circuit for automatic switchover to backup supply when the main power fails.  

### **Features:**  
- **Battery Backup:** Operates from a backup supply when main power is lost.  
- **Alarm Function:** Programmable alarm with interrupt capability.  
- **Watchdog Timer:** Configurable watchdog timer for system monitoring.  
- **Tamper Detection:** Optional tamper detection feature for security applications.  
- **Low Power Consumption:** Ultra-low power consumption in battery backup mode.  
- **I²C Interface:** Supports standard (100 kHz) and fast (400 kHz) I²C modes.  

This information is strictly based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

512 Kbit (64 Bit x8) Serial Access RTC and NVRAM Supervisor

Alternative Part Number

  • DS1307Z+ --: I2C real-time clock with 56-byte NV SRAM and similar serial interface; widely available and functionally comparable for timekeeping and battery-backed storage.
  • PCF8563T --: Low-power I2C RTC with clock/calendar and alarm functions, suitable drop-in for many M41ST85 applications where supervisor features are not critical.
  • BQ32000DR --: I2C RTC with integrated trickle-charge and backup supply switching, offering comparable timekeeping and battery backup functionality.

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