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STMicroelectronics | M41ST85WMH6F

Manufacturer Part #

M41ST85WMH6F

M41ST Series 3.3 V I2C Serial RTC NVRAM / Microprocessor Superviser - SOH-28

ECAD Model:
Mfr. Name: STMicroelectronics
Standard Pkg:
Product Variant Information section
Date Code: 2443
Product Specification Section
STMicroelectronics M41ST85WMH6F - Technical Attributes
Attributes Table
Date Format: DW:DM:M:Y/Binary
Time Format: HH:MM:SS:hh/Binary
Interface: I2C
Non-Volatile Memory Size: 44B
SRAM Size: 512b
Supply Voltage-Nom: 2.7V to 3.6V
Temperature Grade: Industrial
Operating Temp Range: -40°C to +85°C
Storage Temperature Range: -40°C to +85°C
Package Style:  SOH-28
Mounting Method: Surface Mount
Features & Applications
The M41ST85WMH6F is a combination serial real-time clock, microprocessor supervisor, and NVRAM supervisor.

It is built in a low-power CMOS SRAM process and has a 64-byte memory space with 44 bytes of NVRAM and 20 memory-mapped RTC registers. The RTC registers are configured in binary coded decimal (BCD) format.

Features:

  • Automatic battery switchover and WRITE
  • protect for:
    • Internal serial RTC and
    • External low power SRAM (LPSRAM)
  • 400 kHz I2C serial interface
  • 3.0/3.3 V operating voltage
    • VCC = 2.7 to 3.6 V
  • Ultralow battery supply current of 500 nA (max)
  • –40°C to +85°C operation
  • RoHS compliant
    • Lead-free second level interconnecte

Serial RTC features:

  • 400 kHz I2C
  • 44 bytes of general purpose NVRAM
  • Counters for:
    • Seconds, minutes, hours, day, date, month, and year
    • Century
    • Tenths/hundredths of seconds
    • Clock calibration register allows compensation for crystal variations over temperature
  • 2.5 to 5.5 V oscillator operating voltage

Microprocessor supervisor features:

  • Programmable watchdog
    • 62.5 ms to 128 s time-out period
  • Early power-fail warning circuit (PFI/PFO) with 1.25 V precision reference

NVRAM supervisor features:

  • Non-volatizes external LPSRAM
    • Automatically switches to back-up battery and deselects (write-protects) externa LPSRAM via chip-enable gate
    • Power-fail deselect (write protect) voltage, VPFD = 2.60 V (nom)
    • Switchover, VSO = 2.50 V (nom)
  • Battery monitor (battery low flag)
Pricing Section
Global Stock:
569
USA:
569
Cost Per Unit
$12.80
Unit Price:
$9.30 USD Each
Total
$25.60
USD

$7.00 reeling fee is amortized over the number of components for each reel.
Mini-Reels are a custom product and are non-cancelable and non-returnable.

Product Variant Information section