STMicroelectronics Manuals

The M41T00S is a serial real-time clock with 2.0 to 5.5 V clock operating voltage, counters for seconds, minutes, hours, day, date, month, year, and century, software clock calibration, automatic switchover and deselect circuitry, low operating current of 300 µA, oscillator stop detection, battery or SuperCap™ backup, -40 to 85 °C operating temperature and ultra-low battery supply current of 0.6 µA.

This document describes the features and functions of M41T62, M41T63, M41T64, and M41T65 serial real-time clock (RTC) products, including 400 kHz I2C serial interface, memory mapped registers, timekeeping current, operating voltage range, low-power mode, programmable square wave output, and programmable alarm.

This document describes the features and characteristics of the M41T60 serial access real-time clock, including counters, crystal oscillator, serial interface, low power consumption, etc.

M41ST87Y and M41ST87W are 5.0V and 3.3/3.0V secure serial RTC and NVRAM supervisors with tamper detection and 128 bytes of clearable NVRAM. They support various operating voltages, have a 400kHz I2C bus, and feature automatic switchover and deselect circuitry. The products have multiple features, including NVRAM supervisor, counters, programmable alarm and interrupt function, programmable watchdog timer, unique electronic serial number, and low battery supply current.

M41T0 is a serial real-time clock produced by ST company, which has counters for seconds, minutes, hours, day, date, month, years, and century, 32KHz crystal oscillator, I2C bus interface, low standby current, 2.0-5.5V clock operating voltage, special software programmable output and other features.

M41T94 is a low-power clock chip produced by ST company. Its main features are 44 bytes of NVRAM and reset function, as well as 32KHz crystal oscillator, ultra-low battery supply current, automatic switching and deselection circuit, programmable alarm and interrupt function, accurate programmable watchdog timer, microprocessor power-on reset, choice of power-fail deselect voltage, etc.

M41ST85W is a 3.0/3.3 V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor. It features automatic battery switchover and WRITE protection for internal serial RTC and external low power SRAM (LPSRAM). It also features 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), RoHS compliant, lead-free second level interconnect and so on.

M48T37Y, M48T37V is an integrated ultra low power SRAM, real-time clock, power-fail control circuit, and battery product produced by ST company. It has frequency test output, automatic power-fail chip deselect and WRITE protection, watchdog timer and other functions.

M48T35AV 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM is an integrated, ultra low power SRAM, real-time clock, power-fail control circuit and battery.

The M41T56 is a 32 KHz serial real-time clock (RTC) with 56 bytes NVRAM

This document describes the features and characteristics of a serial real-time clock (RTC) product called M41T11. The product includes counters for seconds, minutes, hours, day, date, month, years, and century, a 32KHz crystal oscillator, support for I2C bus, and ultra-low battery supply current.

M41T00 is a low power serial real-time clock with a built-in 32.768 kHz oscillator. It features counters for seconds, minutes, hours, day, month, years, and century, supports I2C bus (100 kHz protocol), operates at a clock voltage of 2.0 to 5.5 V, has an ultra low battery supply current of 0.8 µA, and includes automatic switchover and deselect circuitry, software clock calibration, and automatic leap year compensation.

This document introduces the features and characteristics of M48T201Y M48T201V 5.0 or 3.3 V TIMEKEEPER® supervisor, including integrated real time clock, power-fail control circuit, battery and crystal, watchdog timer, choice of write protect voltages etc.