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STMicro expands serial RTC IC family

Posted: 10 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? m41t0? m41t8? serial rtc ic? real time clock?

STMicroelectronics has expanded its family of serial real-time-clock (RTC) ICs with the addition of two new devices that are designed for use in white goods, handheld equipment, POS terminals, A/V equipment, and other consumer items.

The M41T0 and M41T8 contain counters for tracking time in seconds, minutes, hours, day, date, month, years, and century. Both also include automatic leap-year compensation. In addition to its timekeeping function, the M41T0 features an oscillator-stop bit that detects when the oscillator begins to drop out indicating power is failing.

The M41T80 has a programmable alarm with an interrupt function, as well as a programmable square-wave output from 1Hz to 32kHz and a fixed 32kHz output. The fixed 32kHz output can be used to drive microprocessors and microcontrollers that employ PLL clock synthesis requiring 32kHz as a reference. Furthermore, it is also well suited for clocking micros during low-power modes. Designed for "always on" operation, the 32kHz output can nevertheless be disabled by user software.

Both RTCs include an industry standard 400kHz I2C serial interface and operate from a supply of 2V to 5.5V over the industrial temperature range of -400C to 850C. The M41T0 draws 900nA in standby and 355A during active, while the M41T80 draws 1.55A in standby and 305A active current.

The M41T0 is sampling in both SO8 and TSSOPs, while the M41T80 is available in SO8 packages.

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