Dallas Semiconductor introduces the DS1374 2-wire serial real-time clock (RTC). The DS1374 combines a 32-bit binary counter, watchdog, period alarm, programmable square-wave output, and power-on reset.
The elapsed time counter's 32-bit binary counter increments once per second, and can be used to derive time of day, week, month, and year by using a software algorithm. The DS1374 monitors VCC and when a power-fail occurs, it write-protects the internal registers, resets the processor, and switches to backup power to prevent data corruption. In low-power mode, the oscillator maintains timekeeping down to 1.3V, consuming less than 1µA of current. When VCC returns to nominal conditions, the DS1374 holds the processor in reset for 250ms while operating conditions stabilize. An optional trickle-charging circuit backs up the DS1374 with a super cap or rechargeable battery. Additionally, the reset pin is monitored as a pushbutton input for externally generating a reset. Address and data are transferred serially through a 2-wire serial bus.
The DS1374 operates over the extended-industrial temperature range (-40°C to +85°C) and is available in a 10-pin µSOP package. Prices start at $1.25 (1000-up, FOB USA).
Additional Information:
- Full Data Sheet (PDF)
