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DALLAS Semiconductor, represented by Arrow Electronics , has released the DS1318, a 44-bit, binary, elapsed time counter with 244 microseconds resolution.
The DS1318 combines a 32-bit seconds counter, a 12-bit subseconds counter, periodic interrupt/alarm, and programmable square-wave output in a 24-pin TSSOP package.
The elapsed time counter's 44-bit binary counter increments once every 244μs. By using a software algorithm, the DS1318 can derive time of day, week, month and year, serving as a real-time clock. The square-wave output can be selected from 32.768kHz, 8.192kHz, 4.096kHz, or 1Hz. The interrupt output can be generated periodically or when the upper 32 bits of the counter match an alarm register.
The DS1318 monitors Vcc and when a power-fail occurs it write-protects the internal registers and switches to backup power to prevent data corruption. In low-power mode, the oscillator maintains timekeeping down to 1.3V, consuming less than 1 μA of current.
Address and data are transferred using a standard parallel-address bus. The DS1318 is rated for operation over the industrial temperature range -40°C to +85°C.
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