Dallas Semiconductor's DS139x (DS1390, DS1391, DS1392, and DS1393) family of 3-/4-wire or SPI-bus realtime clocks feature automatic power switching, trickle-charge output, alarm, microprocessor reset, square-wave output or periodic interrupt. The DS139x ICs are available in a small 10-pin SOP package, which according to the company is the smallest footprint in the industry when compared to other realtime clocks with a SPI or 3-wire interface. The DS1390 and DS1391 use the 4-wire or SPI bus interface, while the DS1392 and DS1393 use the 3-wire interface. All four parts monitor Vcc and, when a power-fail occurs, they write-protect the internal registers and switch to backup power to prevent data corruption. A built-in trickle-charging circuit backs up the DS139x with a supercap or rechargeable battery.
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