General Description The low-voltage serial-peripheral interface (SPI™) DS1390/DS1391/DS1394 and the low-voltage 3-wire DS1392/DS1393 real-time clocks (RTCs) are clocks/ calendars that provide hundredths of a second, seconds, minutes, hours, day, date, month, and year information. Features ● Real-Time Clock Counts Hundredths of Seconds, Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100 ● Output Pin Configurable as Interrupt or Square Wave with Programmable Frequency of 32.768kHz, 8.192kHz, 4.096kHz, or 1Hz (DS1390/DS1393/ DS1394 Only) ● One Time-of-Day Alarm ● Power-Fail Detect and Switch Circuitry ● Reset Output/Debounced Input (DS1391/DS1393) ● Separate SQW and INT Output (DS1392) ● Trickle-Charge Capability ● SPI Supports Modes 0 and 2 (DS1394) ● SPI Supports Modes 1 and 3 (DS1390/DS1391) ● 3-Wire Interface (DS1392/DS1393) ● 4MHz at 3.0V and 3.3V ● 1MHz at 1.8V ● Three Operating Voltages: 1.8V ±5%, 3.0V ±10%, and 2.97 to 5.5V (DS1394: 3.3V ±10%) ● Industrial Temperature Range: -40°C to +85°C ● Underwriters Laboratories (UL) Recognized Applications ● Hand-Held Devices ● GPS/Telematics Devices ● Embedded Time Stamping ● Medical Devices
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