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