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