Click here for production status of specific part numbers. DS1390DS1394 Low-Voltage SPI/3-Wire RTCs with Trickle Charger General Description Features The low-voltage serial-peripheral interface (SPI) Real-Time Clock Counts Hundredths of Seconds, DS1390/DS1391/DS1394 and the low-voltage 3-wire Seconds, Minutes, Hours, Day, Date, Month, and DS1392/DS1393 real-time clocks (RTCs) are clocks/ Year with Leap-Year Compensation Valid Up to 2100 calendars that provide hundredths of a second, seconds, Output Pin Configurable as Interrupt or Square minutes, hours, day, date, month, and year information. Wave with Programmable Frequency of 32.768kHz, The date at the end of the month is automatically adjusted 8.192kHz, 4.096kHz, or 1Hz (DS1390/DS1393/ for months with fewer than 31 days, including corrections DS1394 Only) for leap year. The clock operates in either the 24-hour or One Time-of-Day Alarm 12-hour format with an AM/PM indicator. One program- Power-Fail Detect and Switch Circuitry mable time-of-day alarm is provided. A temperature-com- pensated voltage reference monitors the status of V CC Reset Output/Debounced Input (DS1391/DS1393) and automatically disables the bus interface and switches Separate SQW and INT Output (DS1392) to the backup supply if a power failure is detected. On the Trickle-Charge Capability DS1390, a single open-drain output provides a CPU inter- rupt or a square wave at one of four selectable frequen- SPI Supports Modes 0 and 2 (DS1394) cies. The DS1391 replaces the SQW/INT pin with a RST SPI Supports Modes 1 and 3 (DS1390/DS1391) output/debounced input. 3-Wire Interface (DS1392/DS1393) The DS1390, DS1391, and DS1394 are programmed 4MHz at 3.0V and 3.3V serially through an SPI-compatible, bidirectional bus. The DS1392 and DS1393 communicate over a 3-wire serial 1MHz at 1.8V bus, and the extra pin is used for either a separate inter- Three Operating Voltages: 1.8V 5%, 3.0V 10%, rupt pin or a RST output/debounced input. and 2.97 to 5.5V (DS1394: 3.3V 10%) All five devices are available in a 10-pin SOP package, Industrial Temperature Range: -40C to +85C and are rated over the industrial temperature range. Underwriters Laboratories (UL) Recognized Applications Ordering Information appears at end of the data sheet. Hand-Held Devices GPS/Telematics Devices Typical Operating Circuits appear at end of the data sheet. Embedded Time Stamping Medical Devices SPI is a trademark of Motorola, Inc. 19-4898 Rev 5 7/19DS1390DS1394 Low-Voltage SPI/3-Wire RTCs with Trickle Charger Absolute Maximum Ratings Voltage Range on V Pin Relative to Ground ...-0.3V to +6.0V Storage Temperature Range ............................ -55C to +125C CC Voltage Range on Inputs Relative Soldering Temperature ..........................Refer to the IPC/JEDEC to Ground .............................................. -0.3V to (V + 0.3V) J-STD-020 Specification. CC Operating Temperature Range ........................... -40C to +85C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended DC Operating Conditions (V = V to V , T = -40C to +85C, unless otherwise noted. Typical values are at nominal supply voltage and T = +25C, CC CC(MIN) CC(MAX) A A unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DS139x-33 2.97 3.3 5.50 Supply Voltage (Note 2) V DS139x-3 2.7 3.0 3.3 V CC DS139x-18 1.71 1.8 1.89 0.7 x V + CC Logic 1 V (Note 2) V IH V 0.5 CC +0.3 x Logic 0 V (Note 2) -0.3 V IL V CC Supply Voltage, Pullup V (Note 2) 5.5 V PU SQW/INT, SQW, INT, V = 0V CC -33 1.3 3.0 V CC(MAX) V Voltage (Note 2) V -3 1.3 3.0 3.7 V BACKUP BACKUP -18 1.3 3.0 3.7 -33 2.70 2.88 2.97 Power-Fail Voltage (Note 2) V -3 2.45 2.6 2.70 V PF -18 1.51 1.6 1.71 R1 (Notes 3, 4) 250 Trickle-Charge Current-Limiting R2 (Notes 3, 5) 2000 Resistors R3 (Notes 3, 6) 4000 Input Leakage I (Note 7) -1 +1 A LI I/O Leakage I (Note 8) -1 +1 A LO RST Pin I/O Leakage I (Note 9) -200 +10 A LORST -33, -3 (V = 0.85 x V ) -1 OH CC DOUT Logic 1 Output I mA OHDOUT -18 (V = 0.80 x V ) 0.750 OH CC -33, -3 (V = 0.15 x V ) 3 OL CC DOUT Logic 0 Output I mA OHDOUT -18 (V = 0.20 x V ) 2 OL CC Logic 0 Output V > 1.71V V = 0.4V 3.0 mA CC OL (DS1390/DS1393/DS1394 I OLSIR SQW/INT DS1392 SQW, INT 1.3V < V < 1.71V V = 0.4V 250 A CC OL DS1391/DS1393 RST) -33 2 mA V Active Supply Current CC I -3 2 CCA (Note 10) -18 500 A Maxim Integrated 2 www.maximintegrated.com