DS1391
PRODUCTIONLow-Voltage SPI/3-Wire RTCs with Trickle Charger
Low-Voltage SPI/3-Wire RTCs with Trickle Charger have the Broadest Feature Set and the Smallest Footprint in Their Class
- Part Models
- 5
- 1ku List Price
- Starting From $2.50
Part Details
- 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
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. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. One programmable time-of-day alarm is provided. A temperature-compensated voltage reference monitors the status of VCC and automatically disables the bus interface and switches to the backup supply if a power failure is detected. On the DS1390, a single open drain output provides a CPU interrupt or a square wave at one of four selectable frequencies. The DS1391 replaces the SQW/active-low INT pin with an active-low RST output/debounced input.
The DS1390, DS1391, and DS1394 are programmed serially through an SPI-compatible, bidirectional bus. The DS1392 and DS1393 communicate over a 3-wire serial bus, and the extra pin is used for either a separate interrupt pin or an active-low RST output/debounced input.
All five devices are available in a 10-pin µSOP package, and are rated over the industrial temperature range.
Applications
- Embedded Time Stamping
- GPS/Telematics Devices
- Handheld Devices
- Medical Devices
Documentation
Data Sheet 1
Reliability Data 1
Design Note 9
Technical Articles 5
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS1391U-18+ | 10-MINI_SO-N/A | ||
| DS1391U-3+ | 10-MINI_SO-N/A | ||
| DS1391U-3+T&R | 10-MINI_SO-N/A | ||
| DS1391U-33+ | 10-MINI_SO-N/A | ||
| DS1391U-33+T&R | 10-MINI_SO-N/A |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Sep 19, 2018 - 1753N ASSEMBLY |
||
| DS1391U-18+ | PRODUCTION | |
| DS1391U-3+ | PRODUCTION | |
| DS1391U-3+T&R | PRODUCTION | |
| DS1391U-33+ | PRODUCTION | |
| DS1391U-33+T&R | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Product 2 | ||
| MAX6901 | 3-Wire Serial RTC in a TDFN | |
| MAX6902 | SPI-Compatible RTC in a TDFN | |
| Serial Address RTCs 3 | ||
| DS1302 | Trickle-Charge Timekeeping Chip | |
| DS1305 | Serial Alarm Real-Time Clock | |
| DS1306 | Serial Alarm Real-Time Clock |
Tools & Simulations
IBIS Model 1
Latest Discussions
No discussions on ds1391 yet. Have something to say?
Start a Discussion on EngineerZone®