DS1342
PRODUCTIONLow-Current I²C RTCs for High-ESR Crystals
Compatible with High-ESR Crystals While Offering the Lowest Possible Current
- Part Models
- 4
- 1ku List Price
- Starting From $1.79
Part Details
- Low Timekeeping Current of 250nA (typ)
- Compatible with Crystal ESR Up to 100kΩ
- Use Crystals with CL = 6pF (DS1341) or CL= 12.5pF (DS1342)
- +1.8V to +5.5V Operating Voltage Range
- Maintain Time Down to +1.15V (typ)
- Fast (400kHz) I²C Interface
- Bus Timeout for Lockup-Free Operation
- RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Through 2099
- External Clock Source for Synchronization Clock Reference (e.g., 32kHz, 50Hz/60Hz Power Line, GPS 1PPS)
- Two Time-of-Day Alarm with Two Interrupt Outputs
- Programmable Square-Wave Output
- Industrial Temperature Range (-40°C to +85°C)
- Small, 8-Pin µSOP or TDFN Packages
The DS1341/DS1342 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, which permits longer life from a power supply. The DS1341/DS1342 support high-ESR crystals, which broaden the pool of usable crystals for the devices. The DS1341 uses a 6pF crystal, while the DS1342 uses a 12.5pF crystal. These devices are accessed through an I²C serial interface. Other features include two time-of-day alarms, two interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism.
The clock/calendar provides 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 24hr or 12hr format with an AM/PM indicator.
The DS1341/DS1342 also include an input for synchronization. When a reference clock (e.g., 60Hz power line or GPS 1PPS) is present at the CLKIN pin and the enable external clock input bit (ECLK) is set to 1, the DS1341/DS1342 RTCs are frequency-locked to the external clock and the clock accuracy is determined by the external source. In case of external clock failure, the clock is switched to the crystal oscillator.
The devices are available in lead(Pb)-free/RoHS-compliant, 8-pin µSOP or TDFN packages. The devices support a -40°C to +85°C extended temperature range.
Applications
- Medical
- Point of Sale (POS)
- Portable Audio
- Portable Instruments
- Telematics
Documentation
Data Sheet 1
Reliability Data 1
Design Note 4
Technical Articles 3
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 |
|---|---|---|---|
| DS1342T+ | Thin Dual Flatpack No Leads, Exposed Pad | ||
| DS1342T+T&R | Thin Dual Flatpack No Leads, Exposed Pad | ||
| DS1342U+ | Micro-MAX, Thin Shrink Small-Outline | ||
| DS1342U+T&R | Micro-MAX, Thin Shrink Small-Outline |
This is the most up-to-date revision of the Data Sheet.
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