DS1344
PRODUCTIONLow-Current SPI/3-Wire RTCs
Compatible with Any 32.768kHz Crystal
- Part Models
- 10
- 1ku List Price
- Starting From $2.95
Part Details
- Low Timekeeping Current of 250nA (typ)
- Compatible with Crystal ESR Up to 100kΩ
- Versions Available to Support Either 6pF or 12.5pF Crystals
- RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Through 2099
- Power-Fail and Switch Circuitry
- Three Operating Voltages
- 1.8V ±5%
- 3.0V ±10%
- 3.3V ±10%
- Trickle-Charge Capability
- Maintain Time Down to 1.15V (typ)
- Support Motorola SPI Modes 1 and 3, or Standard 3-Wire Interface
- Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
- 96-Byte Battery-Backed NV RAM for Data Storage
- Two Time-of-Day Alarms with Two Interrupt Outputs
- Industrial Temperature Range
- 20-Pin TSSOP or 14-Pin TDFN Package
The DS1343/DS1344 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, permitting longer life from a backup supply source. The devices also support high-ESR crystals, broadening the pool of usable crystals for the devices. 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 24-hour or 12-hour format with an active-low AM/PM indicator.
Address and data are transferred serially through an SPI™ or 3-wire interface. Two programmable time-of-day alarms are provided. Each alarm can generate an interrupt on a combination of seconds, minutes, hours, and day. Don't-care states can be inserted into one or more fields if it is desired for them to be ignored for the alarm condition. The time-of-day alarms can be programmed to assert two different interrupt outputs, or they can be combined to assert one common interrupt output. Both interrupt outputs operate when the device is powered by either VCC or VBAT.
The devices are available in a lead-free/RoHS-compliant, 20-pin TSSOP or 14-pin TDFN package, and support a -40°C to +85°C extended industrial temperature range.
Applications
- Embedded Timestamping
- Handheld Devices
- Medical
- Telematics
Documentation
Data Sheet 1
Design Note 7
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 |
|---|---|---|---|
| DS1344D-18+ | Thin Dual Flatpack No Leads | ||
| DS1344D-18+T&R | Thin Dual Flatpack No Leads | ||
| DS1344D-3+ | Thin Dual Flatpack No Leads | ||
| DS1344D-3+T&R | Thin Dual Flatpack No Leads | ||
| DS1344D-33+ | Thin Dual Flatpack No Leads | ||
| DS1344D-33+T&R | Thin Dual Flatpack No Leads | ||
| DS1344E-3+ | Thin Shrink Small-Outline Package | ||
| DS1344E-3+T&R | Thin Shrink Small-Outline Package | ||
| DS1344E-33+ | Thin Shrink Small-Outline Package | ||
| DS1344E-33+T&R | Thin Shrink Small-Outline Package |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
| No Match Found | ||
|
Jun 20, 2016 - 1612 ASSEMBLY |
||
| DS1344D-18+ | PRODUCTION | |
| DS1344D-18+T&R | LAST TIME BUY | |
| DS1344D-3+ | PRODUCTION | |
| DS1344D-33+ | PRODUCTION | |
| DS1344D-33+T&R | PRODUCTION | |
|
Dec 11, 2018 - 1754N ASSEMBLY |
||
| DS1344E-3+ | PRODUCTION | |
| DS1344E-3+T&R | PRODUCTION | |
| DS1344E-33+ | PRODUCTION | |
| DS1344E-33+T&R | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
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