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DS1343 - (DS1343 / DS1344) Low-Current SPI/3-Wire RTCs

Description

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.

Features

  • S Low Timekeeping Current of 250nA (typ) S Compatible with Crystal ESR Up to 100kI S Versions Available to Support Either 6pF or 12.5pF Crystals S RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Through 2099 S Power-Fail and Switch Circuitry S Three Operating Voltages 1.8V ±5% 3.0V±10% 3.3V ±10% S Trickle-Charge Capability S Maintain Time Down to 1.15V (typ) S Support Motorola SPI Modes 1 and 3, or Standard 3-Wire Interface S Burst.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-5801; Rev 0; 3/11 Low-Current SPI/3-Wire RTCs General Description 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 AM/PM indicator. Address and data are transferred serially through an SPI™ or 3-wire interface. Two programmable time-of-day alarms are provided.
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