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Home » NEWEST Products » New by Manufacturer » Maxim Integrated » Maxim Integrated DS134x SPI / 3-Wire RTCs
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Maxim IC DS1343 Low-Current SPI / 3-Wire RTCs

Maxim Integrated IC DS134x Low-Current SPI / 3-Wire RTCs

Maxim Integrated IC DS134x low-current SPI / 3-wire real-time clocks (RTCs) are time-keeping devices compatible with any 32.768 kHz crystal. The ability of the DS134x to drive high ESR allows use of the smallest available surface mount crystals, saving board space. Maxim Integrated IC DS134x RTCs also provide extremely low standby current, permitting longer life from a backup supply source. 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. Maxim Integrated IC DS134x RTCs are designed for use in embedded timestamping, handheld devices, medical equipment, and telematics applications.

  • 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 Packageor 14-Pin TDFN Package
  • Embedded Timestamping
  • Handheld Devices
  • Medical
  • Telematics

Typical Operating Circuit

Typical Operating Circuit
  • Maxim Integrated
  • Semiconductors|Integrated Circuits|IC-Clock & Timer