Part Number	Replacement	Explanation

Description

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The DS1347 SPI-compatible real-time clock (RTC) contains a real-time clock/calendar and 31 x 8 bits of static random-access memory (SRAM). The real-time clock/calendar provides seconds, minutes, hours, day, date, month, year, and century information. A time/date programmable polled ALARM is included in the device. The end-of-the-month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24hr or 12hr format with an active-low AM/PM indicator. The device operates with a supply voltage of +2V to +5.5V, are available in the ultra-small 8-pin TDFN package, and work over the -40°C to +85°C industrial temperature range.

DS1346, DS1347: Typical Operating Circuit Enlarge+

Key Features

• Completely Manages All Timekeeping Functions
  • RTC Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century
  • Leap-Year Compensation
  • 31 x 8-Bit SRAM for Scratchpad Data Storage
  • Programmable Time/Date Polled ALARM Function
  • Uses Standard 32.768kHz Watch Crystal
• Low-Power Operation Extends Battery Life
  • Low Timekeeping Current (400nA at 2V)
  • +2V to +5.5V Wide Operating Voltage Range
• Standard Serial Port Interfaces with Most Microcontrollers
  • SPI (Mode 1 or 3) Interface: 4MHz at 5V, 1MHz at 2V
  • Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or SRAM
• 3mm x 3mm x 0.8mm, 8-Pin TDFN Package Minimizes Required Space
  • No External Crystal Bias Resistors or Capacitors Required

Applications/Uses

• Battery-Powered Products
• Fax Machines
• Intelligent Instruments
• Point-of-Sale Equipment
• Portable Instruments