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DS1347：Low-Current, SPI-Compatible Real-Time Clock

Save Board Space with TDFN Package and Ability to Drive Surface-Mount Crystals

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.

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

DS1346, DS1347: Typical Operating Circuit Applications/Uses Battery-Powered Products Fax Machines Intelligent Instruments Point-of-Sale Equipment Portable Instruments

DataSheet

Parametrics

Quality and Environmental Data

• DS1347.pdf

Related Products

• DS1343：Low-Current SPI/3-Wire RTCs
• DS1344：Low-Current SPI/3-Wire RTCs
• DS1305：Serial Alarm Real-Time Clock
• DS1306：Serial Alarm Real-Time Clock

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