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DS1302 Trickle-Charge Timekeeping Chip

The DS1302 from Maxim uses less than 300 nA at 2.0 V and retains data and clock information on less than 1 µW of power

Image of Maxim's DS1302 Trickle-Charge Timekeeping ChipThe DS1302 trickle-charge timekeeping chip from Maxim contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. 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 24-hour or 12-hour format with an AM/PM indicator.

Interfacing the DS1302 with a microprocessor is simplified by using synchronous serial communication. Only three wires are required to communicate with the clock/RAM: CE, I/O (data line), and SCLK (serial clock). Data can be transferred to and from the clock/RAM 1 byte at a time or in a burst of up to 31 bytes. The DS1302 is designed to operate on very-low power and retain data and clock information on less than 1 µW.

The DS1302 is the successor to the DS1202. In addition to the basic timekeeping functions of the DS1202, the DS1302 has dual-power pins for primary and backup power supplies, programmable trickle charger for VCC1, and seven additional bytes of scratchpad memory.

Key Features
  • Real-time clock counts seconds, minutes, hours, day, date, month, and year with leap year compensation valid up to 2100
  • 31 x 8 battery-backed general-purpose RAM
  • Serial I/O for minimum pin-count
  • 2.0 V to 5.5 V full operation
  • Uses less than 300 nA at 2.0 V
  • DS1202 compatible
  • Single-byte or multiple-byte (burst mode) data transfer for read or write of clock or RAM data
  • 8-pin DIP or optional 8-pin SO for surface-mount
  • Simple three-wire interface
  • TTL-compatible (VCC = 5 V)
  • Optional industrial temperature range: -40°C to +85°C

DS1302

ImageManufacturer Part NumberDescriptionAvailable Quantity
IC RTC CLK/CALENDAR SER 8-SOICDS1302Z+T&RIC RTC CLK/CALENDAR SER 8-SOIC25454 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-SOICDS1302S+T&RIC RTC CLK/CALENDAR SER 8-SOIC1771 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-SOICDS1302ZN+T&RIC RTC CLK/CALENDAR SER 8-SOIC9507 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-SOICDS1302Z+IC RTC CLK/CALENDAR SER 8-SOIC1763 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-SOICDS1302S+IC RTC CLK/CALENDAR SER 8-SOIC2579 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-DIPDS1302+IC RTC CLK/CALENDAR SER 8-DIP1253 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-SOICDS1302ZN+IC RTC CLK/CALENDAR SER 8-SOIC1317 - ImmediateView Details
IC RTC CLK/CALENDAR SER 8-SOICDS1302SN+IC RTC CLK/CALENDAR SER 8-SOIC925 - Immediate
17864 - Factory Stock
View Details
IC RTC CLK/CALENDAR SER 8-DIPDS1302N+IC RTC CLK/CALENDAR SER 8-DIP495 - Immediate
3400 - Factory Stock
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Published: 2015-01-20