DS1302NA/HG

The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM, communicating with a microprocessor via a simple serial interface. The real-time clock/calendar provides year, month, day, hour, minute, and second information, with automatic end-of-month adjustment for months with fewer than 31 days, as well as leap year correction. With an AM/PM indicator, the clock can operate in either 12-hour or 24-hour mode. In addition to timekeeping functions, the device offers the following features: dual-pin primary and backup power supply, programmable trickle charger VCC1, and an additional 7-byte scratchpad register. The DS1302 is available in DIP-8, SOP-8, DFN-8 3×3, and MSOP-8 packages.

Applications

• Telephone
• Fax
• Portable instruments
• Instrumentation

Key features

• Real-time clock computes year, month, date, hour, minute, second, and day-of-week through year 2100 with leap-year compensation.
• 31 × 8-bit general-purpose scratchpad RAM.
• Serial I/O minimizes pin count.
• Wide operating voltage range: 2.0V ~ 5.5V.
• Operating current less than 300nA at 2.0V.
• Single-byte or multi-byte (burst mode) data transfer for clock/RAM read/write.
• Simple 3-wire interface.
• TTL-compatible (VCC = 5V).
• Operating temperature range: -40°C ~ +85°C.
• Enhanced successor to DS1302 series, featuring advanced process node, fully compatible with the popular 12.5pF crystal for cost savings.
• Package options: DIP-8, SOP-8, DFN-8 3×3, and MSOP-8