DS1302-TD

The DS1302Z trickle-charge timekeeping circuit 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 31 bytes of scratchpad RAM. Widely used in telephones, fax machines, portable instruments, and battery-powered instrumentation products. The DS1302Z is available in an SOP8 package.

Applications

• Telephone
• Fax
• Portable instruments
• Instrumentation

Key features

• Real-time clock computes year, month, day, hour, minute, second, and day-of-week through year 2100, with leap year compensation.
• 31 x 8-bit general-purpose scratchpad RAM.
• Serial I/O minimizes pin count.
• Wide operating voltage range: 2.0V to 5.5V.
• Operating current less than 300nA at 2.0V.
• Single-byte or multi-byte (burst mode) data transfer for clock or RAM read/write.
• 8-pin DIP or optional 8-pin surface-mount SOP package.
• Simple 3-wire interface.
• TTL-compatible (VCC = 5V).
• Industrial temperature range: -40℃ to +85℃.