OUTLINE

The RP/RF/RS5C62 are CMOS LSIs which serve microcomputers as real-time clocks providing time, calendar, and alarm functions in direct coupling with the data buses of CPUs such as 8086 and 68000. A built-in timer counter acts as a watchdog timer or interrupt timer. They are available in three different types of packages: the DIP type, the SOP type, and the SSOP type.

FEATURES

• Directly connected to CPU, enabling fast access.

• 4bit bidirectional data bus, and 4bit address bus.

• The oscillator is driven by a constant voltage, so the oscillation frequency is stable even when the power supply

voltage fluctuates.

• Built-in timer counter using internal clock.

• Generates cyclic CPU interrupts, and generates alarm-match interrupts.

• Interrupt flag and interrupt inhibit.

• Clock (hour, minute, second), calendar (leap year, year, month, day, day-of-the-week), alarm (hour, minute).

• 12-or 24-hour mode is selectable.

• Recognizes leap years automatically.

• All clock and alarm data expressed in BCD codes.

• ±30 seconds adjustment function.

• Determines whether clock data is valid or invalid.

• Consumes very low power due to CMOS technology, so it can be backed up by batteries.

• Power supply voltage between 3.0 to 5.0V.

• Time keeping supply voltage between 2.0 to 6.0V.

• Package : 18pin DIP for RP5C62, 18pin SOP for RF5C62, 20pin SSOP for RS5C62.