The DS1643P-120 is a state-of-the-art Nonvolatile Timekeeping RAM module developed by Maxim Integrated, a company renowned for its innovative and reliable integrated circuits. This product is a full-function, year 2000-compliant (Y2K) real-time clock/calendar (RTC) and 64K x 8 nonvolatile static RAM. It has been designed to maintain precise timekeeping, data integrity, and data retention in the absence of an external power supply, making it an ideal solution for a wide range of applications.

With a voltage range of 4.5V to 5.5V, the DS1643P-120 operates at a nominal 5V supply voltage, and its access time is as fast as 120ns, ensuring rapid data retrieval. The integrated lithium energy source and control circuitry constantly monitor VCC for an out-of-tolerance condition. When such a condition occurs, the device automatically switches to its internal lithium battery, thus preserving the integrity of the data and maintaining the RTC operation.

The clock/calendar functionality of the DS1643P-120 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 24-hour or 12-hour format with an AM/PM indicator. A precision crystal oscillator serves as the timekeeping element, ensuring high accuracy.

One of the key features of the DS1643P-120 is its nonvolatile nature. The module ensures that data is not lost when the power is removed. The integration of the RAM and real-time clock components makes this module particularly useful for applications that require reliable and continuous timekeeping and data storage, such as embedded systems, utility meters, industrial controllers, and point-of-sale equipment.

The package for the DS1643P-120 is a 34-pin PowerCap Module (PCM), which is designed to be surface-mounted on a motherboard. This compact packaging allows for efficient use of board space, which is critical in space-constrained applications.

Maxim Integrated's commitment to quality ensures that the DS1643P-120 provides a reliable and durable nonvolatile memory solution, with the added benefit of an integrated real-time clock, for sophisticated electronic systems.