Maxim Integrated DS1743W-150: Nonvolatile Timekeeping RAM

The DS1743W-150 is a full-function, year-2000-compliant (Y2K-compliant), real-time clock/calendar (RTC) and 64K x 8 nonvolatile static RAM designed by Maxim Integrated to provide a reliable and durable timekeeping solution for applications requiring data and time storage across power cycles. Encapsulated in a 34-pin PowerCap Module (PCM), this device ensures data and clock/time integrity by automatically switching to its integrated lithium battery when the primary power supply is compromised.

One of the key features of the DS1743W-150 is its ability to maintain seconds, minutes, hours, day, date, month, and year information, with the added convenience of automatic leap year compensation valid up to the year 2100. The clock operates in either 24-hour or 12-hour format with an AM/PM indicator, providing flexibility to suit various application requirements.

The RTC functionality is complemented by a robust nonvolatile static RAM section, offering 64Kbytes of storage space. This nonvolatile memory ensures that data is preserved when the device is powered down, making it an ideal choice for critical data retention scenarios such as in embedded systems, utility meters, and other industrial applications where data integrity is paramount.

Operating at 5V, the DS1743W-150 boasts a precision temperature-compensated voltage reference and comparator circuit which monitors the status of VCC to detect power failures. Upon detection, it automatically switches to the backup battery and writes-protects the memory, thereby preventing data corruption during volatile power conditions. The DS1743W-150 also features a programmable interrupt function, which can be used for various purposes such as alarm triggers or system wake-up signals.

With its integrated power-fail write protection, long battery life, and robust static RAM, the DS1743W-150 from Maxim Integrated is a reliable and essential component for systems that cannot afford to lose time or data. Its compact PowerCap Module design makes it easy to integrate into a variety of system architectures, offering a secure way to maintain critical data and accurate timekeeping, even in the face of power interruptions.