Maxim Integrated DS1685E-3+ Real-Time Clock

The Maxim Integrated DS1685E-3+ is a full-featured, year-2000-compliant (Y2K), real-time clock/calendar (RTC) integrated circuit, designed to address the needs of complex embedded systems. This RTC provides a robust timekeeping solution that includes a built-in microprocessor-compatible 242-byte nonvolatile (NV) static RAM. Its versatility and reliability make it an excellent choice for applications in telecommunications, networking, data servers, and industrial equipment where accurate timekeeping is crucial.

The DS1685E-3+ operates at a voltage range of 2.97V to 5.5V and is characterized for operation over the full industrial temperature range (-40°C to +85°C). It comes in a 24-pin EDIP (Extended DIP) package, ensuring compatibility with a wide range of PCB layouts and easy integration into system designs.

Key features of the DS1685E-3+ include:

• Integrated NV SRAM: 242 bytes of user-accessible nonvolatile memory for data storage that is preserved even when the main power is lost.
• Century Byte: The RTC includes a century byte that automatically adjusts for leap years and changes in century, ensuring the system remains Y2K compliant.
• Programmable Alarm: The device features a programmable alarm function that can be set to trigger on a specific second, minute, hour, day, date, month, or year.
• Interrupt Functions: Multiple interrupt functions with a dedicated interrupt pin provide versatility in system design, allowing for power management and event-driven actions.
• Timekeeping Accuracy: Maintains accurate timekeeping with an onboard crystal oscillator and also supports external crystals for improved precision.
• Battery Backup Input: A dedicated VBAT input allows for a backup battery to maintain timekeeping and SRAM data during main power loss.

The DS1685E-3+ is an ideal RTC solution for designers looking to incorporate reliable timekeeping and data retention features into their systems without compromising on space or power consumption. Its combination of nonvolatile memory, extensive interrupt capabilities, and robust environmental tolerance ensures that it can meet the demands of a wide array of applications.

For more detailed specifications and application information, designers are encouraged to refer to the official Maxim Integrated DS1685E-3+ datasheet and application notes.