DS1286+

Overview

The DS1286+ is a Real-Time Clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides clock and calendar functions with a parallel interface, supporting both 12-hour and 24-hour time formats alongside YY-MM-DD-dd date formatting. The device includes 50 bytes of SRAM for data storage and features an alarm function, leap year compensation, square wave output, and a watchdog timer. It operates on a 4.5V to 5.5V supply voltage with a maximum current consumption of 7mA at 5V during timekeeping. The component is housed in a 28-EDIP package with 23 leads and is designed for through-hole mounting.

Feature Summary

• Integrated RTC with 50B SRAM and parallel bus interface
• Supports 12/24 hour time formats and YY-MM-DD-dd date format
• Includes alarm, leap year, square wave output, and watchdog timer features

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing calendar and timestamp capabilities
• Embedded systems utilizing parallel interfaces for real-time clock integration

Procurement Notes

Verify the specific package variant, as the DS1286+ is available in multiple form factors including DIP and PLCC. Confirm RoHS compliance status and lead times with authorized distributors, as availability may vary. Ensure the selected part number matches the required pinout and voltage specifications for the target application design.

Selection Notes

Select the DS1286+ when a parallel interface is preferred over serial alternatives like SPI or I2C. Consider the 50-byte SRAM capacity for sufficient non-volatile data storage needs. Verify that the 4.5V to 5.5V operating voltage range aligns with the system power supply. The watchdog timer feature is beneficial for applications requiring fault detection and recovery mechanisms.

Part Context

The DS1286+ belongs to the Maxim Integrated DS128x series of real-time clocks, which are designed for high-reliability timing applications. This series typically integrates battery backup switching to maintain timekeeping during main power loss. The parallel interface allows for direct connection to microprocessors with separate address and data buses, simplifying system architecture in legacy or specific industrial designs.

Replacement Considerations

Check for equivalent parts within the DS128x family, such as the DS12885 or DS12887, which offer similar functionality but may differ in package type or additional features like NVSRAM. Ensure compatibility with existing PCB footprints and software drivers when substituting.