DS1286I

Overview

The DS1286I is a parallel interface Real-Time Clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated. It provides clock and calendar functions with a 50-byte SRAM storage capacity. The device supports HH:MM:SS:hh time format and YY-MM-DD-dd date format. It operates on a 4.5V to 5.5V supply voltage, drawing a maximum of 7mA during timekeeping at 5V. Battery backup ranges from 2.4V to 3.5V. Housed in a 28-EDIP package with 23 leads, it features an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrated 50-byte SRAM for data storage
• Hardware alarm, leap year compensation, and watchdog timer
• Square wave output capability
• Parallel bus interface for direct microprocessor connection

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment with extended temperature requirements
• Embedded systems needing non-volatile memory and RTC integration

Procurement Notes

Verify the specific suffix 'I' indicates the industrial temperature grade (-40°C to +85°C) against the official datasheet. Confirm the 28-EDIP package dimensions match the design footprint. Check current availability status as this component may be subject to limited distribution or end-of-life notices.

Selection Notes

Select the DS1286I when a parallel interface is required over serial alternatives. Ensure the host system can support the multiplexed address/data bus timing. Verify that the 50-byte SRAM meets the application's data retention needs. Compare power consumption specifications if battery life is a critical constraint.

Part Context

This part belongs to the DS1286/DS1287 family of real-time clocks. It shares functional similarities with the DS12887 but differs in package type and specific feature sets like the watchdog timer. It is distinct from the DS1306 series which uses a serial interface.

Replacement Considerations

Direct pin-compatible replacements within the same family include the DS1286Y or DS1286N depending on package preference. Cross-family substitutes like the DS12887+ require interface adaptation due to different bus architectures.