DS1284QN+T&R

Overview

The DS1284QN+T&R is a real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides clock/calendar functionality with 50 bytes of static RAM and operates via a parallel interface. The device supports 12/24-hour time formats and YY-MM-DD-dd date formats. It functions within a supply voltage range of 4.5V to 5.5V, drawing a maximum current of 7mA at 5V during timekeeping. The component is housed in a 28-PLCC package with J-leads and is designed for surface mount installation.

Feature Summary

• Integrated 50-byte SRAM for data storage
• Hardware alarm and watchdog timer features
• Automatic leap year correction logic
• Programmable square wave output

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing non-volatile memory backup
• Embedded systems utilizing parallel bus architectures

Procurement Notes

Verify the specific ordering suffix T&R indicates tape and reel packaging when sourcing this component. Confirm that the 28-PLCC package dimensions match the target PCB footprint. Ensure the parallel interface requirements align with the host microcontroller's available I/O lines before procurement.

Selection Notes

Select this part for applications requiring a dedicated RTC with onboard SRAM and parallel connectivity. The -40°C to +85°C operating temperature range suits industrial environments. Consider the 7mA active current consumption against power budget constraints compared to lower-power serial RTC alternatives.

Part Context

This component belongs to the DS1284 series of real-time clocks. It serves as a direct replacement for legacy RTC designs requiring parallel interfaces. The device integrates battery switching capabilities to maintain time and data during primary power failures using a 2.4V to 3.5V backup supply.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the verified source material.