DS1284QN

Overview

The DS1284QN 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 in a 28-PLCC package. The device supports time formats of HH:MM:SS:hh in both 12-hour and 24-hour modes, and date formats of YY-MM-DD-dd. It operates on a main supply voltage of 4.5V to 5.5V, consuming a maximum current of 7mA at 5V during timekeeping. A battery backup supply of 2.4V to 3.5V maintains operation. The unit includes 50 bytes of SRAM and features an alarm, leap year compensation, square wave output, and a watchdog timer.

Feature Summary

• Integrated clock/calendar with 50-byte SRAM
• Parallel bus interface for system connectivity
• Watchdog timer and alarm functionality
• Supports 12/24 hour time and YY-MM-DD-dd date formats

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing calendar tracking
• Embedded systems utilizing parallel microprocessor buses

Procurement Notes

Verify component status as the DS1284 series may be discontinued or subject to limited availability. Confirm RoHS compliance details through official manufacturer documentation before procurement. Ensure the specific ordering suffix matches the required package and temperature grade. Check for end-of-life notifications from Analog Devices to plan for potential obsolescence management.

Selection Notes

Select this component when a parallel interface RTC with integrated SRAM is required. Verify that the system power supply aligns with the 4.5V to 5.5V range. Ensure the PCB layout accommodates the 28-LCC (J-Lead) surface mount package dimensions of 11.51x11.51 mm. Confirm that the operating temperature range of -40°C to +85°C meets the environmental requirements of the target application.

Part Context

The DS1284QN belongs to the Maxim Integrated DS1284 family of real-time clocks. These devices are designed for applications requiring non-volatile timekeeping and data storage. The 'QN' suffix typically denotes the PLCC package variant within this product line, distinguishing it from DIP or other package options available in the broader series.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Consult Analog Devices technical support for direct replacements or pin-compatible alternatives if the DS1284QN is unavailable.