DS12885QN

Overview

The DS12885QN+ is a real-time clock and calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features a parallel interface and is housed in a 28-PLCC package with dimensions of 11.51x11.51 mm. The device operates within a supply voltage range of 4.5V to 5.5V, consuming a maximum current of 15mA during timekeeping. It supports battery backup voltages between 2.5V and 4V. The component provides 114 bytes of non-volatile SRAM and functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated real-time clock/calendar with alarm, daylight savings, leap year correction, and square wave output
• 114 bytes of battery-backed NVSRAM for data retention
• Parallel bus interface supporting 12/24 hour time formats and YY-MM-DD-dd date formats

Applications

• Industrial systems requiring precise timekeeping in harsh environments
• Data logging equipment needing non-volatile memory for timestamping
• Embedded controllers utilizing parallel interfaces for RTC integration

Procurement Notes

Verify the specific suffix 'QN' against the manufacturer's datasheet to confirm package type and temperature grade. Confirm RoHS compliance status as '+N' variants typically indicate lead-free construction, but official documentation must be consulted. Check for end-of-life notices or obsolescence warnings from Analog Devices before finalizing procurement plans.

Selection Notes

Select this component when a parallel interface is required for direct connection to legacy microcontrollers. Ensure the system design accommodates the 28-PLCC surface mount footprint. Verify that the available board space matches the 11.51x11.51 mm package dimensions and that the operating environment stays within the -40°C to +85°C range.

Part Context

The DS12885QN+ belongs to the Maxim Integrated DS12885 family of real-time clocks. These devices are designed as direct replacements for older DS1285 and DS1287 models. The family includes variations such as the DS12887 which integrates a crystal and lithium battery source into a single package.

Replacement Considerations

The DS12885T+ is listed as a direct replacement option for the DS12885 series, though it utilizes a 32-TQFP package instead of PLCC. Verify pinout compatibility and mechanical fit before substitution.