DS1644P-120+

Real Time Clock Overview

The DS1644P-120+ is a non-volatile real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features an 8-bit parallel interface and direct addressing for data access. The device includes 32KB of NVSRAM storage capacity and operates within a supply voltage range of 2.97V to 3.63V, with a dedicated 3V battery input. It supports HH:MM:SS:hh time formats in both 12-hour and 24-hour modes, alongside YY-MM-DD-dd date formatting. Key features include leap year compensation and operation across a temperature range of -40°C to +85°C. The component is housed in a 34-PowerCap module package.

Real Time Clock Feature Summary

• Integrated 32KB NVSRAM with phantom clock functionality
• 8-bit parallel interface with direct address access
• Leap year compensation and BCD formatted time/date
• Operates on 2.97V ~ 3.63V main supply with 3V backup

Real Time Clock Applications

• Industrial systems requiring persistent timekeeping during power loss
• Data logging equipment needing timestamp accuracy
• Embedded controllers utilizing parallel bus architectures

Real Time Clock Procurement Notes

Verify the specific suffix 'IND+' against the manufacturer's current datasheet to confirm industrial temperature rating (-40°C to +85°C) and lead-free status. Confirm availability as this component family may have discontinuation notices or obsolescence declarations from the manufacturer. Ensure the 34-PowerCap module footprint matches the target PCB design constraints.

Real Time Clock Selection Notes

Select this component when a parallel interface RTC with substantial non-volatile memory is required. Compare pin compatibility with the DS1244 series if space-constrained alternatives are needed. Verify that the microcontroller system supports the necessary parallel control signals and timing requirements for the 8-bit bus interface.

Real Time Clock Part Context

This part belongs to the Maxim Integrated DS1644/DS1244 family of phantom clock modules. These devices combine RTC functionality with NVSRAM to maintain system state and time without external batteries during main power outages. The 'P' suffix typically denotes the PowerCap module package style.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers for the DS1644P-120+ were not found in the provided source material.