DS1244W-120IND+

Overview

The DS1244W-120IND+ is a 32K x 8 nonvolatile SRAM integrated with a phantom real-time clock, manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 2.97V to 3.63V and draws a maximum timekeeping current of 7mA at 3.3V. The device features automatic leap year compensation valid up to the year 2100 and supports both 12-hour and 24-hour time formats. Designed for industrial applications, it functions reliably between -40°C and +85°C. The component utilizes a parallel interface and is housed in a 28-pin EDIP module package.

Feature Summary

• Integrates 32KB NV SRAM with a phantom clock for simultaneous data storage and timekeeping
• Includes embedded lithium energy cell providing over 10 years of data retention without power
• Features automatic leap year compensation valid through the year 2100
• Supports 12-hour (with AM/PM) and 24-hour time formats

Applications

• Industrial systems requiring persistent timekeeping during power outages
• Data logging equipment needing nonvolatile memory backup
• Embedded controllers utilizing standard 28-pin JEDEC pinouts

Procurement Notes

Verify the specific suffix IND+ confirms the industrial temperature range (-40°C to +85°C) and lead-free compliance. Confirm the EDIP package variant matches the required through-hole mounting style. Ensure the design accounts for the separate ordering of the PowerCap if surface mount assembly is preferred over the DIP module.

Selection Notes

Select this model when a parallel interface is required for direct RAM replacement alongside RTC functionality. The 3.3V operating voltage distinguishes it from the 5V DS1244Y variants. Consider the 28-pin EDIP package for through-hole designs or the 34-pin PowerCap for surface-mount compatibility with replaceable batteries.

Part Context

This part belongs to the DS1244 series of 256K NV SRAMs with phantom clocks. The 'W' indicates the 3.3V version, while 'IND' specifies the industrial temperature grade. It serves as a drop-in replacement for volatile static RAM or EEPROM in legacy systems requiring time-stamped data retention.

Replacement Considerations

The DS1244P is the surface-mount equivalent using a PowerCap module. For 5V applications, the DS1244Y-70 is the corresponding variant. Direct pin-for-pin replacements are limited to other DS1244 family members with matching voltage and temperature ratings.