DS1248W-120

Overview

The DS1248W-120+ is a nonvolatile SRAM integrated with a phantom clock real-time calendar and clock, manufactured by Analog Devices Inc./Maxim Integrated. It provides 128K x 8 bits of memory (1Mbit) and operates within a supply voltage range of 2.97V to 3.63V. The device features a parallel interface and supports time formats including HH:MM:SS:hh in both 12-hour and 24-hour modes, alongside a YY-MM-DD-dd date format. It utilizes a self-contained lithium energy source for data retention exceeding 10 years without power. The component is housed in a 32-pin EDIP module package designed for through-hole mounting.

Feature Summary

• Integrates 128K x 8 NV SRAM with a phantom clock RTC for simultaneous data storage and timekeeping
• Includes an embedded lithium energy cell that automatically switches on during power failures to maintain operation
• Features automatic leap year compensation valid up to the year 2100
• Ensures over 10 years of data retention in the absence of VCC power

Applications

• Systems requiring nonvolatile static RAM replacement
• Applications needing EEPROM replacement capabilities
• Equipment requiring precise calendar and timekeeping functions

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. The 'W' suffix indicates a 3.3V operating voltage, while 'Y' denotes 5V operation. Ensure the '+ ' suffix is present for lead-free/RoHS compliance. Confirm whether the EDIP or PowerCap module variant is required for the target PCB design.

Selection Notes

Select the DS1248W-120+ when a 3.3V supply is available and a 128KB nonvolatile memory solution with integrated timekeeping is needed. Compare against the DS1248Y-120+ if a 5V system is used. Consider the DS1248WP-120+ if surface-mount assembly is preferred, noting that the separate PowerCap battery module must be ordered independently.

Part Context

This component belongs to the DS1248 family of 1024K NV SRAMs with phantom clocks. It is pin-for-pin compatible with the DS1244P and DS1251P devices. The family offers variations in voltage (3.3V vs 5V), speed grades, and package types (EDIP vs PowerCap) to suit different industrial and commercial applications.

Replacement Considerations

Direct replacements include other variants within the DS1248 family such as the DS1248Y-120+ for 5V systems. For surface-mount requirements, the DS1248WP-120+ serves as the equivalent package option. Ensure any substitute maintains the 32-pin EDIP footprint and phantom clock protocol compatibility.