DS1248YP-70

Overview

The DS1248YP-70+ is a nonvolatile SRAM integrated with a phantom clock, manufactured by Analog Devices Inc./Maxim Integrated. It features 1024K (128K x 8) of static RAM and an embedded lithium energy cell for data retention. The device operates on a 5V supply within the 4.5V to 5.5V range and supports a parallel interface with a 70ns access time. Designed for surface mount applications, it utilizes a 34-PowerCap Module package. The component maintains calendar operation and retains memory data during power loss, ensuring over 10 years of data retention.

Feature Summary

• Integrates 128K x 8 NV SRAM with a phantom clock for real-time tracking
• Embedded lithium battery provides backup power for data retention
• Automatic leap year compensation valid up to the year 2100
• Surface mountable 34-PowerCap Module package design

Applications

• Systems requiring nonvolatile memory with persistent timekeeping
• Industrial equipment needing reliable data logging
• Embedded controllers utilizing phantom clock communication protocols

Procurement Notes

Verify that the separate PowerCap module (DS9034PCX+) or (DS9034I-PCX+) is included in the assembly plan, as it is required for operation but ordered separately. Confirm the specific suffix indicates lead-free/RoHS compliance. Ensure the design accommodates the 34-PowerCap Module footprint and allows for top-mounting the PowerCap after solder reflow to protect the internal crystal and battery from high temperatures.

Selection Notes

Select the DS1248YP-70+ when a surface mount solution is preferred over the standard DIP module. This variant requires an external PowerCap containing the battery and crystal. For industrial temperature ranges (-40°C to +85°C), the DS1248YP-70IND+ must be selected instead. Verify that the system voltage aligns with the 5V specification, as 3.3V variants are distinct part numbers.

Part Context

This component belongs to the DS1248 series of 1024K NV SRAMs with phantom clocks. It serves as a direct replacement for volatile static RAM or EEPROM in systems requiring time-stamped data storage. The PowerCap version offers a low-profile surface mount alternative to the traditional EDIP package, facilitating automated PCB assembly while maintaining the functionality of the integrated real-time clock.

Replacement Considerations

Pin-for-pin compatible with DS1244P and DS1251P modules. When replacing DIP versions, ensure the new design supports the separate PowerCap mounting process.