DS1248WP-120

Overview

The DS1248WP-120+ is a nonvolatile SRAM integrated with a phantom clock, manufactured by Analog Devices Inc./Maxim Integrated. It provides 128K x 8 bits of memory and operates on a 3.3V supply (2.97V to 3.63V). The device features a parallel interface with a 120ns access time and utilizes a 34-PowerCap™ Module package for surface mount installation. It includes an embedded lithium energy cell that maintains calendar operation and retains RAM data during power loss, ensuring over 10 years of data retention at +25°C.

Feature Summary

• Integrates 128K x 8 NV SRAM with a phantom clock for real-time tracking
• Supports automatic leap year compensation valid up to the year 2100
• Features transparent write protection and battery switchover upon power failure
• Designed for direct connection to a separate PowerCap containing the battery and crystal

Applications

• Direct replacement for volatile static RAM or EEPROM in systems requiring persistent storage
• Embedded applications needing simultaneous nonvolatile memory and precise timekeeping
• Industrial control systems operating within the commercial temperature range of 0°C to +70°C

Procurement Notes

Verify the specific ordering suffix (+) confirms lead-free and RoHS compliance status as defined by the manufacturer. Confirm that the required PowerCap module (DS9034PCX+) is ordered separately, as it is not included with the DS1248WP-120+ component. Ensure the application design accommodates the surface-mountable board-only package format.

Selection Notes

Select the DS1248WP-120+ when a 3.3V logic interface and 120ns access speed are required for the memory portion. This model is suitable for commercial temperature environments (0°C to +70°C). For industrial temperature ranges (-40°C to +85°C), the DS1248WP-120IND+ variant must be selected instead. Ensure the system architecture supports the 64-bit pattern recognition sequence necessary to access the phantom clock registers.

Part Context

This component belongs to the DS1248 series of 1024K NV SRAMs with phantom clocks. It is pin-for-pin compatible with the DS1244P and DS1251P devices, facilitating upgrades or replacements in existing designs. The 'W' designation indicates the 3.3V voltage range, while 'P' denotes the PowerCap package style.

Replacement Considerations

The DS1248WP-120IND+ serves as the industrial temperature grade equivalent for this part number.