DS1244WP-120

Overview

The DS1244WP-120 is a 3.3V nonvolatile SRAM with an integrated phantom clock, housed in a 34-pin PowerCap module package. It provides 32K x 8 bits of memory and tracks time including hundredths of seconds, minutes, hours, days, date, months, and years. The device features automatic leap year compensation valid up to 2100 and maintains data for over 10 years via an embedded lithium energy cell. Operating voltage ranges from 2.97V to 3.63V, with a maximum timekeeping current of 7mA at 3.3V. It supports parallel interface communication and operates within a commercial temperature range of 0°C to +70°C.

Feature Summary

• 32K x 8 Nonvolatile SRAM with built-in real-time clock
• Phantom clock interface using serial bit stream pattern recognition
• Automatic leap year compensation valid through 2100
• Embedded lithium battery with electrical disconnection until first power application

Applications

• Direct replacement for volatile static RAM or EEPROM in systems requiring time-stamping
• Industrial control systems needing reliable calendar and timekeeping functions
• Data logging applications requiring long-term data retention without external backup circuits

Procurement Notes

Verify the specific suffix IND+ if industrial temperature rating (-40°C to +85°C) is required, as the base model specifies 0°C to +70°C. Confirm that the separate DS9034PCX+ PowerCap containing the battery and crystal is ordered, as it is not included with the IC. Ensure the design accommodates the surface-mountable 34-PowerCap module footprint.

Selection Notes

Select this component when a parallel interface is preferred over serial protocols like I2C or SPI. The 3.3V supply requirement distinguishes it from the 5V DS1244Y series. Consider the PowerCap module form factor for designs where the battery and crystal must be mounted after reflow soldering to protect them from high temperatures.

Part Context

This part belongs to the DS1244 family of NV SRAMs with phantom clocks. It is functionally similar to the DS1248P but utilizes the PowerCap module package instead of the EDIP DIP module. The 'W' indicates the 3.3V version, while 'P' denotes the PowerCap package. It replaces older volatile memory solutions by integrating timekeeping directly into the memory array.

Replacement Considerations

Pin-for-pin compatible with DS1248P and DS1251P PowerCap modules. For industrial temperature requirements, use DS1244WP-120IND+. For 5V operation, consider the DS1244YP-70+.