DS1251YP-70IND+

Overview

The DS1251YP-70IND+ is a nonvolatile SRAM integrated with a phantom clock real-time controller, manufactured by Analog Devices Inc./Maxim Integrated. It provides 512K x 8 bits of memory and operates within a voltage range of 4.5V to 5.5V. The device features an industrial temperature rating from -40°C to +85°C and utilizes a 34-pin PowerCap module package for surface mount installation. Timekeeping capabilities include automatic leap year compensation up to the year 2100, supporting both 12-hour and 24-hour formats.

Feature Summary

• Integrates 512K x 8 NV SRAM with a phantom clock RTC
• Supports parallel interface with 19 address lines (A0-A18)
• Includes embedded lithium energy source for data retention
• Features automatic leap year compensation valid through 2100

Applications

• Industrial systems requiring persistent timekeeping and data storage
• Embedded controllers needing direct replacement for volatile static RAM or EEPROM
• Equipment requiring battery-backed memory in surface-mount configurations

Procurement Notes

Verify that the separate DS9034PCX+ or DS9034I-PCX+ PowerCap modules are ordered, as they are required for operation but shipped separately. Confirm the specific suffix IND+ corresponds to the industrial temperature range (-40°C to +85°C) and 5.0V supply requirement. Ensure the application design accommodates the 34-PowerCap Module footprint.

Selection Notes

Select this component when a 5V logic system requires combined NVSRAM and RTC functionality in a surface-mount form factor. The 70ns access speed suits standard microcontroller buses. Consider the DS1251W variants only if the system operates at 3.3V, or the EDIP packages if through-hole mounting is preferred over the PowerCap surface-mount solution.

Part Context

This part belongs to the DS1251 series of 4096K NV SRAMs with phantom clocks. It is upward compatible with the DS1248 series. The 'P' designation indicates the PowerCap board-only package, distinguishing it from the self-contained EDIP DIP modules. The 'Y' suffix denotes the 5.0V operating voltage variant.

Replacement Considerations

Direct replacements include other DS1251 series parts such as DS1251YP-70+ for commercial temperature ranges. For 3.3V applications, the DS1251WP-120IND+ serves as a functional equivalent with adjusted timing parameters. Verify pin compatibility with existing layouts designed for the DS124x family.