DS1221 Datasheet - Dallas

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DS1221 Nonvolatile Controller x 4 Chip

DS1221 Nonvolatile Controller x 4 Chip www.dalsemi.com NOT RECOMMENDED FOR NEW DESIGNS, SEE DS1321 DATASHEET INSTEAD..
A, B CE CE0 - CE3 VBAT1 VBAT2. RST VCCI VCCO. RD. WE. D/Q - Address Inputs - Chip Enable Input - Chip Enable Outputs - + Battery.

DS1221_Dallas.pdf

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Datasheet Details

Part number:

DS1221

Manufacturer:

Dallas

File Size:

134.19 KB

Description:

Nonvolatile Controller x 4 Chip

Features

* Converts CMOS RAMs into nonvolatile memories Data is automatically protected during power loss 2-to-4 decoder provides for up to 4 CMOS RAMs Provides for redundant batteries Test battery condition on power-up Full ±10% operating range Unauthorized access can be prevented with optional security featu

Applications

* data integrity is paramount. In these applications it is often desirable to use two batteries to ensure reliability. The DS1221 provides an internal isolation switch which provides for connection of two batteries. During battery back-up operation the battery with the highest voltage is selected for

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