DS1221 - Nonvolatile Controller x 4 Chip

Dallas

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Datasheet Details

Part number	DS1221
Manufacturer	Dallas
File Size	134.19 KB
Description	Nonvolatile Controller x 4 Chip
Datasheet	DS1221_Dallas.pdf

DS1221 Product details

Description

A, B CE CE0 - CE3 VBAT1 VBAT2 RST VCCI VCCO RD WE D/Q - Address Inputs - Chip Enable Input - Chip Enable Outputs - + Battery 1 - + Battery 2 - Reset - +5V Supply - RAM Supply - Read Inpu - Write Input - Data Input/Output DS1221 16-Pin SOIC (300-mil) See Mech.Drawings Section Used with optional security circuit only and must be connected to ground in all other cases.

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 feature 16-pin 0.3-inch DIP saves PC board space Optional 16-pin SOIC surface mount package Optional industrial temperature range of -40°C to +85°C available PIN.

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Published: Jul 4, 2005 |