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DS1221 Datasheet Nonvolatile Controller X 4 Chip

Manufacturer: Dallas

Overview: DS1221 Nonvolatile Controller x 4 Chip www.dalsemi.com NOT RECOMMENDED FOR NEW DESIGNS, SEE DS1321 DATASHEET INSTEAD.

Datasheet Details

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

General 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.

DESCRIPTION The DS1221 Nonvolatile Controller x 4 Chip is a CMOS circuit which solves the application problem of converting CMOS RAMs into nonvolatile memories.

Key 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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DS1221 Distributor