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DS1221 - Nonvolatile Controller x 4 Chip

General Description

A, B CE CE0 - CE3 VBAT1 VBAT2 RST VCCI VCCO RD WE

DS1221 16-Pin SOIC (300-mil) See Mech.

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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Datasheet Details

Part number DS1221
Manufacturer Dallas
File Size 134.19 KB
Description Nonvolatile Controller x 4 Chip
Datasheet download datasheet DS1221 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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DS1221 Nonvolatile Controller x 4 Chip www.dalsemi.com NOT RECOMMENDED FOR NEW DESIGNS, SEE DS1321 DATASHEET INSTEAD. 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 ASSIGNMENT VCCO VBAT1 *RST A B *RD *WE GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCCI VBAT2 CE CE0 CE1 CE2 CE3 *D/Q DS1221 16-Pin DIP (300-mil) See Mech.