×
Futurlec - The Electronic Components and Semiconductor Superstore
View Cart


DS1221 - Nonvolatile Controller X 4 Chip Datasheet

Photograph
DS1221 - Nonvolatile Controller X 4 Chip

Features

arrowControl Circuitry to Make CMOS RAM Nonvolatile

arrowControls up to 4 Memories

arrowMonitors Vcc and Write protects when out of Tolerance

arrowConsumes less than 100nA Battery Current

arrowTests Battery Condition on Start-Up

arrowSupports redundant batteries


Pin Layout
DS1221 Dallas Semiconductor IC Pin Layout

Pin Description
Pin Number Description
1 Vcco - RAM Supply
2 Vbat1 - +Battery 1
3 RST - Reset
4 A - Address Input A
5 B - Address Input B
6 RD - Read Input
7 WE - Write Enable
8 GND - Ground
9 D/Q - Data Input/Output
10 CE3 - Chip Enable Output 3
11 CE2 - Chip Enable Output 2
12 CE1 - Chip Enable Output 1
13 CE0 - Chip Enable Output 0
14 CE - Chip Enable Input
15 Vbat2 - +Battery 2
16 Vcci - +5V Supply

Dimensional Drawing
DS1221 DIP16 Dimension Drawing
DS1221 DIP16 Dimension Drawing

Technical Data

Data Sheet

   

Application Notes