X20C17

8

AUTOSTORE Feature

The AUTOSTORE feature automatically saves the con-

tents of the X20C17’s static RAM to the on-board bit-for-

sures that no data is lost during accidental power-downs

or general system crashes, and is ideal for microproces-

sor caching systems, embedded software systems, and

general system back-up memory.

AUTOSTORE CYCLE LIMITS

X20C17

Symbol

Parameter

Min.

Max.

Units

AUTOSTORE Cycle Time

2.5

ms

AUTOSTORE Threshold Voltage

4.0

4.3

V

AUTOSTORE Cycle End Voltage

3.5

V

2015 PGM T15

1

2

3

4

5

VCC

TIME (ms)

VASTH

VASEND

AUTOSTORE CYCLE IN PROGRESS

tASTO

STORE TIME

AUTOSTORE CYCLE Timing Diagram and Suggested AUTOSTORE Implementation Circuit

Note:

(5) t

The X20C17 automatically initiates a nonvolatile store

cycle whenever Vcc falls below the AUTOSTORE thresh-

feature is illustrated in the AUTOSTORE timing dia-

gram, below. Once the AUTOSTORE cycle is initiated,

all other device functions are inhibited.

2015 FHD F14

2015 ILL F30.4

X20C17

22µF

CC

V