X20C17P-35 데이터 시트보기 (PDF) - Xicor -> Intersil

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X20C17P-35

High Speed AUTOSTORE™ NOVRAM

Xicor -> Intersil 

X20C17

AUTOSTORE Feature

The AUTOSTORE feature automatically saves the con-

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

bit shadow E2PROM at power-down. This circuitry in-

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.

The X20C17 automatically initiates a nonvolatile store

cycle whenever Vcc falls below the AUTOSTORE thresh-

old voltage (VASTH). VCC must remain above the

AUTOSTORE Cycle End Voltage (VASEND) for the dura-

tion of the store cycle (tASTO). The detailed timing for this

feature is illustrated in the AUTOSTORE timing dia-

gram, below. Once the AUTOSTORE cycle is initiated,

all other device functions are inhibited.

AUTOSTORE CYCLE Timing Diagram and Suggested AUTOSTORE Implementation Circuit

V CC

5

VCC

4

AUTOSTORE CYCLE IN PROGRESS VASTH

VASEND

3

2 tASTO

1

STORE TIME

TIME (ms)

2015 FHD F14

V CC

X20C17

22µF

2015 ILL F30.4

AUTOSTORE CYCLE LIMITS

Symbol

tASTO (5)

VASTH

VASEND (5)

Parameter

AUTOSTORE Cycle Time

AUTOSTORE Threshold Voltage

AUTOSTORE Cycle End Voltage

Note: (5) tASTO and VASEND are periodically sampled and not 100% tested.

Min.

4.0

3.5

X20C17

Max.

2.5

4.3

Units

ms

V

V

2015 PGM T15

8

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