Cypress Semiconductor STK22C48 Manual de usuario descargar pdf (Pagina 11)

STK22C48

Document Number: 001-51000 Rev. *E Page 11 of 17

AutoStore or Power Up RECALL

Parameter Alt Description

STK22C48

Unit

Min Max

HRECALL

[14]

RESTORE

Power Up RECALL duration – 550 s

STORE

[15, 16]

HLHZ

STORE cycle duration – 10 ms

DELAY

[17]

HLQZ ,

BLQZ

Time allowed to complete SRAM cycle 1 – s

SWITCH

Low voltage trigger level 4.0 4.5 V

RESET

Low voltage reset level – 3.6 V

VSBL

[18]

Low voltage trigger (V

SWITCH

) to HSB Low – 300 ns

Switching Waveform

Figure 11. AutoStore/Power Up RECALL

Notes

14. t

HRECALL

starts from the time V

rises above V

SWITCH

15. CE

and OE low and WE high for output behavior.

16. HSB

is asserted low for 1us when V

CAP

drops through V

SWITCH

. If an SRAM Write has not taken place since the last nonvolatile cycle, HSB is released and no store

takes place.

17. CE

and OE low for output behavior.

18. HSB

must be high during SRAM Write cycles.

Not Recommended for New Designs. In production to support ongoing production programs only.

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Cypress Semiconductor STK22C48 Manual de usuario Pagina 11

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