Cypress Semiconductor Perform STK12C68 Uživatelský manuál stáhnout pdf (Strana 12)

STK12C68

Document Number: 001-51027 Rev. *G Page 12 of 22

AutoStore or Power-up RECALL

Parameter Alt Description

STK12C68

Unit

Min Max

HRECALL

[13]

RESTORE

Power-up RECALL duration – 550 s

STORE

[14, 15, 16]

HLHZ

STORE cycle duration – 10 ms

DELAY

[9, 15]

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 – 3.9 V

VCCRISE

rise time 150 – s

VSBL

[11]

Low voltage trigger (V

SWITCH

) to HSB Low – 300 ns

Switching Waveform

Figure 11. AutoStore/Power-up RECALL

Notes

13. t

HRECALL

starts from the time V

rises above V

SWITCH

14. CE

and OE low for output behavior.

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.

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