Cypress STK12C68 manual AutoStore or Power Up Recall, Switching Waveform, Hsb

							STK12C68
AutoStore or Power Up RECALL
Parameter	Alt	Description			STK12C68		Unit
					Min	Max
tHRECALL [13]	tRESTORE	Power up RECALL Duration				550	μs
tSTORE [14, 15, 16]	tHLHZ	STORE Cycle Duration				10	ms
tDELAY [9, 15]	tHLQZ , tBLQZ	Time Allowed to Complete SRAM Cycle			1		μs
VSWITCH		Low Voltage Trigger Level			4.0	4.5	V
VRESET		Low Voltage Reset Level				3.9	V
tVCCRISE		VCC Rise Time			150		μs
tVSBL[11]		Low Voltage Trigger (VSWITCH) to	HSB	Low		300	ns

Switching Waveform

Figure 11. AutoStore/Power Up RECALL

WE

Notes

13.tHRECALL starts from the time VCC rises above VSWITCH.

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

Document Number: 001-51027 Rev. ** Page 11 of 20

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