AutoStore or Power Up Recall, Switching Waveform

							STK12C68
AutoStore or Power Up RECALL
Parameter	Alt	Description			STK12C68		Unit
Parameter	Alt	Description			Min	Max	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

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. **

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Cypress manual AutoStore or Power Up Recall, Switching Waveform, Parameter Alt Description STK12C68 Unit Min Max, Hsb

Contents

Functional Description Features Pin Definitions Pin Configurations AutoStore Operation Device OperationSram Read Sram Write Software Store AutoStore Inhibit ModeHardware Recall Power Up Hardware Store HSB Operation Hardware Protect Low Average Active PowerData Protection Noise Considerations Best Practices Hardware Mode SelectionA12-A0 Mode Power Operating Range DC Electrical CharacteristicsRange Ambient Temperature Maximum Ratings AC Test Conditions Data Retention and EnduranceCapacitance Thermal Resistance Parameter AC Switching CharacteristicsSwitching Waveforms Sram Write Cycle HSB AutoStore or Power Up RecallSwitching Waveform Parameter Alt Description STK12C68 Unit Min Max Parameter Alt Description 25 ns 35 ns 45 ns Unit Min Software Controlled STORE/RECALL Cycle Hardware Store Cycle Hardware Store Cycle STK12C68-SF25ITR Part Numbering nomenclature STK12C68 S F 45 I TROrdering Information STK12C68-SF25TR STK12C68-SF45ITR Speed ns Ordering CodePackage Type Operating Range STK12C68-SF45TR Pin 300 Mil Pdip Pin 330 Mil Soic Pin 600 Mil Pdip Pin 300 Mil Side Braze DIL Pad 350 Mil LCC USB Sales, Solutions, and Legal InformationNew data sheet Document History

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

Models: STK12C68

STK12C68

AutoStore or Power Up RECALL

Parameter

Alt

Description

STK12C68

Unit

Min

Max

HSB

Switching Waveform

Figure 11. AutoStore/Power Up RECALL