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STK22C48
Document Number: 001-51000 Rev. **
Page 10 of 14
AutoStore or Power Up RECALL
Parameter
Alt
Description
STK22C48
Unit
Min
Max
tHRECALL
[12]
tRESTORE
Power up RECALL Duration
550
μs
tSTORE
[14, 15]
tHLHZ
STORE Cycle Duration
10
ms
tDELAY
[13]
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
3.6
V
tVSBL
[10]
Low Voltage Trigger (VSWITCH) to HSB Low
300
ns
Switching Waveform
Figure 11. AutoStore/Power Up RECALL
WE
Notes
12. tHRECALL starts from the time VCC rises above VSWITCH.
13. CE and OE low for output behavior.
14. CE and OE low and WE high for output behavior.
15. 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.
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