Cypress STK22C48 Manual De Usuario
STK22C48
Document Number: 001-51000 Rev. **
Page 10 of 14
AutoStore or Power Up RECALL
Parameter
Alt
Description
STK22C48
Unit
Min
Max
t
HRECALL
t
RESTORE
Power up RECALL Duration
550
μs
t
STORE
t
HLHZ
STORE Cycle Duration
10
ms
t
DELAY
t
HLQZ ,
t
BLQZ
Time Allowed to Complete SRAM Cycle
1
μs
V
SWITCH
Low Voltage Trigger Level
4.0
4.5
V
V
RESET
Low Voltage Reset Level
3.6
V
t
VSBL
Low Voltage Trigger (V
SWITCH
) to HSB Low
300
ns
Switching Waveform
Figure 11. AutoStore/Power Up RECALL
WE
Notes
12. t
HRECALL
starts from the time V
CC
rises above V
SWITCH
.
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 V
14. CE and OE low and WE high for output behavior.
15. 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.