STK22C48
(V = 5.0V 10%)
e
AutoStore / POWER-UP RECALL
CC
SYMBOLS
NO.
STK22C48
PARAMETER
UNITS NOTES
Standard
Alternate
MIN
MAX
27
28
29
30
31
32
t
Power-up RECALL Duration
STORE Cycle Duration
550
10
μs
ms
ns
μs
V
r
p, s
l
RESTORE
t
t
t
t
t
STORE
VSBL
HLHZ
BLQZ
Low Voltage Trigger (V
) to HSB Low
300
SWITCH
Time Allowed to Complete SRAM Cycle
Low Voltage Trigger Level
1
o
DELAY
V
4.0
4.5
3.6
SWITCH
RESET
V
Low Voltage Reset Level
V
Note r: tRESTORE starts from the time VCC rises above VSWITCH
.
Note s: HSB is asserted low for 1μs when VCAP drops through VSWITCH. If an SRAM write has not taken place since the last nonvolatile cycle, HSB will be
released and no STORE will take place.
AutoStore / POWER-UP RECALL
V
CC
31
SWITCH
V
32
V
RESET
TM
AutoStore
POWER-UP RECALL
29
VSBL
28
STORE
27
RESTORE
t
t
t
HSB
30
DELAY
t
W
DQ (DATA OUT)
POWER-UP
RECALL
BROWN OUT
NO STORE
BROWN OUT
AutoStore
BROWN OUT
AutoStore
(NO SRAM WRITES)
NO RECALL
NO RECALL
RECALL WHEN
(V DID NOT GO
(V DID NOT GO
V
RETURNS
CC
CC
CC
BELOW V
)
BELOW V
)
ABOVE V
SWITCH
RESET
RESET
Rev 0.3
Document Control #ML0004
February 2007
7
SIMTEK [ SIMTEK CORPORATION ]
