STK22C48
AutoStore™/POWER-UP RECALL
SYMBOLS
NO.
Standard
Alternate
PARAMETER
MIN
MAX
(V
CC
= 5.0V
±
10%)
e
STK22C48
UNITS
NOTES
27
28
29
30
31
32
t
RESTORE
t
STORE
t
VSBL
t
DELAY
V
SWITCH
V
RESET
t
BLQZ
t
HLHZ
Power-up
RECALL
Duration
STORE
Cycle Duration
550
10
300
1
4.0
4.5
3.6
μ
s
r
p, s
l
o
ms
ns
μ
s
Low Voltage Trigger (V
SWITCH
) to HSB Low
Time Allowed to Complete SRAM Cycle
Low Voltage Trigger Level
Low Voltage Reset Level
V
V
Note r: t
RESTORE
starts from the time V
CC
rises above V
SWITCH
.
Note s: HSB is asserted low for 1
μ
s
when V
CAP
drops through V
SWITCH
. 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
V
SWITCH
32
V
RESET
AutoStore
TM
POWER-UP
RECALL
27
t
RESTORE
HSB
30
t
DELAY
W
29
t
VSBL
28
t
STORE
DQ (DATA OUT)
POWER-UP
RECALL
BROWN OUT
NO
STORE
(NO SRAM WRITES)
NO
RECALL
(V
CC
DID NOT GO
BELOW V
RESET
)
BROWN OUT
AutoStore
NO
RECALL
(V
CC
DID NOT GO
BELOW V
RESET
)
BROWN OUT
AutoStore
RECALL
WHEN
V
CC
RETURNS
ABOVE V
SWITCH
Document Control #ML0004 Rev 2.0
Feb, 2008
7
SIMTEK [ SIMTEK CORPORATION ]
