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STK22C48
December 2002
6
Document Control # ML0004 rev 0.0
AutoStore™ / POWER-UP RECALL
(VCC = 5.0V ± 10%)e
Note r:
tRESTORE starts from the time VCC rises above VSWITCH.
Note s: HSB is asserted low for 1
µs 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
NO.
SYMBOLS
PARAMETER
STK22C48
UNITS NOTES
Standard
Alternate
MIN
MAX
27
tRESTORE
Power-up RECALL Duration
550
µsr
28
tSTORE
tHLHZ
STORE Cycle Duration
10
ms
p, s
29
tVSBL
Low Voltage Trigger (VSWITCH) to HSB Low
300
ns
l
30
tDELAY
tBLQZ
Time Allowed to Complete SRAM Cycle
1
µso
31
VSWITCH
Low Voltage Trigger Level
4.0
4.5
V
32
VRESET
Low Voltage Reset Level
3.6
V
30
tDELAY
29
tVSBL
POWER-UP
RECALL
BROWN OUT
NO STORE
(NO SRAM WRITES)
NO RECALL
(VCC DID NOT GO
BELOW VRESET)
BROWN OUT
AutoStore™
NO RECALL
(VCC DID NOT GO
BELOW VRESET)
BROWN OUT
AutoStore™
RECALL WHEN
VCC RETURNS
ABOVE VSWITCH
AutoStoreTM
HSB
W
DQ (DATA OUT)
28
tSTORE
27
tRESTORE
POWER-UP RECALL
31
VSWITCH
32
VRESET
VCC