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STK12C68-C20 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part No. STK12C68-C20
Description  8k x 8 AUTOSTORE NVSRAM QUANTUM TRAP CMOS NONVOLATILE STATIC RAM
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Maker  ETC [List of Unclassifed Manufacturers]
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STK12C68-C20 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers

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STK12C68
July 1999
4-46
AutoStore™/POWER-UP RECALL
(VCC = 5.0V ± 10%)
b, f
Note t:
tRESTORE starts from the time VCC rises above VSWITCH.
Note u:
HSB is asserted low for 1
µs when V
CAP 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
STK12C68
UNITS
NOTES
Standard
Alternate
MIN
MAX
27
tRESTORE
Power-up RECALL Duration
550
µst
28
tSTORE
tHLHZ
STORE Cycle Duration
10
ms
q, r, u
29
tVSBL
Low Voltage Trigger (VSWITCH) to HSB Low
300
ns
m
30
tDELAY
tBLQZ
Time Allowed to Complete SRAM Cycle
1
µsq
31
VSWITCH
Low Voltage Trigger Level
4.0
4.5
V
32
VRESET
Low Voltage Reset Level
3.9
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


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