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STK12C68-LF25 Scheda tecnica(PDF) 10 Page - Simtek Corporation

Il numero della parte STK12C68-LF25
Spiegazioni elettronici  8Kx8 AutoStore nvSRAM
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Produttore elettronici  SIMTEK [Simtek Corporation]
Homepage  http://www.simtek.com
Logo SIMTEK - Simtek Corporation

STK12C68-LF25 Scheda tecnica(HTML) 10 Page - Simtek Corporation

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10
February 2007
Document Control #ML0008 Rev 0.7
STK12C68 (SMD5962-94599)
+
1
14
28
27
26
15
1
14
28
27
26
15
1
14
28
27
26
15
Figure 2. AutoStore Mode
Figure 3. System Power Mode
Figure 4. AutoStore Inhibit Mode
SOFTWARE NONVOLATILE RECALL
A software RECALL cycle is initiated with a sequence
of READ operations in a manner similar to the soft-
ware STORE initiation. To initiate the RECALL cycle,
the following sequence of E controlled READ opera-
tions must be performed:
1. Read address
0000 (hex)
Valid READ
2. Read address
1555 (hex)
Valid READ
3. Read address
0AAA (hex)
Valid READ
4. Read address
1FFF (hex)
Valid READ
5. Read address
10F0 (hex)
Valid READ
6. Read address
0F0E (hex)
Initiate RECALL cycle
Internally, RECALL is a two-step procedure. First, the
SRAM
data is cleared, and second, the nonvolatile
information is transferred into the SRAM cells. After
the t
RECALL cycle time the SRAM will once again be
ready for READ and WRITE operations. The RECALL
operation in no way alters the data in the Nonvolatile
Elements. The nonvolatile data can be recalled an
unlimited number of times.
AutoStore OPERATION
The STK12C68 can be powered in one of three
modes.
During normal AutoStore operation, the STK12C68
will draw current from V
CCX to charge a capacitor
connected to the V
CAP pin. This stored charge will be
used by the chip to perform a single STORE opera-
tion. After power up, when the voltage on the V
CAP
pin drops below V
SWITCH, the part will automatically
disconnect the V
CAP pin from VCCX and initiate a
STORE
operation.
Figure 2 shows the proper connection of capacitors
for automatic store operation. A charge storage
capacitor having a capacity of between 68
μF and
220
μF (± 20%) rated at 6V should be provided.
In system power mode (Figure 3), both V
CCX and VCAP
are connected to the + 5V power supply without the
68
μF capacitor. In this mode the AutoStore function
of the STK12C68 will operate on the stored system
charge as power goes down. The user must, how-
ever, guarantee that V
CCX does not drop below 3.6V
during the 10ms STORE cycle.
If an automatic STORE on power loss is not required,
then V
CCX can be tied to ground and + 5V applied to
V
CAP (Figure 4). This is the AutoStore Inhibit mode, in
which the AutoStore function is disabled. If the
STK12C68 is operated in this configuration, refer-
ences to V
CCX should be changed to VCAP throughout
this data sheet. In this mode, STORE operations may
be triggered through software control or the HSB pin.
It is not permissible to change between these three
options “on the fly.”
In order to prevent unneeded STORE operations,
automatic STOREs as well as those initiated by
externally driving HSB low will be ignored unless at
least one WRITE operation has taken place since the
most recent STORE or RECALL cycle. Software initi-
ated STORE cycles are performed regardless of
whether a WRITE operation has taken place. An
optional pull-up resistor is shown connected to HSB.
This can be used to signal the system that the
AutoStore cycle is in progress.
If the power supply drops faster than 20
μs/volt
before V
CCX reaches VSWITCH, then a 2.2 ohm resistor
should be inserted between V
CCX and the system
supply to avoid momentary excess of current
between Vccx and Vcap.


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