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STK14C88-NF25TR 데이터시트(PDF) 10 Page - Simtek Corporation

부품명 STK14C88-NF25TR
상세설명  32Kx8 AutoStore nvSRAM
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제조업체  SIMTEK [Simtek Corporation]
홈페이지  http://www.simtek.com
Logo SIMTEK - Simtek Corporation

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10
February, 2007
Document Control #ML0014 Rev 0.3
STK14C88
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
0E38 (hex)
Valid READ
2.
Read address
31C7 (hex)
Valid READ
3.
Read address
03E0 (hex)
Valid READ
4.
Read address
3C1F (hex)
Valid READ
5.
Read address
303F (hex)
Valid READ
6.
Read address
0C63 (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 STK14C88 can be powered in one of three
modes.
During normal AutoStore operation, the STK14C88
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 V
CCX
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
V
CAP are connected to the + 5V power supply without
the 68
μF capacitor. In this mode the AutoStore func-
tion of the STK14C88 will operate on the stored sys-
tem charge as power goes down. The user must,
however, 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
STK14C88 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 permissable 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-
initiated STORE cycles are performed regardless of
whether a WRITE operation has taken place.
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.
Figure 2: AutoStore Mode
1
16
32
31
17
30
+
10k
Ω∗
Figure 3: System Power Mode
1
16
32
31
17
30
Figure 4: AutoStore
Inhibit Mode
1
16
32
31
17
30
*If HSB is not used, it should be left unconnected.


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