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STK14C88-3 データシート(PDF) 11 Page - Simtek Corporation

部品番号 STK14C88-3
部品情報  32Kx8 AutoStore nvSRAM
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メーカー  SIMTEK [Simtek Corporation]
ホームページ  http://www.simtek.com
Logo SIMTEK - Simtek Corporation

STK14C88-3 データシート(HTML) 11 Page - Simtek Corporation

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11
STK14C88-3
February 2007
Document Control #ML0015 Rev 0.6
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 STK14C88-3 can be powered in one of three
modes.
During normal AutoStore operation, the STK14C88-
3 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 4.7V should be provided.
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 1 ohm resistor
should be inserted between V
CCX and the system
supply to avoid momentary excess of current
between Vccx and Vcap.
HSB OPERATION
The STK14C88-3 provides the HSB pin for control-
ling and acknowledging the STORE operations. The
HSB pin can be used to request a hardware STORE
cycle. When the HSB pin is driven low, the
STK14C88-3 will conditionally initiate a STORE oper-
ation after t
DELAY; an actual STORE cycle will only
begin if a WRITE to the SRAM took place since the
last STORE or RECALL cycle. The HSB pin also acts
as an open drain driver that is internally driven low
to indicate a busy condition while the STORE (initi-
ated by any means) is in progress. Pull up this pin
with an external 10K ohm resistor to VCAP if HSB is
used as a driver.
SRAM READ
and WRITE operations that are in
progress when HSB is driven low by any means are
given time to complete before the STORE operation
is initiated. After HSB goes low, the STK14C88-3
will continue SRAM operations for t
DELAY. During tDELAY,
multiple SRAM READ operations may take place. If a
WRITE
is in progress when HSB is pulled low it will
be allowed a time, t
DELAY, to complete. However, any
SRAM WRITE
cycles requested after HSB goes low
will be inhibited until HSB returns high.
The HSB pin can be used to synchronize multiple
STK14C88-3s while using a single larger capacitor.
To operate in this mode the HSB pin should be con-
nected together to the HSB pins from the other
STK14C88-3s. An external pull-up resistor to +3.3V
is required since HSB acts as an open drain pull-
down. The V
CAP pins from the other STK14C88-3
Figure 2: AutoStore Mode
*If HSB is not used, it should be left unconnected.
10kO*
+
1
16
17
32
31
30


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