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STK14EX8-TF45TR Fiches technique(PDF) 11 Page - Simtek Corporation

No de pièce STK14EX8-TF45TR
Description  512Kx8 Autostore nvSRAM
Download  18 Pages
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Fabricant  SIMTEK [Simtek Corporation]
Site Internet  http://www.simtek.com
Logo SIMTEK - Simtek Corporation

STK14EX8-TF45TR Fiches technique(HTML) 11 Page - Simtek Corporation

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STK14EC8
11
Simtek Confidential
April, 2007
Document Control #ML0060 Rev 1.0
Preliminary
nvSRAM
The STK14EC8 nvSRAM is made up of two func-
tional components paired in the same physical cell.
These are the SRAM memory cell and a nonvolatile
QuantumTrap cell. The SRAM memory cell operates
like a standard fast static RAM. Data in the SRAM
can be transferred to the nonvolatile cell (the
STORE operation), or from the nonvolatile cell to
SRAM (the RECALL operation). This unique archi-
tecture allows all cells to be stored and recalled in
parallel. During the STORE and RECALL operations
SRAM READ and WRITE operations are inhibited.
The STK14EC8 supports unlimited read and writes
like a typical SRAM. In addition, it provides unlimited
RECALL operations from the nonvolatile cells and
up to 200K STORE operations.
SRAM READ
The STK14EC8 performs a READ cycle whenever
E and G are low while W and HSB are high. The
address specified on pins A0-18 determine which of
the 524,288 data bytes will be accessed. When the
READ is initiated by an address transition, the out-
puts will be valid after a delay of tAVQV (READ cycle
#1). If the READ is initiated by E and G, the outputs
will be valid at tELQV or at tGLQV, whichever is later
(READ cycle #2). The data outputs will repeatedly
respond to address changes within the tAVQV
access time without the need for transitions on any
control input pins, and will remain valid until another
address change or until E or G is brought high, or W
and HSB is brought low.
SRAM WRITE
A WRITE cycle is performed whenever E and W are
low and HSB is high. The address inputs must be
stable prior to entering the WRITE cycle and must
remain stable until either E or W goes high at the
end of the cycle. The data on the common I/O pins
DQ0-7 will be written into memory if it is valid tDVWH
before the end of a W controlled WRITE or tDVEH
before the end of an E controlled WRITE.
It is recommended that G be kept high during the
entire WRITE cycle to avoid data bus contention on
common I/O lines. If G is left low, internal circuitry
will turn off the output buffers tWLQZ after W goes
low.
AutoStore OPERATION
The STK14EC8 stores data to nvSRAM using one
of three storage operations. These three operations
are Hardware Store (activated by HSB), Software
Store (activated by an address sequence), and
AutoStore (on power down).
AutoStore operation is a unique feature of Simtek
QuanumTrap technology that is enabled by default
on the STK14EC8.
During normal operation, the device will draw cur-
rent from VCC to charge a capacitor connected to
the VCAP pin. This stored charge will be used by the
chip to perform a single STORE operation. If the
voltage on the VCC pin drops below VSWITCH, the
part will automatically disconnect the VCAP pin from
VCC. A STORE operation will be initiated with power
provided by the VCAP capacitor.
Figure 3 shows the proper connection of the storage
capacitor (VCAP) for automatic store operation.
Refer to the DC CHARACTERISTICS table for the
size of VCAP. The voltage on the VCAP pin is driven
to 5V by a charge pump internal to the chip. A pull
up should be placed on W to hold it inactive during
power up. This pull-up is only effective if the W sig-
nal is tri-state during power up. Many MPU’s will tri-
state their controls on power up. This should be ver-
ified when using the pullup. When the nvSRAM
comes out on power-on-recall, the MPU must be
active or the W held inactive until the MPU comes
out of reset.
nvSRAM OPERATION
Figure 3: AutoStore Mode
vCAP
vCC
W
vCC


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