DataSheet8.cn


PDF ( 数据手册 , 数据表 ) STK15C88

零件编号 STK15C88
描述 32Kx8 PowerStore nvSRAM
制造商 Simtek
LOGO Simtek LOGO 



1 Page

No Preview Available !

STK15C88 数据手册, 描述, 功能
www.DataSheet4U.com
FEATURES
• 25, 45 ns Read Access & R/W Cycle Time
• Unlimited Read/Write Endurance
• Pin compatible with industry standard SRAMs
• Automatic Non-volatile STORE on Power Loss
• Automatic RECALL to SRAM on Power Up
• Non-Volatile STORE or RECALL under
Software Control
• Unlimited RECALL Cycles
• 1 Million Store Cycles
• 100-Year Non-volatile Data Retention
• Single 5V ± 10% Power Supply
• Commercial and Industrial Temperatures
• 28-pin 300-mil and 330 mil SOIC Packages
(RoHS-Compliant)
STK15C88
32Kx8 PowerStore nvSRAM
DESCRIPTION
The Simtek STK15C88 is a 256Kb fast static RAM
with a non-volatile Quantum Trap storage element
included with each memory cell.
The SRAM provides the fast access & cycle times,
ease of use and unlimited read & write endurance of
a normal SRAM.
Data transfers automatically to the non-volatile stor-
age cells when power loss is detected (the STORE
operation). On power up, data is automatically
restored to the SRAM (the RECALL operation). Both
STORE and RECALL operations are also available
under software control.
PowerStore nvSRAM products depend on the intrin-
sic system capacitance to maintain system power
long enough for an automatic store on power loss. If
the power ramp from 5 volts to 3.6 volts is faster
than 10 ms, consider our 14C88 or 16C88 for more
reliable operation.
The Simtek nvSRAM is the first monolithic non-vola-
tile memory to offer unlimited writes and reads. It is
the highest performance, most reliable non-volatile
memory available.
BLOCK DIAGRAM
A5
A6
A7
A8
A9
A11
A12
A13
A14
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
QUANTUM TRAP
512 x 512
STATIC RAM
ARRAY
512 X 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10
This product conforms to specifications per the
terms of Simtek standard warranty. The product
has completed Simtek internal qualification testing
and has reached production status.
1
STORE/
RECALL
CONTROL
SOFTWARE
DETECT
A13 – A0
G
E
W
Document Control #ML0016 Rev 0.3
February, 2007







STK15C88 pdf, 数据表
STK15C88
nvSRAM OPERATION
The STK15C88 is a versatile memory chip that pro-
vides several modes of operation. The STK15C88
can operate as a standard 32K x 8 SRAM. It has a
32K x 8 nonvolatile element shadow to which the
SRAM information can be copied, or from which the
SRAM can be updated in nonvolatile mode.
NOISE CONSIDERATIONS
Note that the STK15C88 is a high-speed memory
and so must have a high-frequency bypass capaci-
tor of approximately 0.1μF connected between VCC
and VSS, using leads and traces that are as short as
possible. As with all high-speed CMOS ICs, normal
careful routing of power, ground and signals will help
prevent noise problems.
SRAM READ
The STK15C88 performs a READ cycle whenever E
and G are low and W is high. The address specified
on pins A0-14 determines which of the 32,768 data
bytes will be accessed. When the READ is initiated
by an address transition, the outputs will be valid
after a delay of tAVQV (READ cycle #1). If the READ is
initiated by E or 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 tran-
sitions on any control input pins, and will remain valid
until another address change or until E or G is
brought high.
SRAM WRITE
A WRITE cycle is performed whenever E and W are
low. 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 writ-
ten into the 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
the common I/O lines. If G is left low, internal cir-
cuitry will turn off the output buffers tWLQZ after W
goes low.
SOFTWARE NONVOLATILE STORE
The STK15C88 software STORE cycle is initiated by
executing sequential READ cycles from six specific
address locations. During the STORE cycle an erase
of the previous nonvolatile data is first performed,
followed by a program of the nonvolatile elements.
The program operation copies the SRAM data into
nonvolatile memory. Once a STORE cycle is initi-
ated, further input and output are disabled until the
cycle is completed.
Because a sequence of READs from specific
addresses is used for STORE initiation, it is impor-
tant that no other READ or WRITE accesses inter-
vene in the sequence or the sequence will be
aborted and no STORE or RECALL will take place.
To initiate the software STORE cycle, the following
READ sequence must be performed:
1. Read address
2. Read address
3. Read address
4. Read address
5. Read address
6. Read address
0E38 (hex)
31C7 (hex)
03E0 (hex)
3C1F (hex)
303F (hex)
0FC0 (hex)
Valid READ
Valid READ
Valid READ
Valid READ
Valid READ
Initiate STORE cycle
The software sequence must be clocked with E con-
trolled READs.
Once the sixth address in the sequence has been
entered, the STORE cycle will commence and the
chip will be disabled. It is important that READ cycles
and not WRITE cycles be used in the sequence,
although it is not necessary that G be low for the
sequence to be valid. After the tSTORE cycle time has
been fulfilled, the SRAM will again be activated for
READ and WRITE operation.
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 READ operations must be
performed:
1. Read address
2. Read address
3. Read address
4. Read address
5. Read address
6. Read address
0E38 (hex)
31C7 (hex)
03E0 (hex)
3C1F (hex)
303F (hex)
0C63 (hex)
Valid READ
Valid READ
Valid READ
Valid READ
Valid READ
Initiate RECALL cycle
Document Control #ML0016 Rev 0.3
February, 2007
8














页数 14 页
下载[ STK15C88.PDF 数据手册 ]



分享链接

Link :

推荐数据表

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
STK15C8832Kx8 PowerStore nvSRAMSimtek
Simtek

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


www.DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap