Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

STK14D88 Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers

Part No. STK14D88
Description  32K x 8 AutoStore nvSRAM CMOS Nonvolatile Static RAM
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ETC [List of Unclassifed Manufacturers]
Direct Link  
Logo ETC - List of Unclassifed Manufacturers

STK14D88 Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers

Back Button STK14D88 Datasheet HTML 7Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 8Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 9Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 10Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 11Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 12Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 13Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 14Page - List of Unclassifed Manufacturers STK14D88 Datasheet HTML 15Page - List of Unclassifed Manufacturers  
Zoom Inzoom in Zoom Outzoom out
 11 / 15 page
background image
STK14D88
April 2005
Document Control #ML0033 rev 1.2
11
nvSRAM
The STK14D88 nvSRAM is made up of two
functional components paired in the same physical
cell. These are a SRAM memory cell and a
nonvolatile QuantumTrap™ cell. The SRAM memory
cell operates as 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
architecture allows all cells to be stored and recalled
in parallel. During the STORE and RECALL
operations SRAM READ and WRITE operations are
inhibited. The STK14D88 supports unlimited reads
and writes just like a typical SRAM. In addition, it
provides unlimited RECALL operations
from the
nonvolatile cells and up to 1 million STORE
operations.
SRAM READ
The STK14D88 performs a READ cycle whenever
E
and G are low while W and HSB are high.
The address specified on pins A14-0 determines which
of the 32,752 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 transitions on
any control input pins, and will remain valid until
another address change or until E or G is brought
high, or W or HSB is brought low.
VCC
VCC
VCAP
W
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 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
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 STK14D88 stores data to nvSRAM using one of
three storage operations. These three operations are
Hardware Store, activated by HSB , Software Store,
actived by an address sequence, and AutoStore™, on
device power down.
AutoStore
™ operation is a unique feature of Simtek
QuantumTrap™
technology and is enabled by default
on the STK14D88.
During normal operation, the device will draw current
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 4 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.
To reduce unneeded nonvolatile stores, AutoStore™
and Hardware Store operations 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. The
HSB
signal can be monitored by the system to detect
an AutoStore™ cycle is in progress.
DEVICE OPERATION
Figure 4: AutoStore
TM Mode


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15 


Datasheet Download

Go To PDF Page

Related Electronics Part Number

Part No.DescriptionHtml ViewManufacturer
STK14C88 32K x 8 AutoStore nvSRAM QuantumTrap CMOS Nonvolatile Static RAM 1  2  3  4  5  More List of Unclassifed Manufacturers
STK15C88 32K x 8 AutoStore nvSRAM High Performance CMOS Nonvolatile Static RAM 1  2  3  4  5  More List of Unclassifed Manufacturers
STK14C88-M 32K x 8 AUTOSTORE nvSRAM QUANTUM TRAP CMOS NONVOLATILE STATIC RAM 1  2  3  4  5  More List of Unclassifed Manufacturers
STK12C68-C20 8k x 8 AUTOSTORE NVSRAM QUANTUM TRAP CMOS NONVOLATILE STATIC RAM 1  2  3  4  5  More List of Unclassifed Manufacturers
STK16C88 32K x 8 AutoStorePlus nvSRAM QuantumTrap CMOS Nonvolatile Static RAM 1  2  3  4  5  More List of Unclassifed Manufacturers
STK25CA8 128K x 8 AutoStore nvSRAM CMOS Nonvolatile Static RAM Module 1  2  3  4  5  More List of Unclassifed Manufacturers
STK12C68-IM CMOS nvSRAM 8K x 8 AutoStore Nonvolatile Static RAM Industrial Temperature/Military Screen 1  2  3  4  5  More List of Unclassifed Manufacturers
STK11C88 32K x 8 nvSRAM QUANTUM TRAP CMOS NONVOLATILE STATIC RAM 1  2  3  4  5  More List of Unclassifed Manufacturers
STK16C88-3 32K x 8 AutoStorePlus nvSRAM 3.3V QuantumTrap CMOS Nonvolatile Static RAM 1  2  3  4  5  More List of Unclassifed Manufacturers

Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn