数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

STK22C48-N25ITR 数据表(PDF) 8 Page - Simtek Corporation

部件名 STK22C48-N25ITR
功能描述  2Kx8 AutoStore nvSRAM
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  SIMTEK [Simtek Corporation]
网页  http://www.simtek.com
标志 SIMTEK - Simtek Corporation

STK22C48-N25ITR 数据表(HTML) 8 Page - Simtek Corporation

Back Button STK22C48-N25ITR Datasheet HTML 4Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 5Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 6Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 7Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 8Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 9Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 10Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 11Page - Simtek Corporation STK22C48-N25ITR Datasheet HTML 12Page - Simtek Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 15 page
background image
8
February 2007
Document Control #ML0004 Rev 0.3
STK22C48
nvSRAM OPERATION
The STK22C48 has two separate modes of opera-
tion: SRAM mode and nonvolatile mode. In SRAM
mode, the memory operates as a standard fast static
RAM
. In nonvolatile mode, data is transferred from
SRAM
to Nonvolatile Elements (the STORE opera-
tion) or from Nonvolatile Elements to SRAM (the
RECALL
operation). In this mode SRAM functions are
disabled.
NOISE CONSIDERATIONS
The STK22C48 is a high-speed memory and so
must have a high-frequency bypass capacitor of
approximately 0.1
μF connected between V
CAP and
V
SS, using leads and traces that are as short as pos-
sible. As with all high-speed CMOS ICs, normal care-
ful routing of power, ground and signals will help
prevent noise problems.
SRAM READ
The STK22C48 performs a READ cycle whenever E
and G are low and W and HSB are high. The
address specified on pins A
0-10 determines which of
the 2,048 data bytes will be accessed. When the
READ
is initiated by an address transition, the out-
puts will be valid after a delay of t
AVQV (READ cycle
#1). If the READ is initiated by E or G, the outputs will
be valid at t
ELQV or at tGLQV, whichever is later (READ
cycle #2). The data outputs will repeatedly respond to
address changes within the t
AVQV 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.
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
DQ
0-7 will be written into the memory if it is valid tDVWH
before the end of a W controlled WRITE or t
DVEH
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 t
WLQZ after W goes low.
POWER-UP RECALL
During power up, or after any low-power condition
(V
CAP < VRESET), an internal RECALL request will be
latched. When V
CAP once again exceeds the sense
voltage of V
SWITCH, a RECALL cycle will automatically
be initiated and will take t
RESTORE to complete.
If the STK22C48 is in a WRITE state at the end of
power-up RECALL, the SRAM data will be corrupted.
To help avoid this situation, a 10K Ohm resistor
should be connected either between W and system
V
CC or between E and system VCC.
AutoStore OPERATION
The STK22C48 can be powered in one of three
modes.
During normal AutoStore operation, the STK22C48
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 STK22C48 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
STK22C48 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 with the HSB pin. It is not permissible 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


类似零件编号 - STK22C48-N25ITR

制造商部件名数据表功能描述
logo
Simtek Corporation
STK22C48-NF25 SIMTEK-STK22C48-NF25 Datasheet
316Kb / 16P
   2Kx8 AutoStore nvSRAM
logo
Cypress Semiconductor
STK22C48-NF25 CYPRESS-STK22C48-NF25 Datasheet
514Kb / 14P
   16 Kbit (2K x 8) AutoStore nvSRAM
logo
Simtek Corporation
STK22C48-NF25I SIMTEK-STK22C48-NF25I Datasheet
316Kb / 16P
   2Kx8 AutoStore nvSRAM
logo
Cypress Semiconductor
STK22C48-NF25I CYPRESS-STK22C48-NF25I Datasheet
514Kb / 14P
   16 Kbit (2K x 8) AutoStore nvSRAM
logo
Simtek Corporation
STK22C48-NF25ITR SIMTEK-STK22C48-NF25ITR Datasheet
316Kb / 16P
   2Kx8 AutoStore nvSRAM
More results

类似说明 - STK22C48-N25ITR

制造商部件名数据表功能描述
logo
Simtek Corporation
STK22C48 SIMTEK-STK22C48_08 Datasheet
316Kb / 16P
   2Kx8 AutoStore nvSRAM
STK14C88-3 SIMTEK-STK14C88-3 Datasheet
492Kb / 17P
   32Kx8 AutoStore nvSRAM
STK14CA8 SIMTEK-STK14CA8 Datasheet
593Kb / 19P
   128Kx8 Autostore nvSRAM
STK16C88 SIMTEK-STK16C88_08 Datasheet
359Kb / 13P
   32Kx8 AutoStore nvSRAM
STK12C68 SIMTEK-STK12C68 Datasheet
524Kb / 20P
   8Kx8 AutoStore nvSRAM
STK14C88 SIMTEK-STK14C88 Datasheet
397Kb / 19P
   32Kx8 AutoStore nvSRAM
STK14D88 SIMTEK-STK14D88 Datasheet
564Kb / 19P
   32Kx8 Autostore nvSRAM
logo
Cypress Semiconductor
STK14D88 CYPRESS-STK14D88 Datasheet
422Kb / 17P
   32Kx8 AutoStore nvSRAM
logo
Simtek Corporation
STK14C88 SIMTEK-STK14C88_08 Datasheet
388Kb / 19P
   32Kx8 AutoStore nvSRAM
STK14C88-3 SIMTEK-STK14C88-3_08 Datasheet
425Kb / 18P
   32Kx8 AutoStore nvSRAM
More results


Html Pages

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


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com