欢迎访问ic37.com |
会员登录 免费注册
发布采购

X84256 参数 Datasheet PDF下载

X84256图片预览
型号: X84256
PDF下载: 下载PDF文件 查看货源
内容描述: UPORT节电器EEPROM [UPort Saver EEPROM]
分类和应用: 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
文件页数/大小: 15 页 / 72 K
品牌: XICOR [ XICOR INC. ]
 浏览型号X84256的Datasheet PDF文件第2页浏览型号X84256的Datasheet PDF文件第3页浏览型号X84256的Datasheet PDF文件第4页浏览型号X84256的Datasheet PDF文件第5页浏览型号X84256的Datasheet PDF文件第6页浏览型号X84256的Datasheet PDF文件第7页浏览型号X84256的Datasheet PDF文件第8页浏览型号X84256的Datasheet PDF文件第9页  
Preliminary
256K
X84256
µPort Saver EEPROM
DESCRIPTION
MPS
EEPROM
FEATURES
• Up to 10MHz data transfer rate
• 25ns Read Access Time
• Direct Interface to Microprocessors and
Microcontrollers
—Eliminates I/O port requirements
—No interface glue logic required
—Eliminates need for parallel to serial converters
• Low Power CMOS
—2.5V–5.5V and 5V ±10% Versions
—Standby Current Less than 1µA
—Active Current Less than 3mA
• Byte or Page Write Capable
—64-Byte Page Write Mode
• Typical Nonvolatile Write Cycle Time: 2ms
• High Reliability
—1,000,000 Endurance Cycles
—Guaranteed Data Retention: 100 Years
• Small Packages Options
—8, 16-Lead SOIC Packages
—14-Lead TSSOP Packages
—8-Lead XBGA Packages
The µPort Saver memories need no serial ports or spe-
cial hardware and connect to the processor memory bus.
Replacing bytewide data memory, the µPort Saver uses
bytewide memory control functions, takes a fraction of
the board space and consumes much less power.
Replacing serial memories, the µPort Saver provides all
the serial benefits, such as low cost, low power, low volt-
age, and small package size while releasing I/Os for
more important uses.
The µPort Saver memory outputs data within 25ns of an
active read signal. This is less than the read access time
of most hosts and provides “no-wait-state” operation.
This prevents bottlenecks on the bus. With rates to 10
MHz, the µPort Saver supplies data faster than required
by most host read cycle specifications. This eliminates
the need for software NOPs.
The µPort Saver memories communicate over one line
of the data bus using a sequence of standard bus read
and write operations. This “bit serial” interface allows the
µPort Saver to work well in 8-bit, 16 bit, 32-bit, and 64-bit
systems.
A Write Protect (WP) pin prevents inadvertent writes to
the memory.
Xicor EEPROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data reten-
tion is greater than 100 years.
BLOCK DIAGRAM
System Connection
µP
µC
DSP
ASIC
RISC
Ports
Saved
P0/CS
P1/CLK
P2/DI
P3/DO
A15
WP
Internal Block Diagram
MPS
H.V. GENERATION
TIMING & CONTROL
A0
D7
D0
OE
WE
CE
I/O
OE
WE
COMMAND
DECODE
AND
CONTROL
LOGIC
EEPROM
ARRAY
X
DEC
32K x 8
Y DECODE
DATA REGISTER
©
Xicor, Inc. 1998 Patents Pending
4005 1 8/24/99 WW
1
Characteristics subject to change without notice