参数资料
| 型号： | CAT25256LI-G |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 256KBIT 10MHZ 8DIP |
| 标准包装： | 50 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 256K (32K x 8) |
| 速度： | 10MHz |
| 接口： | SPI 3 线串行 |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 808 (CN2011-ZH PDF) |
CAT25256
Pin Description
SI: The serial data input pin accepts op ? codes, addresses
and data. In SPI modes (0,0) and (1,1) input data is latched
on the rising edge of the SCK clock input.
SO: The serial data output pin is used to transfer data out of
the device. In SPI modes (0,0) and (1,1) data is shifted out
on the falling edge of the SCK clock.
SCK: The serial clock input pin accepts the clock provided
by the host and used for synchronizing communication
between host and CAT25256.
CS: The chip select input pin is used to enable/disable the
CAT25256. When CS is high, the SO output is tri ? stated (high
impedance) and the device is in Standby Mode (unless an
internal write operation is in progress). Every communication
session between host and CAT25256 must be preceded by a
high to low transition and concluded with a low to high
transition of the CS input.
WP: The write protect input pin will allow all write
operations to the device when held high. When WP pin is
tied low and the WPEN bit in the Status Register (refer to
Status Register description, later in this Data Sheet) is set to
“1”, writing to the Status Register is disabled.
Functional Description
The CAT25256 device supports the Serial Peripheral
Interface (SPI) bus protocol, modes (0,0) and (1,1). The
device contains an 8 ? bit instruction register. The instruction
set and associated op ? codes are listed in Table 10.
Reading data stored in the CAT25256 is accomplished by
simply providing the READ command and an address.
Writing to the CAT25256, in addition to a WRITE
command, address and data, also requires enabling the
device for writing by first setting certain bits in a Status
Register, as will be explained later.
After a high to low transition on the CS input pin, the
CAT25256 will accept any one of the six instruction
op ? codes listed in Table 10 and will ignore all other possible
8 ? bit combinations. The communication protocol follows
the timing from Figure 2.
The CAT25256, New Product Rev E features an
additional Identification Page (64 bytes) which can be
accessed for Read and Write operations when the IPL bit
from the Status Register is set to “1”. The user can also
choose to make the Identification Page permanent write
protected.
Table 10. INSTRUCTION SET
HOLD: The HOLD input pin is used to pause transmission
between host and CAT25256, without having to retransmit
the entire sequence at a later time. To pause, HOLD must be
taken low and to resume it must be taken back high, with the
SCK input low during both transitions. When not used for
pausing, it is recommended the HOLD input to be tied to
V CC , either directly or through a resistor.
Instruction
WREN
WRDI
RDSR
WRSR
READ
WRITE
Opcode
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
Operation
Enable Write Operations
Disable Write Operations
Read Status Register
Write Status Register
Read Data from Memory
Write Data to Memory
t CS
CS
t CNH
t CSS
t WH
t WL
t CSH
t CNS
SCK
SI
t SU
t H
VALID
IN
t RI
t FI
t V
t HO
t V
t DIS
SO
HI ? Z
VALID
OUT
HI ? Z
Figure 2. Synchronous Data Timing
http://onsemi.com
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT25256LI-G | 制造商:ON Semiconductor 功能描述:IC EEPROM 256KBIT SERIAL 10MHZ DIP-8 制造商:ON Semiconductor 功能描述:IC, EEPROM, 256KBIT, SERIAL, 10MHZ DIP-8 |
| CAT25256VI-G | 功能描述:电可擦除可编程只读存储器 (32kx8) 256K SPI 1.8 to 5.5V RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| CAT25256VI-G | 制造商:ON Semiconductor 功能描述:IC EEPROM 256KBIT SERIAL 10MHZ SOIC-8 |
| CAT25256VI-GT3 | 功能描述:电可擦除可编程只读存储器 256K SPI Serial CMOS 电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| CAT25256XE | 制造商:ON Semiconductor 功能描述: |
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