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参数资料
| 型号： | MR25H256CDF |
| 厂商： | Everspin Technologies Inc |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC MRAM 256KBIT 40MHZ 8DFN |
| 标准包装： | 490 |
| 格式 - 存储器： | RAM |
| 存储器类型： | MRAM（磁阻 RAM） |
| 存储容量： | 256K (32K x 8) |
| 速度： | 40MHz |
| 接口： | SPI 串行 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-VDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP，Small Flag（5x6） |
| 包装： | 托盘 |
| 其它名称： | 819-1038 |
MR25H256
2. SPI COMMUNICATIONS PROTOCOL
MR25H256 can be operated in either SPI Mode 0 (CPOL=0, CPHA =0) or SPI Mode 3 (CPOL=1, CPHA=1).
For both modes, inputs are captured on the rising edge of the clock and data outputs occur on the falling
edge of the clock. When not conveying data, SCK remains low for Mode 0; while in Mode 3, SCK is high. The
memory determines the mode of operation (Mode 0 or Mode 3) based upon the state of the SCK when CS
falls.
All memory transactions start when CS is brought low to the memory. The first byte is a command code. De-
pending upon the command, subsequent bytes of address are input. Data is either input or output. There
is only one command performed per CS active period. CS must go inactive before another command can
be accepted. To ensure proper part operation according to specifications, it is necessary to terminate each
access by raising CS at the end of a byte (a multiple of 8 clock cycles from CS dropping) to avoid partial or
aborted accesses.
Table 2.1 Command Codes
Instruction
WREN
WRDI
RDSR
WRSR
READ
WRITE
SLEEP
WAKE
Description
Write Enable
Write Disable
Read Status Register
Write Status Register
Read Data Bytes
Write Data Bytes
Enter Sleep Mode
Exit Sleep Mode
Binary Code
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
1011 1001
1010 1011
Hex Code
06h
04h
05h
01h
03h
02h
B9h
ABh
Address Bytes
0
0
0
0
2
2
0
0
Data Bytes
0
0
1
1
1 to ∞
1 to ∞
0
0
Status Register and Block Write Protection
The status register consists of the 8 bits listed in table 2.2. Status register bits BP0 and BP1 define the mem-
ory block arrays that are protected as described in table 2.3. The Status Register Write Disable bit (SRWD)
is used in conjunction with bit 1 (WEL) and the Write Protection pin (WP) as shown in table 2.4 to enable
writes to status register bits. The fast writing speed of MR25H256 does not require write status bits. The
state of bits 6,5,4, and 0 can be user modified and do not affect memory operation. All bits in the status
register are pre-set from the factory to the “0” state.
Table 2.2 Status Register Bit Assignments
Bit 7
SRWD
Bit 6
Don’t Care
Bit 5
Don’t Care
Bit 4
Don’t Care
Bit 3
BP1
Bit 2
BP0
Bit 1
WEL
Bit 0
Don’t Care
Copyright ? Everspin Technologies 2013
4
MR25H256 Rev. 9, 4/2013
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相关代理商/技术参数 |
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| MR25H256CDFR | 功能描述:NVRAM 256Kb 3.3V 32Kx8 Serial MRAM RoHS:否 制造商:Maxim Integrated 数据总线宽度:8 bit 存储容量:1024 Kbit 组织:128 K x 8 接口类型:Parallel 访问时间:70 ns 电源电压-最大:5.5 V 电源电压-最小:4.5 V 工作电流:85 mA 最大工作温度:+ 70 C 最小工作温度:0 C 封装 / 箱体:EDIP 封装:Tube |
| MR25H256MDC | 功能描述:NVRAM 256Kb 3.3V 32Kx8 Serial MRAM RoHS:否 制造商:Maxim Integrated 数据总线宽度:8 bit 存储容量:1024 Kbit 组织:128 K x 8 接口类型:Parallel 访问时间:70 ns 电源电压-最大:5.5 V 电源电压-最小:4.5 V 工作电流:85 mA 最大工作温度:+ 70 C 最小工作温度:0 C 封装 / 箱体:EDIP 封装:Tube |
| MR25H256MDCR | 功能描述:NVRAM 256Kb 3.3V 32Kx8 Serial MRAM RoHS:否 制造商:Maxim Integrated 数据总线宽度:8 bit 存储容量:1024 Kbit 组织:128 K x 8 接口类型:Parallel 访问时间:70 ns 电源电压-最大:5.5 V 电源电压-最小:4.5 V 工作电流:85 mA 最大工作温度:+ 70 C 最小工作温度:0 C 封装 / 箱体:EDIP 封装:Tube |
| MR25H256MDF | 功能描述:NVRAM 256Kb 3.3V 32Kx8 SPI Pre-Qual Sample MRAM RoHS:否 制造商:Maxim Integrated 数据总线宽度:8 bit 存储容量:1024 Kbit 组织:128 K x 8 接口类型:Parallel 访问时间:70 ns 电源电压-最大:5.5 V 电源电压-最小:4.5 V 工作电流:85 mA 最大工作温度:+ 70 C 最小工作温度:0 C 封装 / 箱体:EDIP 封装:Tube |
| MR25H256MDFR | 功能描述:NVRAM 256Kb 3.3V 32Kx8 SPI Pre-Qual Sample MRAM RoHS:否 制造商:Maxim Integrated 数据总线宽度:8 bit 存储容量:1024 Kbit 组织:128 K x 8 接口类型:Parallel 访问时间:70 ns 电源电压-最大:5.5 V 电源电压-最小:4.5 V 工作电流:85 mA 最大工作温度:+ 70 C 最小工作温度:0 C 封装 / 箱体:EDIP 封装:Tube |
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