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參數(shù)資料
| 型號： | μPD45256441 |
| 廠商： | NEC Corp. |
| 英文描述： | 256M-Bit Synchronous DRAM(256M 同步 動態(tài)RAM) |
| 中文描述： | 256M位同步DRAM（256M同步動態(tài)RAM）的 |
| 文件頁數(shù)： | 11/84頁 |
| 文件大小： | 1052K |
| 代理商： | ΜPD45256441 |
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11
μ
PD45256441,45256841,45256163
Preliminary Data Sheet
2. Commands
Mode register set command
(/CS, /RAS, /CAS, /WE = Low)
The
μ
PD45256xxx has a mode register that defines how the device
operates. In this command, A0 through A12, BA0 and BA1 are the data
input pins. After power on, the mode register set command must be
executed to initialize the device.
The mode register can be set only when all banks are in idle state.
During 2
CLK (t
RSC
) following this command, the
μ
PD45256xxx cannot
accept any other commands.
Activate command
(/CS, /RAS = Low, /CAS, /WE = High)
The
μ
PD45256xxx has four banks, each with 8,192 rows.
This command activates the bank selected by BA0 and BA1 and a row
address selected by A0 through A12.
This command corresponds to a conventional DRAM’s /RAS falling.
Precharge command
(/CS, /RAS, /WE = Low, /CAS = High)
This command begins precharge operation of the bank selected by BA0
and BA1. When A10 is High, all banks are precharged, regardless of BA0
and BA1. When A10 is Low, only the bank selected by BA0 and BA1 is
precharged.
After this command, the
μ
PD45256xxx can’t accept the activate
command to the precharging bank during t
RP
(precharge to activate
command period).
This command corresponds to a conventional DRAM’s /RAS rising.
Fig.1 Mode register set
command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
Add
A10
(Bank select)
Fig.2 Row address strobe and
bank activate command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
Add
A10
BA0, BA1
(Bank select)
Row
Row
Fig.3 Precharge command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
Add
A10
BA0, BA1
(Bank select)
(Precharge select)
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| PD4558C | 制造商:Panasonic Industrial Company 功能描述:IC |
| PD-45A | 功能描述:線性和開關(guān)式電源 40W 5V/3.2A 12V/2A RoHS:否 制造商:TDK-Lambda 產(chǎn)品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓（通道 1）:20 V 輸出電流（通道 1）:40 A 商用/醫(yī)用: 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:Rack 長度: 寬度: 高度: |
| PD-45B | 功能描述:線性和開關(guān)式電源 44.8W 5V/3.2A 24V/1.2A RoHS:否 制造商:TDK-Lambda 產(chǎn)品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓（通道 1）:20 V 輸出電流（通道 1）:40 A 商用/醫(yī)用: 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:Rack 長度: 寬度: 高度: |
| PD45VN6C100 | 制造商:Banner Engineering 功能描述:SENSOR, PHOTOELECTRIC, PICODOT, CONVERGENT LASER, FOCAL POINT, 1 |
| PD45VN6C100Q | 制造商:Banner Engineering 功能描述:Sensor, PicoDot, Convergent Laser, Focal Point: 102mm, Input 10-30VDC, Cable 2m |
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