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参数资料
| 型号： | W9725G6IB-18 |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | DRAM |
| 英文描述： | 16M X 16 DDR DRAM, 0.35 ns, PBGA84 |
| 封装： | 8 X 12.50 MM, ROHS COMPLIANT, WBGA-84 |
| 文件页数： | 14/69页 |
| 文件大小： | 1644K |
| 代理商： | W9725G6IB-18 |
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PRELIMINARY W9725G6IB
Publication Release Date:Nov. 14, 2008
- 21 -
Revision P04
the row being accessed will be precharged at the end of the WRITE burst; if Auto-precharge is not
selected, the row will remain open for subsequent accesses.
7.3.4.
Burst Read with Auto-precharge Command
(
CS = "L", RAS = "H", CAS ="L", WE = "H", BA0, BA1 = Bank, A10 = "H", A0 to A8 = Column
Address)
If A10 is HIGH when a Read Command is issued, the Read with Auto-precharge function is engaged.
The DDR2 SDRAM starts an Auto-precharge operation on the rising edge which is (AL + BL/2) cycles
later than the read with AP command if tRAS(min) and tRTP(min) are satisfied.
7.3.5.
Burst Write with Auto-precharge Command
(
CS = "L", RAS = "H", CAS = "L", WE = "L", BA0, BA1 = Bank, A10 = "H", A0 to A8 = Column
Address)
If A10 is HIGH when a Write Command is issued, the Write with Auto-precharge function is engaged.
The DDR2 SDRAM automatically begins precharge operation after the completion of the burst write
plus write recovery time (WR) programmed in the mode register.
7.3.6.
Precharge All Command
(
CS = "L", RAS = "L", CAS = "H", WE = "L", BA0, BA1 = Don’t Care, A10 = "H", A0 to A9 and
A11 to A12 = Don’t Care)
The Precharge All command precharge all banks simultaneously. Then all banks are switched to the
idle state.
7.3.7.
Self Refresh Entry Command
(
CS = "L", RAS = "L", CAS = "L", WE = "H", CKE = "L", BA0, BA1, A0 to A12 = Don’t Care)
The Self Refresh command can be used to retain data, even if the rest of the system is powered
down. When in the Self Refresh mode, the DDR2 SDRAM retains data without external clocking. The
DDR2 SDRAM device has a built-in timer to accommodate Self Refresh operation. ODT must be
turned off before issuing Self Refresh command, by either driving ODT pin LOW or using an EMRS
command. Once the command is registered, CKE must be held LOW to keep the device in Self
Refresh mode. The DLL is automatically disabled upon entering Self Refresh and is automatically
enabled upon exiting Self Refresh. When the DDR2 SDRAM has entered Self Refresh mode, all of the
external signals except CKE, are ”Don’t Care”.
The clock is internally disabled during self refresh operation to save power. The user may change the
external clock frequency or halt the external clock one clock after Self Refresh entry is registered;
however, the clock must be restarted and stable before the device can exit self refresh operation.
7.3.8.
Self Refresh Exit Command
(CKE = "H",
CS = "H" or CKE = "H", CS = "L", RAS = "H", CAS = "H", WE = "H", BA0, BA1,
A0 to A12 = Don’t Care)
The procedure for exiting Self Refresh requires a sequence of commands. First, the clock must be
stable prior to CKE going back HIGH. Once Self Refresh Exit is registered, a delay of at least tXSNR
must be satisfied before a valid command can be issued to the device to allow for any internal refresh
in progress. CKE must remain HIGH for the entire Self Refresh exit period tXSRD for proper operation
except for self refresh re-entry.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| W9725G6IB-25 | 功能描述:IC DDR2-800 SDRAM 256MB 84-WBGA RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:4K (512 x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.173"，4.40mm 宽） 供应商设备封装:8-MFP 包装:带卷 (TR) |
| W9725G6JB | 制造商:WINBOND 制造商全称:Winbond 功能描述:4M ? 4 BANKS ? 16 BIT DDR2 SDRAM |
| W9725G6JB-25 | 制造商:Winbond Electronics Corp 功能描述:DRAM Chip DDR2 SDRAM 256M-Bit 16Mx16 1.8V 84-Pin WBGA 制造商:Winbond Electronics 功能描述:512MB DDRII |
| W9725G6JB25I | 功能描述:IC DDR2 SDRAM 256MBIT 84WBGA RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:150 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:4K (2 x 256 x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:2.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-DFN（2x3） 包装:管件 产品目录页面:1445 (CN2011-ZH PDF) |
| W9725G6KB-18 | 制造商:Winbond Electronics 功能描述:IC MEMORY 制造商:Winbond Electronics Corp 功能描述:IC MEMORY |
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