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參數(shù)資料
| 型號(hào)： | 48SD3208 |
| 廠商： | Maxwell Technologies, Inc |
| 英文描述： | 256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks |
| 中文描述： | 256 MB的SDRAM的8梅格× 8位× 4，銀行 |
| 文件頁數(shù)： | 29/39頁 |
| 文件大?。?/td> | 589K |
| 代理商： | 48SD3208 |
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48SD3208
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All data sheets are subject to change without notice
2005 Maxwell Technologies
All rights reserved.
256Mb (8-Meg X 8-Bit X 4-Banks) SDRAM
01.10.05 Rev 2
Writing
Refresh
Auto-Refresh: All the banks must be precharged before executing an auto-refresh command. Since the
auto-refresh command updates the internal counter every time it is executed and determines the banks and
the ROW addresses to be refreshed, external address specification is not required. The refresh cycle is
8192 cycles / 6.4 ms. (8192 cycles are requires to refresh all the ROW addresses.) The output buffer
becomes High-Z after auto-refresh start. In addition, since a precharge has been completed by an internal
operation after the auto-refresh, an additional precharge operation by the precharge command is not
required.
Self-refresh:1 After executing a self-refresh command, the self-refresh operation continues while CKE is
held Low. During self-refresh operation, all ROW addresses are refreshed by the internal refresh timer. A
self-refresh is terminated by a self-refresh exit command. Before and after self-refresh mode, execute auto-
refresh to all refresh addresses in or within 6.4 ms period on the condition (1) and (2) below.
(1) Enter self-refresh mode within 7.8 us after either burst refresh or distributed refresh at equal interval until
all refresh addresses are completed.
(2) Start burst refresh or distributed refresh at equal interval to all refresh addreses within 7.8 us after exiting
from self-refresh mode.
Others
Power-down mode: The SDRAM enters power-down mode when CKE goes Low in the IDLE state. In
power-down mode, power consumption is suppressed by deactivating the input initial circuit. Power-down
mode continues while CKE is held Low. In addition, by setting CKE to High, the SDRAM exits from the
1. Do not use self refresh mode at temperatures above 70 °C.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 48SD6404RPFE | CAP 1200PF 100V CERAMIC MONO 5% |
| 48SD6404RPFH | 1500PF 100V 5% MONOLITH CERM CAP |
| 48SD6404RPFI | 256 Mb SDRAM 16-Meg X 4-Bit X 4-Banks |
| 48SD6404RPFK | 256 Mb SDRAM 16-Meg X 4-Bit X 4-Banks |
| 48SD6404 | CAP 2.2UF 50V CERAMIC MONO 20% |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 48SD3208RPFE | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks |
| 48SD3208RPFH | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks |
| 48SD3208RPFI | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks |
| 48SD3208RPFK | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks |
| 48SD6404 | 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:256 Mb SDRAM 16-Meg X 4-Bit X 4-Banks |
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