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MT48LC4M16A2P-75G 参数 Datasheet PDF下载

MT48LC4M16A2P-75G图片预览
型号: MT48LC4M16A2P-75G
PDF下载: 下载PDF文件 查看货源
内容描述: SDR SDRAM MT48LC16M4A2 â ????梅格4 ×4× 4银行MT48LC8M8A2 â ???? 2梅格×8× 4银行MT48LC4M16A2 â ???? 1梅格×16× 4银行 [SDR SDRAM MT48LC16M4A2 – 4 Meg x 4 x 4 Banks MT48LC8M8A2 – 2 Meg x 8 x 4 Banks MT48LC4M16A2 – 1 Meg x 16 x 4 Banks]
分类和应用: 动态存储器
文件页数/大小: 83 页 / 3595 K
品牌: MICRON [ MICRON TECHNOLOGY ]
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64Mb: x4, x8, x16 SDRAM  
SELF REFRESH Operation  
SELF REFRESH Operation  
The self refresh mode can be used to retain data in the device, even when the rest of the  
system is powered down. When in self refresh mode, the device retains data without ex-  
ternal clocking. The SELF REFRESH command is initiated like an AUTO REFRESH com-  
mand, except CKE is disabled (LOW). After the SELF REFRESH command is registered,  
all the inputs to the device become “Don’t Care” with the exception of CKE, which must  
remain LOW.  
After self refresh mode is engaged, the device provides its own internal clocking, ena-  
bling it to perform its own AUTO REFRESH cycles. The device must remain in self re-  
fresh mode for a minimum period equal to tRAS and remains in self refresh mode for an  
indefinite period beyond that.  
The procedure for exiting self refresh requires a sequence of commands. First, CLK  
must be stable prior to CKE going back HIGH. (Stable clock is defined as a signal cycling  
within timing constraints specified for the clock ball.) After CKE is HIGH, the device  
must have NOP commands issued for a minimum of two clocks for tXSR because time is  
required for the completion of any internal refresh in progress.  
Upon exiting the self refresh mode, AUTO REFRESH commands must be issued accord-  
ing to the distributed refresh rate (tREF/refresh row count) as both SELF REFRESH and  
AUTO REFRESH utilize the row refresh counter.  
PDF: 09005aef80725c0b  
64mb_x4x8x16_sdram.pdf - Rev. U 05/13 EN  
Micron Technology, Inc. reserves the right to change products or specifications without notice.  
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© 1999 Micron Technology, Inc. All rights reserved.