欢迎访问ic37.com |
会员登录 免费注册
发布采购

EM68B16DVAA-6H 参数 Datasheet PDF下载

EM68B16DVAA-6H图片预览
型号: EM68B16DVAA-6H
PDF下载: 下载PDF文件 查看货源
内容描述: 32M ×16的移动DDR同步DRAM ( SDRAM ) [32M x 16 Mobile DDR Synchronous DRAM (SDRAM)]
分类和应用: 动态存储器双倍数据速率
文件页数/大小: 40 页 / 323 K
品牌: ETRON [ ETRON TECHNOLOGY, INC. ]
 浏览型号EM68B16DVAA-6H的Datasheet PDF文件第12页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第13页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第14页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第15页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第17页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第18页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第19页浏览型号EM68B16DVAA-6H的Datasheet PDF文件第20页  
EM68B16DVAA  
EtronTech  
2. Driver Strength should be selected based on actual system loading conditions. Figure 3, the AC Output Load  
Circuit, represents the reference load used in defining the relevant timing parameters of this device.The 20pF  
load capacitance is not expected to be a precise representation of either a typical system load or the  
production test environment but is appropriate for Full Driver Strength. Setting the output drivers to 1/2 Driver  
Strength, for a further example, is appropriate for a 10pF load.  
3. The specific requirement is that DQS be Valid (High or Low) on or before this CK edge. The case shown  
(DQS going from High-Z to logic Low) applies when no writes were previously in progress on the bus. If a  
previous write was in progress, DQS could be High at this time, depending on tDQSS  
.
4. Table 14. I/O Setup / Hold Slew Rate Derating  
I/O Setup/Hold Slew Rate (V/ns)  
t
DS (ps)  
0
tDH (ps)  
0
1.0  
0.8  
0.6  
+75  
+75  
+150  
+150  
This derating table is used to increase tDS / tDH in the case where the I/O slew rate is below 1.0V/ns  
5. Table 15. I/O Delta Rise / Fall Derating  
I/O Delta Rise / Fall Rate (ns/V)  
t
DS (ps)  
0
tDH (ps)  
0
1.0  
±0.25  
+50  
+50  
±0.50  
+100  
+100  
This derating table is used to increase tDS/tDH in the case where the DQ and DQS slew rates differ. The Delta  
Rise / Fall Rate is calculated as 1/SlewRate1-1/SlewRate2. For example, if SlewRate1 = 1.0V/ns and SlewRate2  
= 0.8V/ns, then the Delta Rise / Fall Rate = -0.25ns/V.  
6. There must be at least one clock (CK) pulse during the tXP period.  
7. tWTR is referenced from the positive clock edge after the last Data In pair.  
8. tWR is referenced from the positive clock edge after the last desired Data In pair.  
Etron Confidential  
16  
Rev. 1.0  
Mar. 2009  
 复制成功!