欢迎访问ic37.com |
会员登录 免费注册
发布采购

G2996P1UF 参数 Datasheet PDF下载

G2996P1UF图片预览
型号: G2996P1UF
PDF下载: 下载PDF文件 查看货源
内容描述: DDR I / II终端稳压器 [DDR I/II Termination Regulator]
分类和应用: 稳压器双倍数据速率
文件页数/大小: 13 页 / 282 K
品牌: GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
 浏览型号G2996P1UF的Datasheet PDF文件第5页浏览型号G2996P1UF的Datasheet PDF文件第6页浏览型号G2996P1UF的Datasheet PDF文件第7页浏览型号G2996P1UF的Datasheet PDF文件第8页浏览型号G2996P1UF的Datasheet PDF文件第9页浏览型号G2996P1UF的Datasheet PDF文件第10页浏览型号G2996P1UF的Datasheet PDF文件第12页浏览型号G2996P1UF的Datasheet PDF文件第13页  
Global Mixed-mode Technology Inc.  
G2996  
In Figure 5 & 6, they are the application configurations  
of DDR-II SDRAM bus terminations. Figure 5 is the  
typical application scheme of DDR-II SDRAM. With the  
separate VDDQ pin and an internal resistor divider, it  
is possible to use the G2996 in applications utilizing  
DDR-II memory. Figure 6 is used to increase the driv-  
ing capability. The risk is the same as figure 4.  
SD  
VREF  
VREF=0.9V  
CREF  
SD  
+
+
VDDQ  
VDDQ=1.8V  
VSENSE  
VTT  
AVIN=1.8V or 5.5V  
PVIN=1.8V  
AVIN  
PVIN  
VTT=0.9V  
COUT  
+
GND  
CIN  
Figure 5. Recommended DDR-II Termination  
SD  
VREF  
VREF=0.9V  
CREF  
SD  
+
VDDQ  
VDDQ=1.8V  
VSENSE  
VTT  
AVIN=3.3V or 5.5V  
PVIN=3.3V  
AVIN  
PVIN  
VTT=0.9V  
COUT  
+
+
GND  
CIN  
Figure 6. DDR-II Termination with higher voltage rails  
Figure 7 & 8 are used to scale the VTT to the wanted  
value when the standard voltages of SSTL-2 do not  
meet the requirements. Using R1 & R2, figure 7 can  
shift VTT up to VDDQ/2 * (1+R1/R2) and figure 8 can  
shift VTT down to VDDQ/2 * (1-R1/R2).  
VDDQ  
VDD  
VDDQ  
AVIN  
PVIN  
VTT  
VTT  
COUT  
R1  
R2  
+
VSENSE  
+
GND  
CIN  
Figure 7. Increasing VTT by Level Shifting  
R2  
VDDQ  
VDD  
VDDQ  
AVIN  
PVIN  
VSENSE  
R1  
VTT  
COUT  
VTT  
+
+
GND  
CIN  
Figure 8. Decreasing VTT by Level Shifting  
Ver: 2.3  
May 16, 2006  
TEL: 886-3-5788833  
http://www.gmt.com.tw  
11