Electronic Components Datasheet Search |
|
G2995P1U Datasheet(PDF) 10 Page - Global Mixed-mode Technology Inc |
|
G2995P1U Datasheet(HTML) 10 Page - Global Mixed-mode Technology Inc |
10 / 12 page Ver: 1.7 May 10, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 10 G2995 Global Mixed-mode Technology Inc. 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 G2995 in applications utilizing DDR-II memory. Figure 6 is used to increase the driv- ing capability. The risk is the same as figure 4. 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). + + V DDQ AV IN V SENSE PV IN V TT GND V TT V DD C IN Figure 7. Increasing VTT by Level Shifting C OUT V DDQ R1 R2 + + V DDQ AV IN V SENSE PV IN V TT GND V TT V DD C IN Figure 8. Decreasing VTT by Level Shifting C OUT V DDQ R1 R2 + + V DDQ AV IN V SENSE PV IN V TT GND V TT V DD C IN Figure 7. Increasing VTT by Level Shifting C OUT V DDQ R1 R2 + + V DDQ AV IN V SENSE PV IN V TT GND V TT V DD C IN Figure 7. Increasing VTT by Level Shifting C OUT V DDQ R1 R2 + + V DDQ AV IN V SENSE PV IN V TT GND V TT V DD C IN Figure 8. Decreasing VTT by Level Shifting C OUT V DDQ R1 R2 + + V DDQ AV IN V SENSE PV IN V TT GND V TT V DD C IN Figure 8. Decreasing VTT by Level Shifting C OUT V DDQ R1 R2 + + + V REF V DDQ AV IN V SENSE PV IN V TT GND V TT=0.9V V REF=0.9V V DDQ=1.8V AV IN=1.8V or 5.5V C IN Figure 5. Recommended DDR-II Termination C OUT C REF PV IN=1.8V + + + V REF V DDQ AV IN V SENSE PV IN V TT GND V TT=0.9V V REF=0.9V V DDQ=1.8V AV IN=3.3V or 5.5V C IN Figure 6. DDR-II Termination with higher voltage rails C OUT C REF PV IN=3.3V + + + V REF V DDQ AV IN V SENSE PV IN V TT GND V TT=0.9V V REF=0.9V V DDQ=1.8V AV IN=1.8V or 5.5V C IN Figure 5. Recommended DDR-II Termination C OUT C REF PV IN=1.8V + + + V REF V DDQ AV IN V SENSE PV IN V TT GND V TT=0.9V V REF=0.9V V DDQ=1.8V AV IN=3.3V or 5.5V C IN Figure 6. DDR-II Termination with higher voltage rails C OUT C REF PV IN=3.3V |
Similar Part No. - G2995P1U |
|
Similar Description - G2995P1U |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |