G2993 Datasheet, PDF (9/10 Pages) Global Mixed-mode Technology Inc – DDR Termination Regulator

Global Mixed-mode Technology Inc.
G2993
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 G2993 in applications utilizing
DDR-II memory. Figure 6 is used to increase the driv-
ing capability. The risk is the same as figure 4.
V_DDQ=1.8V
AV_IN=1.8V or 5.5V
PV_IN=1.8V
C_IN ⁺
V_DDQ
AV_IN
PV_IN
V_TT
GND
V_TT=0.9V
+
C_OUT
Figure 5. Recommended DDR-II Termination
V_DDQ=1.8V
AV_IN=3.3V or 5.5V
PV_IN=3.3V
C_IN ⁺
V_DDQ
AV_IN
PV_IN
V_TT
GND
V_TT=0.9V
+
C_OUT
Figure 6. DDR-II Termination with higher voltage rails
Ver: 1.3
Jan 13, 2004
TEL: [phone]
http://www.gmt.com.tw
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