HYB18H256321BF Datasheet, PDF (26/41 Pages) Qimonda AG – 256-Mbit GDDR3 Graphics RAM GDDR3 Graphics RAM

Internet Data Sheet
4.6
Pin Capacitances
HYB18H256321BF
256-Mbit GDDR3
TABLE 13
Pin Capacitances (VDDQ = 1.8 V, TA = 25°C, f = 1 MHz)
Parameter
Symbol
Min.
Max.
Unit
Note
Input capacitance:
CI,CCK
A0-A11, BA0-1, CKE, CS, CAS, RAS, WE, CKE, RES,CLK,CLK
Input capacitance:
CIO
DQ0-DQ31, RDQS0-RDQS3, WDQS0-WDQS3, DM0-DM3
1.0
2.5
pF
2.0
3.0
pF
4.7
Driver current characteristics
4.7.1
Driver IV characteristics at 40 Ohms
Figure 14 represents the driver Pull-Down and Pull-Up IV characteristics under process, voltage and temperature best and
worst case conditions. The actual Driver Pull-Down and Pull-Up current must lie between these two bounding curves. The value
of the external ZQ resistor is 240 Ω, setting the nominal driver output impedance to 40 Ω.












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FIGURE 14
40 Ohm Driver Pull-Down and Pull-Up Characteristics
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Table 14 lists the numerical values of the minimum and maximum allowed values of the output driver Pull-Down and Pull-Up
IV characteristics.
Rev. 0.80, 2007-09
26
09132007-07EM-7OYI