HYB18H512321BF Datasheet, PDF (30/43 Pages) Qimonda AG – 512-Mbit GDDR3 Graphics RAM

Internet Data Sheet
HYB18H512321BF
512-Mbit GDDR3
5.9
Termination IV Characteristic at 240 Ohms
Figure 17 represents the ADD/CMD termination Pull-Up IV characteristic under process, voltage and temperature best and
worst case conditions. The actual ADD/CMD termination Pull-Up current must lie between these two bounding curves. The
value of the external ZQ resistor is 240 Ω, setting the nominal termination impedance to 240 Ω. (CKE = 1at the RES transition
during Power-Up for ADD/CMD terminations).










FIGURE 17
240 Ohm Active Termination Characteristic
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Table 19 lists the numerical values of the minimum and maximum allowed values of the ADD/CMD termination IV
characteristic.
Voltage (V)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Terminator Pull-Up Current (mA)
Minimum
-0.41
-0.80
-1.17
-1.53
-1.87
-2.20
-2.50
-2.79
-3.06
-3.32
Maximum
-0.55
-1.07
-1.58
-2.06
-2.53
-2.97
-3.40
-3.80
-4.17
-4.53
TABLE 19
Programmed Terminator Characteristics at 240 Ohm
Voltage (V)
Terminator Pull-Up Current (mA)
Minimum
Maximum
1.1
-3.56
-4.86
1.2
-3.79
-5.21
1.3
-4.01
-5.50
1.4
-4.23
-5.83
1.5
-4.46
-6.17
1.6
-4.68
-6.52
1.7
-4.90
-6.88
1.8
-5.11
-7.21
1.9
—
-7.54
2.0
—
-7.85
Rev. 1.1, 2007-09
30
05292007-WAU2-UU95