Internet Data Sheet
HYB18H256321BF
256-Mbit GDDR3
4.9
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 17 lists the numerical values of the minimum and maximum allowed values of the ADD/CMD termination IV
characteristic.
TABLE 17
Programmed Terminator Characteristics at 240 Ohm
Voltage (V)
Terminator Pull-Up Current (mA)
Voltage (V)
Terminator Pull-Up Current (mA)
Minimum
Maximum
Minimum
Maximum
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
-0.41
-0.80
-1.17
-1.53
-1.87
-2.20
-2.50
-2.79
-3.06
-3.32
-0.55
-1.07
-1.58
-2.06
-2.53
-2.97
-3.40
-3.80
-4.17
-4.53
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
-3.56
-3.79
-4.01
-4.23
-4.46
-4.68
-4.90
-5.11
—
-4.86
-5.21
-5.50
-5.83
-6.17
-6.52
-6.88
-7.21
-7.54
-7.85
—
Rev. 0.80, 2007-09
30
09132007-07EM-7OYI
QIMONDA [ QIMONDA AG ]
