HYB18H512321AF
512-Mbit GDDR3
Electrical Characteristics
5.7.2
Termination IV Characteristic at 60 Ohms
Figure 67 represents the DQ termination Pull-Up IV characteristic under process, voltage and temperature best
and worst case conditions. The actual DQ termination Pull-Up current must lie between these two bounding
curves. The value of the external ZQ resistor is 240 Ω, setting the nominal DQ termination impedance to 60 Ω.
(Extended Mode Register programmed to ZQ/4).
60 Ohm Termination Characterstics
0,0
0,5
1,0
1,5
2,0
0
-5
-10
-15
-20
-25
-30
-35
VDDQ - Vout (V)
Figure 67 60 Ohm Active Termination Characteristic
Table 32 lists the numerical values of the minimum and maximum allowed values of the output driver termination
IV characteristic.
Table 32
Programmed Terminator Characteristics at 60 Ohm
Voltage (V)
Terminator Pull-Up Current
(mA)
Voltage (V)
Terminator Pull-Up Current
(mA)
Minimum
-1.63
-3.19
-4.69
-6.12
-7.49
-8.78
-10.01
-11.16
-12.25
-13.27
Maximum
-2.18
-4.28
-6.30
-8.25
-10.11
-11.89
-13.58
-15.19
-16.69
-18.11
Minimum
-14.23
-15.14
-16.04
-16.94
-17.82
-18.70
-19.58
-20.44
—
Maximum
-19.45
-20.83
-22.00
-23.33
-24.67
-26.09
-27.50
-28.86
-30.15
-31.38
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
—
Data Sheet
85
Rev. 1.73, 2005-08
05122004-B1L1-JEN8
QIMONDA [ QIMONDA AG ]
