MT47H64M16BT-37EA Datasheet, PDF (49/134 Pages) Micron Technology – DDR2 SDRAM

1Gb: x4, x8, x16 DDR2 SDRAM
Output Electrical Characteristics and Operating Conditions
Output Electrical Characteristics and Operating Conditions
Table 18: Differential AC Output Parameters
Parameter
AC differential cross-point voltage
AC differential voltage swing
Symbol
V_OX(AC)
Vswing
Min
0.50 × V_DDQ - 125
1.0
Max
0.50 × V_DDQ + 125
–
Units
mV
mV
Notes
1
Note:
1. The typical value of V_OX(AC) is expected to be about 0.5 × V_DDQ of the transmitting de-
vice and V_OX(AC) is expected to track variations in V_DDQ. V_OX(AC) indicates the voltage at
which differential output signals must cross.
Figure 14: Differential Output Signal Levels
V_DDQ
V_TR
Vswing
Crossing point
V_OX
V_CP
V_SSQ
Table 19: Output DC Current Drive
Parameter
Symbol
Value
Units
Notes
Output MIN source DC current
Output MIN sink DC current
I_OH
–13.4
mA
1, 2, 4
I_OL
13.4
mA
2, 3, 4
Notes:
1. For I_OH(DC); V_DDQ = 1.7V, V_OUT = 1,420mV. (V_OUT - V_DDQ)/I_OH must be less than 21Ω for
values of V_OUT between V_DDQ and V_DDQ - 280mV.
2. For I_OL(DC); V_DDQ = 1.7V, V_OUT = 280mV. V_OUT/I_OL must be less than 21Ω for values of V_OUT
between 0V and 280mV.
3. The DC value of V_REF applied to the receiving device is set to V_TT.
4. The values of I_OH(DC) and I_OL(DC) are based on the conditions given in Notes 1 and 2. They
are used to test device drive current capability to ensure V_IH,min plus a noise margin and
V_IL,max minus a noise margin are delivered to an SSTL_18 receiver. The actual current val-
ues are derived by shifting the desired driver operating point (see output IV curves)
along a 21Ω load line to define a convenient driver current for measurement.
PDF: 09005aef821ae8bf
1GbDDR2.pdf – Rev. V 6/10 EN
49
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