DDR2 and DDR3 SDRAM Controller
Table 11. DDR3 SDRAM Interface DC Electrical Characteristics for GV (typ) = 1.5 V (continued)
DD
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Output leakage current
Notes:
I
–50
50
μA
3
OZ
1. GV is expected to be within 50 mV of the DRAM GV at all times.
DD
DD
2. MV
n is expected to be equal to 0.5 × GV , and to track GV DC variations as measured at the receiver.
REF
DD DD
n may not exceed ±1% of the DC value.
Peak-to-peak noise on MV
REF
3. Output leakage is measured with all outputs disabled, 0 V ≤ VOUT ≤ GV
.
DD
Table 12 provides the DDR SDRAM Controller interface capacitance for DDR2 and DDR3.
Table 12. DDR2 and DDR3 SDRAM Interface Capacitance for GV (typ)=1.8 V and 1.5 V
DD
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Input/output capacitance: DQ, DQS, DQS
Delta input/output capacitance: DQ, DQS, DQS
Note:
C
6
8
pF
pF
1, 2
1, 2
IO
C
—
0.5
DIO
1. This parameter is sampled. GV = 1.8 V ± 0.090 V (for DDR2), f = 1 MHz, T = 25°C, V
= GV /2, V
DD OUT
DD
A
OUT
(peak-to-peak) = 0.2 V.
2. This parameter is sampled. GV = 1.5 V ± 0.075 V (for DDR3), f = 1 MHz, T = 25°C, V
= GV /2, V
OUT
DD
A
OUT
DD
(peak-to-peak) = 0.175 V.
Table 13 provides the current draw characteristics for MV n.
REF
Table 13. Current Draw Characteristics for MV
n
REF
Parameter / Condition
Symbol
Min
Max
Unit
Note
Current draw for MV
n
DDR2 SDRAM
DDR3 SDRAM
I
n
—
1500
1250
μA
1
REF
MVREF
1. The voltage regulator for MV
n must be able to supply up to 1500 μA or 1250 uA current for DDR2 or DDR3 respectively.
REF
6.2
DDR2 and DDR3 SDRAM Interface AC Electrical Characteristics
This section provides the AC electrical characteristics for the DDR SDRAM Controller interface. The
DDR controller supports both DDR2 and DDR3 memories. Note that although the minimum data rate for
most off-the-shelf DDR3 DIMMs available is 800 MHz, JEDEC specification does allow the DDR3 to run
at the data rate as low as 606 MHz. Unless otherwise specified, the AC timing specifications described in
this section for DDR3 is applicable for data rate between 606 MHz and 800 MHz, as long as the DC and
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
20
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