DDR III

DDR II

DDR III

Data Rate

400 - 800 Mbps

800 - 1600 Mbps

System Assumption

2 slots (4 loads)

2 slots (4 loads)

Vdd/Vddq

1.8V ± 0.1V

1.5V ± 0.075V

Interface

SSTL_18

SSTL_15

Package

60 BGA for x4/x8
78 BGA for x4/x8

78 BGA for x4/x8
96 BGA for x16

Source Sync.

Bi-directional DQS
(single/diff. option)

Bi-directional DQS
(differential default)

Burst Length

BL = 4, 8
(4 bits prefetch)

BL = 4, 8
(8 bits prefetch)

# of Banks

512Mb: 4 banks
1Gb/2Gb: 8 banks

512Mb/1Gb/2Gb/
4Gb/8Gb: 8 banks

CL/tRCD/tRP

~15/15/15 ns

~12/12/12 ns

Reset

No

Yes

ODT

Yes

Yes

Driver Calibration

Off-Chip Driver
calibration

Self calibration
with ZQ pin