SDR DRAM

DDR SDRAM

DDR2 SDRAM

DDR3 SDRAM

Data Rate(Mb/s per pin)

66 ~ 133

200 ~ 400

400 ~ 800

800 ~ 1600

I/O Organization

x4 , x8 , x16

x4, x8, x16

x4, x8, x16

x4, x8, x16

Voltage

3.3V

2.5V

1.8V

1.5V

Interface

LVTTL

SSTL_2

SSTL_18

SSTL_15

No. of Banks

2/4

4

4/8

8/Chop 4

Prefetch

1Bit

2Bit

4Bit

8Bit

Burst Length

1,2,4,8 Page

2,4,8 Page

4,8 Page

8 Page

Bidirectional Strobe

None

Single Ended

Single Ended and Differential

Differential Only

DQ Driver Stremgth

Wide Envelope

Narrow Envelope

OCD Calibration

ZQ-Pin Calibration

Termination

-

On board

On board/ODT

DIMM/Dynamic ODT

Read Latency

CL = 1,2,3

CL = 1.5,2,2.5,3

CL = 2,3,4,5

CL = 5,6,7,8,9,10,11

Additional Latency

-

-

AL = 0,1,2,3,4

AL = 0, CL-1, CL-2

Write Latency

0

1

CL-1

5,6,7,8 + AL

Interruptes

Yes

Yes

Wr-Wr, Rd-Rd 4n only

Burst Chop forRd and Wr