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DDR2 (Double Data Rate 2) is a type of Synchronous Dynamic Random-Access Memory (SDRAM) that is the second generation of DDR memory, providing faster data transfer rates than its predecessor by doubling the transfer rate through its electrical interface. Key features of DDR2 include the ability to transfer data on both the rising and falling edges of the clock signal (double pumping), a lower operating voltage of 1.8V compared to DDR's 2.5V, and a 2x clock multiplier for improved throughput.

Key Characteristics

Double Data Rate: DDR2 transfers data on both the rising and falling edges of the clock signal, effectively doubling the data rate.

Improved Electrical Interface: The interface runs at twice the speed of the memory clock, further enhancing performance.

Lower Voltage: DDR2 operates at a lower voltage (1.8V) than its predecessor, leading to reduced power consumption and better heat dissipation.

Increased Clock Speeds: DDR2 supports higher bus speeds and clock frequencies, leading to greater overall performance.

JEDEC Standard: DDR2 was standardized by JEDEC in 2003.