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DDR3 termination value

Michi Yama
Guru 10030 points
Other Parts Discussed in Thread: AM3874

Hi,

I have a question regarding DDR3 termination value.

My customer uses DDR3 memory with AM3874.

According to the TRM of AM3874, the termination value is 50 ohms.

But generally speaking DDR3's termination value is 240 ohm, customer says.

Why is 50 ohms recommended for AM3874? Is it for impedance matching? or drive ability up?

The reason why 50 ohms termination recommende is important for PCB design of DDR3 pattern.

Please let me know.

Best regards,

Michi