3225 4M 3.3V 20PPM 3225 4M OSC 3225 4M 晶体 3225 4PIN 32M 3225 4PIN 8M 3225 50M 3225 50M 10PF 3225 50M 10PF 10PPM 3225 50M 19PF 10PPM 3225 50M 20PF 10PPM