CM519 32.768KHZ CM-519 32.768KHZ CM519 32.768KHZ 12.5PF 20PPM CM519 32.768KHZ 32.768K CM519 32.768KHZ精工 CM51932.768KDZCT CM519-32.768KDZCT CM519-32.768KDZC-UT CM51932.768KDZF CM51932.768KDZFT