DST310S32.768K DST310S32.768KHZ DST310S-32.768KHZ DST310S-32.768KHZ 9PF DST310S-32.768KHZ 12.5PF DST310S-32.768KHZ 9PF DST310S-32.768KHZ-20PPM DST310S-32.768KHZ9PF DST310S32.768MHZ DST311S32.768KHZ