DS26S10 DS26S10CJ DS26S10CN DS26S10CV DS26S10DCN DS26T0 DS26-T1N DS26-T1N 32.768kHz 12.5pF +/-100ppm DS26-T1N 32.768kHz 12.5pF +/-20ppm DS26-T1N 32.768kHz 12.5pF +/-30ppm