DS0321SV(40.000MHZ) DS0321SV/74.175824M+-100 DS0321SV/79.99188313M DS0321SV/79.991883M+-50 DS0321SV-100MHZ DS0321SV-18.432MHZ DS0321SV24M DS0321SW DS0323B6 DS03-254-02BE