型号:DM74LS243MX
DM74LS243N
DM74LS244N
DM74LS244N-HD74LS244P
DM74LS244SJ
DM74LS244SJX
DM74LS244WM
DM74LS244WMX
DM74LS245N
DM74LS245SJ
DM74LS245SJX
DM74LS245WM
DM74LS245WMX
DM74LS251M
DM74LS251MX
DM74LS251N
DM74LS253M
DM74LS253MX
DM74LS253N
DM74LS257BM
DM74LS257BMX
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