SN74LS63N
SN74LS640-1DW
SN74LS640-1DWE4
SN74LS640-1DWG4
SN74LS640-1N
SN74LS640-1NE4
SN74LS640-1NS
SN74LS640-1NSE4
SN74LS640-1NSG4
SN74LS640-1NSR
19129491934(手机优先微信同号)