SN74LS643N
SN74LS644-1N
SN74LS645-1DW
SN74LS645-1DWE4
SN74LS645-1DWG4
SN74LS645-1DWR
SN74LS645-1DWRE4
SN74LS645-1DWRG4
SN74LS645-1N
SN74LS645-1NE4
19129491934(手机优先微信同号)