SN74LS689N
SN74LS691N
SN74LS697DW
SN74LS697DWE4
SN74LS697DWG4
SN74LS697N
SN74LS697NE4
SN74LS697NS
SN74LS697NSR
SN74LS697NSRE4
19129491934(手机优先微信同号)