F54LS279DMQB F54LS273DMQB F54LS258DMQB F54LS251DMQB

54F112DMQB 54F14ADMQB 54F273DMQB 54FCT245DB 54LS74DMQB 芯片

全新54LS280LMQB 54LS279FMQB 54LS279DMQB 54LS273LMQB 54LS273F

贴片直插54LS259DMQB，54LS273/BRA，54LS74A/BCA，57C256F-55T