【Fairchild Semiconductor】74F190SCX,计数器 IC Up/Down Decade Ctr
【Fairchild Semiconductor】74F191PC,IC COUNTER DECADE UP/DOWN 16-DIP
【Fairchild Semiconductor】74F191PC_Q,计数器 IC Up/Down Binary Ctr
【Fairchild Semiconductor】74F191SC,IC COUNTER DECADE UP/DOWN 16SOIC
【Fairchild Semiconductor】74F191SCX,IC COUNTER BINARY UP/DWN 16SOIC
【Fairchild Semiconductor】74F191SJ,IC COUNTER BINARY UP/DWN 16SOP