HOLTEK
芯片, DTMF接收器, SMD, SOP18
芯片, DTMF发生器, SMD, SOP14
接口, USB, 键盘编码器, USB 1.1, 4.4 V, 5.5 V, DIP, 40 引脚
芯片, DTMF发生器, SMD, SOP8
芯片, 实时时钟, TIMEKEEPER?