HCF4024B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages. The HCF4024B is a ripple carry binary counter. All counter stages are master-slave flip-flops. The state of a counter advances one count on the negative transition of each input pulse; a high level on the RESET line resets the counter to its all zeros stage. Schmitt trigger action on the input pulse line permits unlimited clock rise and fall times. All inputs and outputs are buffered.
该文档介绍了M74HCT157,这是一款高速CMOS四通道2输入数字多路复用器。它具有高速、低功耗、与TTL输出兼容等特点。该器件由四个带有公共选择和 strobe 输入的2输入数字多路复用器组成。在 STROBE 输入保持高电平时,数据的选择被禁止,所有输出都变为低电平。SELECT 解码确定 A 或 B 输入是否路由到相应的 Y 输出。所有输入都配备了静电放电和瞬态过电压保护电路。