CMOS 74系列芯片全部资料，写硬件程序必备的资料！-CMOS 74 series chips all the information and writing the procedures necessary hardware information!

74HC4051文档说明，即芯片资料。最新版本-74HC4051 document explains that the chip data. The latest version

本设计通过proteus仿真实现一量程自动转换的数字电压表，数码管显示，采用AT89C51、ADC0808、74HC4051、LM358N等器件，共有200mV、2V、20V、145V四档量程。-This design by proteus simulation to achieve a range of automatic conversion of digital voltmeter, digital display, using