QA640896和QA640892B是台湾宏太科技研制的定时器专用IC。利用它可以组成精确的定时控制电路 ,而且设计简单 ,调试方便。文中介绍了该器件的主要特点、参数、功能和控制方法 ,给出了这两种器件的典型应用电路 The QA640896 and QA640892B are timer-specific ICs developed by Taiwan’s Acer Technologies. Use it to form a precise timing control circuit, and the design is simple, easy to debug. The paper introduces the main features of the device, parameters, functions and control methods, given the typical application of these two devices circuit