用集成微型线路制成的Φ207系列小型板式指示器具有许多优点,但也有一些不足,如在一系列装置中必须具备带有数字指示的可逆脉冲计数器。作为Φ207系列的补充,按照已经统一了的Φ207型指示器的结构和电气参数,研制了一种可逆计数器。这种可逆计数器的结构如图1所示。由于采用了同步计数器的线路,达到了不低于2兆赫的快速性。指示器可以在三种状态下工作:信息的串行输入,信息的并行输入,由外加信号复位。 The Φ207 series of small plate indicators made with integrated microcircuits have many advantages, but there are also some disadvantages, such as having a reversible pulse counter with a digital indication on a series of devices. As a complement to the Φ207 series, a reversible counter has been developed in accordance with the unified structure and electrical parameters of the Φ207 indicator. The structure of this reversible counter is shown in Figure 1. Due to the use of synchronous counter circuit, reached the speed of not less than 2 MHz. Indicators can work in three states: serial input of information, parallel input of information, reset by applied signals.