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    • 7. 发明授权
    • Interface circuit adaptive to high speed and low voltage operation
    • 接口电路适应于高速和低电压工作
    • US5512853A
    • 1996-04-30
    • US320068
    • 1994-10-07
    • Norio UenoToru Matsuyama
    • Norio UenoToru Matsuyama
    • G06F15/78H03K19/0175H03K19/0185H03L5/00H01L25/00H03B1/00H03K17/16
    • H03K19/018514
    • An interface circuit for interfacing between an integrated circuit (IC) on a transmitting side and an IC on a receiving side over a line on a printed circuit board comprises an output circuit implemented in the IC on the transmitting side and composed of a current source for supplying a given current and a switching circuit for cutting off the given current according to a binary signal and delivering the given current as a current signal to the line, and an input circuit implemented in the IC on the receiving side and composed of a transimpedance circuit whose input impedance is equal to the one of the line and which converts the current signal into a voltage signal, and a comparator for identifying the voltage signal relative to a given threshold voltage and reproducing the binary signal. This circuitry makes it possible to provide an interface circuit that can be implemented in a CMOS IC during CMOS processing and operated at a low voltage. A threshold voltage for use in identifying a signal on the receiving side is stabilized, thus realizing an interface circuit unsusceptible to influence of a change in CMOS processing or the like.
    • 用于在发送侧的集成电路(IC)和印刷电路板上的线路上的接收侧的IC之间进行接口的接口电路包括在发送侧的IC中实现的输出电路,并且由电流源 提供给定的电流和切换电路,用于根据二进制信号切断给定的电流,并将给定的电流作为电流信号传送到线路,以及在接收侧的IC中实现并由跨阻电路 其输入阻抗等于线路中的一个,并将电流信号转换为电压信号;以及比较器,用于识别相对于给定阈值电压的电压信号并再现二进制信号。 该电路使得可以提供在CMOS处理期间可以在CMOS IC中实现并在低电压下操作的接口电路。 用于识别接收侧的信号的阈值电压是稳定的,因此实现了不能影响CMOS处理等的改变的接口电路。