| 摘要 |
PURPOSE:To prevent a short-circuit current from flowing in a transistor on which the signal is impressed even when an external input signal is in an unstable condition by providing a means with the output of the OR of an internal cell output signal and the external input signal as an internal cell input signal. CONSTITUTION:The title cell consists of diodes 2 and 3 and a resistance 1 for electrostatic protection, and P-channel transistors 4 and 5, N-channel transistors 6 and 7 and a driver 8 for driving to compose the OR. Since an input cell with the output of the OR of an internal cell output signal 11 and an external input signal 10 as an internal cell input 12 is built, the propagation of the external input signal 10 through the internal cell can be controlled by the internal cell output signal 11. Thus, even when the external input signal 10 is in the unstable condition, the condition is prevented from propagating to the inside and the short-circuit current can be prevented from flowing also inside the input cell to which the condition is inputted directly. |
