| 摘要 |
PURPOSE:To effectively reduce the through-current while keeping the drive capability by providing a switching element controlled by an output signal to a power supply side and a ground side. CONSTITUTION:P-channel and N-channel depletion transistors(TRs) QP3, QN3 are provided to a power supply side and ground side of a buffer of CMOS configuration and a gate terminal of each TR is used as an output terminal. When an input signal IN is at an H level, an output OUT goes to an L, the TR QN3 goes to a high impedance and the impedance of the TRQP3 is low. When the input IN changes from H to L, the resistance of the TRQP3, QN3 changes, the resistance of the TRQP3 becomes gradually larger than that of the TRQN3 and when the input IN is close to L, the resistance of the TRQN3 is large and the resistance of the TRQP3 is small. Thus, the through-current is reduced while keeping the drive capability. |
