| 摘要 |
PURPOSE:To immediately change the level of an output line and to attain the rapid operation of a system by adding a pull-up transistor(TR) to be driven by an one-shot pulse to an open drain type buffer. CONSTITUTION:The one-shot pulse generating circuit 102 generates a low level pulse 113 synchronously with the trailing edge of a control signal 101 for an n-channel TR QN 105 and inputs its output 103 to a p-channel TR QP104. At the leading edge 111 of the signal 101, the QN 105 is turned on and its output 106 is turned to a low level. At the trailing edge 112 of the signal 101, the signal 101 is turned to the low level, the QN 105 is turned off and the output 106 tries to keep its low level. Since the pulse 113 is generated on the output 103 of the circuit 102 and the QN 104 is turned on, the output 106 is immediately turned to a high level. |
