| 摘要 |
PURPOSE:To give priority to an input signal of an FF over a clock signal by providing a switch MOSFET so as not to form a current path turned on/off complementarily with the MOSFET and connected directly to a power supply or ground. CONSTITUTION:P-channel switch MOS transistor (TR) TR2 and an N-channel switch MOSTR4 are provided in pairs with an N-channel MOSTR (NMOS)TR1 for set and a PMOSTR3 for reset. The TR2, TR4 are connected respectively in series between a data input MOS 4 and a power supply VDD and between MOS5 and ground. The MOSTR2, TR4 are turned on/off complementarily with the MOSTR1, TR3 by a set signal and a reset signal. A through-current is prevented by the switch MOSTR2, TR4 and the set and reset operation is guaranteed independently of the state of the clock signal. |
