| 摘要 |
PURPOSE:To make the operating permissible range by level ''1'' of input information hardly be changed even when a Vcc level is low or high by connecting a source of a depletion transistor (TR) to a drain of an enhancement TR of an input circuit having a conventional hysteresis characteristic. CONSTITUTION:When a level of an input terminal A is a threshold voltage of an enhancement TRQ2 or below with the level of the input terminal A transitted from ''0'' to ''1'', a TRQ3 is also turned off and an output terminal N1 of an E/D inverter is at level ''1''. The difference from a conventional circuit resides in that a source and a gate of a depletion TRQ6 being a constant current TR are connected to a drain of an enhancement TRQ5 being the 2nd driving circuit, a drain of a depletion TRQ6 is connected to a Vcc, thereby making hardly changed the operating permissible range of input information level ''1'' at the input terminal A depending on the difference of the level of the Vcc. |
