Patent ID: 6104218
Filing Date: 2000-08-15
Classification: H03K

Abstract:
A high breakdown voltage push-pull output circuit for a semiconductor device, comprising:a first control transistor element connected between a first voltage supply terminal and an output terminal;a second control transistor element connected between the output terminal and a second voltage supply terminal;a switching circuit for turning on or off said first and second control transistor elements in response to an input signal applied through an input terminal, to switch an output signal derived through the output terminal from a high level to a low level or vice versa, said switching circuit including an input transistor element having a control terminal to which the input signal is applied and at least one switching voltage transistor element connected in series to said input transistor element;a plurality of first voltage transistor elements connected between the first voltage supply terminal and the output terminal in series to said first control transistor element;a plurality of second voltage transistor elements connected between the output terminal and the second voltage supply terminal in series to said second control transistor element, the number of said switching voltage transistor elements being the same as the number of said first voltage transistor elements; anda bias circuit for dividing a supply voltage supplied between the first and second voltage supply terminals into a lower voltage, to apply the divided lower voltage to control terminals of said first and second voltage transistor elements, respectively.