| 摘要 |
PROBLEM TO BE SOLVED: To generate an output signal that has a relatively high voltage level from a chip which is manufactured in the process of a relatively low voltage level. SOLUTION: A control signal logic circuit 15 receives three V data signal from an internal logic circuit of a chip and generates a control signal as a function of the data signal. A pseudo-ground generating circuit 17 is connected to the control signal logic circuit and generates a pseudo-ground that exceeds zero V and an intermediate output signal as a function of the control signal generated by the control signal logic circuit. An output signal generating circuit 19 is connected to the pseudo-ground generating circuit and generates five V output signal as a function of the intermediate output signal generated by the pseudo-ground generating circuit. As a result of pseudo-ground generation, voltage difference that is exposed to a semiconductor device in an output circuit is always less than five V, prevents an oxide layer of the semiconductor of the output circuit from deteriorating in an early stage and does not invite early deterioration of the chip, and a three V process chip interfaces with a five V process device. |
