Electronic digital logic circuitry – Interface – Logic level shifting
Patent
1995-07-25
1997-01-07
Westin, Edward P.
Electronic digital logic circuitry
Interface
Logic level shifting
326 68, 326116, 326117, H03K 190175
Patent
active
055921086
ABSTRACT:
An interface circuit includes an input current limiting circuit for limiting a current of an input signal fed from a preceding circuit, thereby outputting the current-limited signal to a following circuit which is constituted using a MES type transistor. The interface circuit also includes a level shifting circuit supplied with a first higher power supply voltage and a lower power supply voltage, for converting a level of the current-limited signal into a logic level of the following circuit which is supplied with a second higher power supply voltage. The interface circuit further includes a level judging circuit connected between the input current limiting circuit and the level shifting circuit, for judging a logic threshold level of the input signal based on a predetermined level reference voltage. By the constitution, it is possible to adapt the interface circuit for connection to the following circuit constituted using MES type transistors.
REFERENCES:
patent: 4853561 (1989-08-01), Gravok
patent: 4912745 (1990-03-01), Fitzpatrick
patent: 4968904 (1990-11-01), Yamashita
patent: 5045727 (1991-09-01), Danckaert et al.
patent: 5051626 (1991-09-01), Kajii
Fujitsu Limited
Sanders Andrew
Westin Edward P.
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