Semiconductor device and input and output circuits thereof

Details Semiconductor device and input and output circuits thereof Semiconductor device and input and output circuits thereof

1998-03-18

1999-12-28

Tokar, Michael

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 34, 326 88, 326 33, H03K 190175, H03K 1716, H03K 19003, H03K 19094

Patent

active

060086688

ABSTRACT:
In an input circuit of a semiconductor device, a CMOS inverter has first and second transistors connected in series between an external power supply and ground and complementarily operating in accordance with an input signal. The first and second transistors have a connection point connected to an output terminal. A first switching device is connected in parallel to the second transistor and turned on/off. A comparator compares a voltage from the external power supply with a predetermined reference voltage and outputs a reference signal representing a comparison result. A logic circuit performs a logical operation between the reference signal from the comparator and the input signal supplied to an input terminal of the CMOS inverter and ON/OFF-controls the first switching device on the basis of a logical operation result. The logic circuit turns off the first switching device when the reference signal from the comparator represents that the voltage from the external power supply is lower than the predetermined reference voltage, and otherwise, turns on/off the first switching device in accordance with a level of the input signal to the CMOS inverter.

REFERENCES:
patent: 4745305 (1988-05-01), Crafts
patent: 4902915 (1990-02-01), Tran
patent: 5047670 (1991-09-01), Tran
patent: 5612630 (1997-03-01), Wright et al.
patent: 5838168 (1998-11-01), Petersen
patent: 5914618 (1999-06-01), Mattos

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