Semiconductor device with electromagnetic radiation reduced

Details Semiconductor device with electromagnetic radiation reduced Semiconductor device with electromagnetic radiation reduced

1996-06-05

1998-01-13

Hudspeth, David R.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 28, 326101, H03K 1716

Patent

active

057083720

ABSTRACT:
In a semiconductor device in which power is supplied from an external power supply system, a first power supply system is connected to first terminals of power supply and ground and a digital inner circuit. The inner circuit includes a clock signal generating circuit, a driver for the clock signal, and circuits operating in response to the clock signal. A second power supply system is connected to second terminals of power supply and ground, the input terminal, the output terminal, and a digital interface circuit. The second power supply system is independent of the first power supply system. The interface circuit includes a MOS transistor for pulling up or down the input terminal and an output circuit which includes a MOS transistor driving an output terminal. The first power supply system is separated from the second power supply system, and the inner circuit is connected to the interface circuit through only signal lines.

REFERENCES:
patent: 4656370 (1987-04-01), Kanuma
patent: 4857765 (1989-08-01), Cahill et al.
patent: 5148048 (1992-09-01), Kawasaki et al.
patent: 5153457 (1992-10-01), Martin et al.
patent: 5168181 (1992-12-01), Baiocchi et al.
patent: 5223745 (1993-06-01), Ohannes et al.
patent: 5319260 (1994-06-01), Wanlass
patent: 5570046 (1996-10-01), Sharpe-Geisler

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