Bi-directional bus isolation circuit

Details Bi-directional bus isolation circuit Bi-directional bus isolation circuit

1984-11-13

1986-11-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307242, 307443, 307453, 307468, 307572, H03K 19096, H03K 17693

Patent

active

046212027

ABSTRACT:
A bi-directional bus isolation circuit couples the logic state present on a primary bus to a polysilicon secondary bus or the logic state present on the secondary bus to the primary bus in response to a select signal. A first NOR gate has one input coupled to the primary bus and a second input for receiving the select signal. A first output transistor couples the secondary bus to ground in response to the first NOR gate providing a logic high output. A second NOR gate has a first input coupled to the secondary bus, and a second input for receiving the select signal. A second output transistor couples the primary bus to ground in response to the second NOR gate providing a logic high output.

REFERENCES:
patent: 4158147 (1979-06-01), Edwards
patent: 4313106 (1982-01-01), Hsu
patent: 4315167 (1982-02-01), Pelc
patent: 4446382 (1984-05-01), Moore et al.
patent: 4486753 (1984-12-01), Saeki et al.
patent: 4488066 (1984-12-01), Shoji
patent: 4516123 (1985-05-01), Shoji

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