Four-state I/O control circuit

Details Four-state I/O control circuit Four-state I/O control circuit

1986-07-24

1987-09-29

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307475, 307585, 3072471, H03K 17693

Patent

active

046971076

ABSTRACT:
An I/O control circuit is provided which is of the type that receives two inputs such that four sets of input conditions to the circuit are defined. A first set of input conditions establishes a low impedance path from the circuit output to the positive supply. A second set of input conditions establishes a low impedance path from the output to the negative supply, or ground. A third set of input conditions establishes a high impedance path from the output to both the positive and the negative supply. And, in accordance with the present invention, "pull-up" means is connected to the output such that the fourth set of input conditions establishes a path to the positive supply, the path having an impedance which is intermediate that of the low impedance and the high impedance. Alternatively, "pull-down down" means is connected to the output such that the fourth set of input conditions establishes an intermediate impedance path to the negative supply.

REFERENCES:
patent: 4158786 (1979-06-01), Hirasawa
patent: 4217502 (1980-08-01), Suzuki et al.
patent: 4242738 (1980-12-01), Dingwall
patent: 4281259 (1981-07-01), Ozawa
patent: 4309701 (1982-01-01), Nishimura
patent: 4408135 (1983-10-01), Yuyama et al.
patent: 4499388 (1985-02-01), Adam
patent: 4621208 (1986-11-01), Tran

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