Signal distributing unit for various input signals different in

Details Signal distributing unit for various input signals different in Signal distributing unit for various input signals different in

1989-12-18

1991-01-01

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307469, 3072962, 36518903, H03K 1710

Patent

active

049821130

ABSTRACT:
For presenting a multipurpose signal pin provided in a semiconductor memory device from undesirable internal leakage current, a signal distributing unit has an inverter circuit responsive to a first external signal of either first and second voltage level for providing the second and first voltage level to a first internal control signal line and a gating circuit operative to block the first external signal but to transfer a second external signal of an extremely high voltage level to a second internal control signal line, and the gating circuit comprises a limiter transistor operative to keep off in the presence of the second external signal but to provide the second voltage level in the presence of the first external signal and a series combination of first and second gating transistors coupled to the multipurpose signal pin and associated with a voltage control circuit for producing gate control signals fed to the first and second gating transistors as well as a back gate biasing signal fed to the second gating transistor, wherein the first and second gating transistors are opposite in channel conductivity type so as to block the second voltage level on the second internal signal line to the multipurpose signal pin.

REFERENCES:
patent: 4350906 (1982-09-01), Gillberg
patent: 4565932 (1986-01-01), Kuo et al.
patent: 4616143 (1986-10-01), Miyamoto
patent: 4682052 (1987-07-01), Kyomasu
patent: 4697101 (1987-09-01), Iwahashi et al.
patent: 4697106 (1987-09-01), Watanabe
patent: 4837460 (1989-06-01), Uchita
patent: 4893275 (1990-01-01), Tanaka et al.
patent: 4902917 (1990-02-01), Simpson
patent: 4910710 (1990-03-01), Kobatake

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