Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1976-04-21
1977-09-13
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307360, 307251, 307279, 307290, 328150, H03K 5153, H03K 3295, H03K 3353, H03K 1730
Patent
active
040485242
ABSTRACT:
In a MOS integrated circuit, a voltage level detecting and indicating circuit apparatus is provided. In the apparatus there is provided a MOS integrated circuit means responsive to a change in the magnitude of a voltage in the circuit. In the circuit means there is provided a first node at which occurs a first signal when the magnitude of the voltage is changed to a first predetermined magnitude, said occurrence of said first signal being independent of at least one of a plurality of process variables including threshold voltage, mobility, body effect factor and lateral diffusion within a predetermined range of magnitude of said variable, and a second node at which occurs a second signal when said magnitude of said voltage is changed to a second predetermined magnitude and a third signal when said magnitude of said voltage is changed to the third predetermined magnitude, said occurrence of said second and third signals being dependent on at least one of said plurality of process variables.
REFERENCES:
patent: 3609411 (1971-09-01), Ma et al.
patent: 3612908 (1971-10-01), Heimbigner
patent: 3697777 (1972-10-01), Donoghue
patent: 3851189 (1974-11-01), Moyer
patent: 3984703 (1976-10-01), Jorgensen
Laugesen Ronald C.
Shieu Mark Shin-Dong
Anagnos Larry N.
Heyman John S.
Higgins Willis E.
National Semiconductor Corporation
Woodward Gail W.
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