Logic circuit with the function of controlling discharge current

Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Bipolar transistor

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326 18, 326 75, H03K 1920

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active

055721524

ABSTRACT:
A first current switch circuit 1a outputs a first logic signal and a complementary signal thereof in response to an input logic signal. A pull-up transistor Q10 has a base receiving the first logic signal. A second current switch circuit 1b outputs a second logic signal based on the complementary signal and the potential of an output terminal OUT1. A level shift circuit 1c shifts the level of the second logic signal and provides it to the base of a pull-down transistor Q11. When the potential of an input terminal IN1 changes from a low level to a high level, a capacitive load CL is discharged through transistors Q9 and Q11. When the potential of output terminal OUT1 becomes lower than that of a first reference potential terminal VBB1, the second logic signal attains a low level, thereby turning off pull-down transistor Q11.

REFERENCES:
patent: 4628216 (1986-12-01), Mazumder
patent: 4700087 (1987-10-01), Stroberger
patent: 4877977 (1989-10-01), Kokado
patent: 4970417 (1990-11-01), Kubota
patent: 5287019 (1994-02-01), Nonaka
"High-Speed Dugutak Circuits", Kai-Yap TOH et al., 1989 IEEE International Solid-State Circuits Conference, pp. 224-225.

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