Variable drive strength hysteresis input circuitry

Details Variable drive strength hysteresis input circuitry Variable drive strength hysteresis input circuitry

2006-05-09

2006-05-09

Tan, Vibol (Department: 2819)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

C327S205000

Reexamination Certificate

active

07042264

ABSTRACT:
A variable drive strength hysteresis input circuit is disclosed that comprises pull-up circuitry and pull-down circuitry. A variable drive strength circuit changes the pull-up drive strength and the pull-down drive strength in response to receiving an input voltage signal that transitions either from a low level to a high level or from a high level to a low level. In one advantageous embodiment the variable drive strength hysteresis input circuit comprises four p-channel MOSFET transistors and four n-channel MOSFET transistors. The invention efficiently reduces transition noise in the inputs to an integrated circuit chip.

REFERENCES:
patent: 5767728 (1998-06-01), Michail et al.
patent: 6046617 (2000-04-01), Hoeld
patent: 6388488 (2002-05-01), Ho
patent: 2005/0093602 (2005-05-01), Hinterscher

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