The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1996
Filed:
Oct. 14, 1994
Vance Risinger, Van Alstyne, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An output driver for use with low voltage level, high speed data transmission busses. An open drain output transistor has a controlled slew rate for a high to low output transition. The slew rate control is provided by controlling the slew rate of the gate voltage of the output transistor in response to an input transition. A slew rate control circuit coupled to the output transistor includes a current source powered by a high stability bias generator, a diode and a capacitance. The current source controls the amount of current available at the gate of the output transistor. The diode and the capacitance combined are used to control the initial voltage at the gate of the output transistor, and the slew rate for the rising voltage waveform at the gate of the output transistor. The resulting circuit has a fast transition time in response to an input transition combined with a tightly controlled slew rate. The output circuit described can meet the proposed specifications for the low voltage level, fast transition busses currently being developed.