Patent ID: 7388404
Filing Date: 2008-06-17
Classification: H03K,H04L

Abstract:
1. A driver circuit comprising: an output driver connected to an output node, the output driver having a first output transistor that sources current to the output node when turned on, and a second output transistor that sinks current from the output node when turned on; a trip point circuit having an input connected to the output node, and an output, the trip point circuit having a trip point voltage; a first control circuit having a first input connected to receive a data signal, a second input connected to the trip point circuit, and an output connected to the first output transistor; and a second control circuit having a first input, a second input connected to the trip point circuit, and an output connected to the second output transistor, when the data signal changes from a first logic state to a second logic state while a voltage on the output node lies below the trip point voltage, the first control circuit sinks a first current with a first positive magnitude from the first output transistor to pull up the voltage on the output node, and with a second positive magnitude after the voltage on the output node rises above the trip point voltage, the second positive magnitude being less than the first positive magnitude.