Patent ID: 6686765
Filing Date: 2004-02-03
Classification: H03K

Abstract:
An integrated circuit driver comprising:an output node for coupling to a load and providing a first voltage level at a predetermined impedance, the first voltage level corresponding to a logic high level, and providing a second voltage level at the predetermined impedance, the second voltage level corresponding to a logic low level, and presenting a high impedance state; a first switched resistive element coupled to the output node and also coupled to a first voltage source; a second switched resistive element coupled to the output node and also coupled to a ground potential; a third switched resistive element coupled to the output node and also coupled to the ground potential; a first control line coupled to the first switched resistive element, the first control line for actuating the first switched resistive element; a second control line coupled to the second switched resistive element, the second control line for actuating the second switched resistive element; a third control line coupled to the third switched resistive element, the third control line for actuating the third switched resistive element; and a predriver having a first node coupled to the first control line and a second node coupled to the second control line, the predriver adapted to provide a predetermined edge rate; and wherein the load is a resistive load coupled to a third voltage source and wherein the first voltage level, the second voltage level and the predetermined impedance remain substantially constant with variations in manufacturing process, variations in the first voltage source and variations in operating temperature.