Bidirectional input/output cells

摘要

A bi-directional input/output (IO) cell for transmitting and receiving data signals simultaneously over a single line. The bidirectional IO cell having an IO node adapted to connect to the line. A driver has an output connected to the line and an input for receiving a core output signal. A first differential amplifier has a first input connected to the IO node and a second input connected to a high voltage reference circuit. A second differential amplifier has a first input connected to the IO node and a second input connected to a low voltage reference circuit.