Transmitter circuitry with N-type pull-up transistor and low output voltage swing

An apparatus comprising:

• a first transistor coupled between a first supply node and an output node, wherein the first transistor is an N-type transistor;
• a resistive device and a second transistor coupled in series between the output node and a second supply node;
• a third transistor coupled between the first supply node and the output node, wherein the third transistor is a P-type transistor;
• a multiplexer to receive a first power supply and a second power supply, and output the first power supply to the first supply node in a first mode of operation and output the second power supply to the first supply node in a second mode of operation, wherein a first voltage level of the first power supply is lower than a second voltage level of the second power supply;
• and
• a pre-driver circuitry to receive data, and to output a first control signal to control the first transistor, a second control signal to control the second transistor, and a third control signal to control the third transistor,
• wherein, in the first mode of operation, the pre-driver circuitry is to turn-off the third transistor and is to use the first transistor to selectively pull-up the output node based on the data;
• wherein, in the second mode of operation, the pre-driver circuitry is to turn-off the first transistor and is to use the third transistor to selectively pull-up the output node based on the data;
• wherein the pre-driver circuitry includes a level shifter;
• and
• wherein the level shifter, in the second mode of operation, changes a voltage level of the third control signal from a voltage level at which the pre-driver circuitry operates to a voltage level at which the gate of the third transistor operates.