Abstract: A TTL-level BiCMOS driver comprises a oversaturation preventing part for preventing oversaturation in following parts including two diodes connected to each supply voltage, an inverter connected to the diodes and including a PMOS transistor and a NMOS transistor of which drain is connected to an input terminal; an inverter part connected to the oversaturation preventing part including a transistor and a diode connected to the emitter of the transistor and a resistor connected to the drain thereof and an inverter; and a switching part including first and second switching parts, the first switching part having an inverter connected to the input terminal, a PMOS transistor connected to the inverter, darlington transistors and a NMOS transistor connected to the base of one of the switching part having a transistor turned on according to the driving of the transistor in the inverter part and a NMOS transistor connected to the input terminal and a base of the transistor in the second switching part.

Abstract: A full-swing BiCMOS driver comprising an inverter for inverting an input signal, which includes two pairs of NMOS and PMOS transistors to invert an input signal and to prevent current leakage, a full-down controlling part for providing control signals, an output driving part for providing an output, and a delay-inverter for delaying and inverting the input signal which includes a delay part having two transmission gates to serve as resistors. According to the present invention, a full-swing BiCMOS driver which provides a full-swing logic value and prevents any additional power consumption by means of the delaying inverter.