Three State Push Pull Driver
Original Publication Date: 1980-Oct-01
Included in the Prior Art Database: 2005-Feb-13
The three-state push-pull driver shown in Fig. 1 is capable of driving 180 picofarads within 10 nanoseconds. Transistor T2 provides the phase-splitting function to T7 and to the Darlington combination of T5 and T6. Transistor diodes T3 and T4 clamp the Up level to restrict the voltage swing. Note that a diode is formed from transistor T3 by connecting its collector and emitter (as opposed to the conventional method of base and collector) in order to eliminate any collector-to-isolation breakdown problems with the device.