Tri-state output circuit

Abstract

Abstract PURPOSE:To make the switching speed high, by holding the base voltage of the transistor, which controls the output-stage transistor, constant when the tri-state output is changed from a high impedance to a high level. CONSTITUTION:The fourth transistor Q6 where turning-on and off are controlled by the input signal has the emitter earthed and the collector connected to power source VCC through diode D6 where the cathode side is connected, the base of the third transistor Q7, and resistance R4. The gata for tri-state control is connected to the base of the third transistor Q7 through diode D3, and turning-on and off of the first transistor Q11, which has the emitter connected to the output terminal and the collector the connected to the power source side, and the second transistor, which has the emitter earthed and collector connected to the output terminal, are controlled by this transistor Q9.

Inventors

• 👤 Kazuyasu Ejiri

Bibliographic Details