TTL compatible output circuit with a high switching speed

Claim 1

An output circuit compatible with TTL-type circuits, having an output terminal (S) and an input terminal (A1), manufactured without Schottky devices, comprising an intermediate stage (11) and an output stage (12) connected to a supply source, the first terminal (13) of which supplies a voltage higher than the voltage of its second terminal (14), wherein the output stage comprises: a first transistor (Q1), the collector (C1) and base (B1) of which are connected to the first terminal of the supply source through a first resistor (R1) and a second resistor (R2), respectively, a first diode (D1), the anode (9) of which is connected to the emitter (E1) of the first transistor and the cathode (10) is connected to the output terminal, a second transistor (Q2), the collector (C2) of which is connected to the output terminal, the emitter (E2) of which is connected to the second terminal of the supply source and the base (B2) is connected to a third resistor (R3), the free terminal of which is connected to the second terminal of the supply source, a third transistor (Q3), the emitter (E) of which is connected to the base of the second transistor through a fourth resistor (R4), the collector (C3) of which is connected to the first terminal of the supply source and the base is connected to the input terminal, a second diode (D2), the anode (17) of which is connected to the input terminal and the cathode (18) is connected to the emitter of the first transistor, and wherein the intermediate stage is comprised of an inverter which controls the first transistor in phase opposition with respect to the control of the second transistor.