A high speed, non-inverting circuit for providing an interface between TTL logic gates and Schottky transistor logic gates

Claim 1

A circuit for translating a first logic voltage to a second logic voltage for operative connection to a source of potential, comprising: a first high barrier Schottky diode having a cathode to serve as the circuit input, an emitter-follower transistor circuit having an input coupled to the anode of said input Schottky diode, a second high barrier Schottky diode having an anode coupled to the input of said emitter-follower transistor circuit, and a plurality of series-connected diodes, the first of said series-connected diodes having an anode coupled to the cathode of said high barrier Schottky diode and the last of said series-connected diodes having a cathode coupled to ground wherein said input of said emitter-follower transistor circuit is clamped to a voltage level substantially equal to the difference between said first logic voltage and the voltage across said first Schottky diode by said series-connected diodes and said second Schottky diode; a low barrier Schottky diode coupled to receive an output from said emitter follower transistor to serve as an output for the circuit; and a constant current source coupled to said low barrier Schottky to sink the current therethrough.