Modified transistor-transistor logic circuit

Details Modified transistor-transistor logic circuit Modified transistor-transistor logic circuit

H - Electricity

03

K

328/143

H03K 19/08 (2006.01) H03K 19/013 (2006.01)

Patent

CA 1048615

MODIFIED TRANSISTOR-TRANSISTOR LOGIC CIRCUIT Abstract An improved modified transistor-transistor logic (T2L) circuit having operating voltages compatible with existing T2L logic blocks which includes a coupling transistor having its base connected to a current source and being selectively responsive to switch current either between its respective base emitter terminals or base collector terminals, and an output transistor having its base connected to the collector of the coupling transistor for generating an output signal at its collector terminal, and an on diode con- nected to the emitter of the output transistor for providing a current path constituted by the base-to-collector terminals of the coupling transistor, the base-to-emitter terminals of the output transistor, and the on diode. The modified T2L circuit is also compatible with a lower power supply voltage source.

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