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Resistor Transistor Logic With Active Turnon

IP.com Disclosure Number: IPCOM000075944D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cabiedes, A: AUTHOR [+2]

Abstract

The circuit is basically of the saturating logic type, which is capable of accepting current in one state and has active drive when in the other state.

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Resistor Transistor Logic With Active Turnon

The circuit is basically of the saturating logic type, which is capable of accepting current in one state and has active drive when in the other state.

The input to the circuit is a variable-current source; however, it can also be driven from a voltage source. When the input current is I (logic "0") the voltage V' approx. VCC - IR 1 biases transistors T1 and T2 to the cutoff region. Transistor T3 is then turned on and provides the active "on" drive necessary to charge a large load capacitance.

When the input current is zero (logic "1") transistors T1 and T2 are biased to the saturation region. Transistor T1 keeps transistor T3 in cutoff and transistor T2 is able to accept the load current.

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