Resistor-transistor logic

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Simplified schematic of two input RTL NAND gate.

Resistor-transistor logic (RTL) is a class of digital circuits built from bipolar junction transistors (BJT), and resistors; it is the earliest transistorized digital logic used. Its main limitation was its limited Fan-In, 3 inputs being the limit for many circuit designs, before it completely lost usable noise immunity.

See also

• diode-transistor logic (DTL)
• transistor-transistor logic (TTL)
• emitter coupled logic (ECL)
• Integrated injection logic (I2L)

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