Direct-coupled transistor logic

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A special type of resistor–transistor logic (RTL), a direct-coupled transistor logic or DCTL gate is one wherein the bases of the transistors are connected directly to inputs without any base resistors. Without the base resistors, DCTL gates are more economical and simpler to fabricate onto integrated circuits than RTL gates with base resistors. Unfortunately, DCTL has a high susceptibility to ground noise and requires consistent transistor characteristics.the voltage level of Vbe circuit is 0.8v for level 1. and for Vce is 0.2v for level 0.^[1]

References

^ Roehr (1963, p. 36)

Roehr, William, ed. (1963), Switching Transistor Handbook, Motorola, Inc.

External links

www.antiquetech.com

v t e Logic families
MOS technology	PMOS logic NMOS logic Depletion-load NMOS logic (including HMOS) Complementary MOS (CMOS) Pass transistor logic (PTL) Bipolar–CMOS (BiCMOS)
Other technologies	Diode logic Diode–transistor logic (DTL) Open collector (OC) Direct-coupled transistor logic (DCTL) Emitter-coupled logic (ECL) Gunning transceiver logic (GTL) Integrated injection logic (I²L) Resistor–transistor logic (RTL) Transistor–transistor logic (TTL) Current mode logic / Source-coupled logic (CML/SCL)
Types	Static Dynamic Domino logic Four-phase logic

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