Integrated circuit arrangement with an open-collector transistor

Details Integrated circuit arrangement with an open-collector transistor Integrated circuit arrangement with an open-collector transistor

1997-05-07

1999-10-26

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 15, 326 90, 327382, H03K 190175, H03K 19082, H03K 19003

Patent

active

059735139

ABSTRACT:
In an integrated circuit arrangement with an open-collector transistor of the npn type, the collector of the open-collector transistor is connected through a collector resistor with preferably low ohmic resistance to an open-collector output of the circuit arrangement to which an output voltage is applied, and, through a parasitic diode which is switched in the reverse direction when the output voltage has a positive value, to a ground terminal of the circuit arrangement. The emitter of the open-collector transistor is connected to the ground terminal of the circuit arrangement and the base of the open-collector transistor is connected to a base current source that generates a base current. The open-collector transistor is switched to an inverse conducting state by the base current when the voltage value of the output voltage is below a negative threshold voltage value, in which state a voltage drop occurs across the collector resistor that is so great that the parasitic diode remains switched in the reverse direction.

REFERENCES:
patent: 4564769 (1986-01-01), Melamed
patent: 4721869 (1988-01-01), Okado
patent: 4965466 (1990-10-01), Pigott
J. Millman et al.: "Microelectronics". McGraw-Hill, New York, 1988, p. 180.
"Kurzschlussfester `Open-Collector`--Ausgang mit niedriger Sattigungsspannung" by R. Glitsch. Elektronik Bd. 34, Nr. 22, 1985.
U. Tietze et al.: "Halbleiter-Schaltungtechnik" [Semiconductor Circuit Technology]. Springer-Verlag, Berlin, 1978, p. 161.

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