Integrated circuit device for RS-232C line receiver

Details Integrated circuit device for RS-232C line receiver Integrated circuit device for RS-232C line receiver

1991-03-25

1994-07-05

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 36, 307355, H04L 2506

Patent

active

053274636

ABSTRACT:
An RS-232C line receiver IC includes a reference voltage generating circuit, a switching circuit, a switch control circuit and a hysteresis output circuit. The reference voltage generating circuit produces a first low reference voltage at a node and a second low reference voltage at a node. The switching circuit has a first and a second switching device connected respectively to the nodes of the reference voltage generating circuit. The switch control circuit selectively makes conductive the first or the second switching device. The hysteresis output circuit to which an input is applied is connected to the first and second switching devices and receives the first or second low reference voltage applied through the first or the second switching device as low input threshold voltages. Selection can be made either for threshold characteristics with a high noise margin and a low error rate for transmitting a high speed clock signal, or for threshold characteristics, which can determine the receiver output state when the input is disconnected and can prevent malfunction of the system, for transmitting a control signal.

REFERENCES:
patent: 3725673 (1973-04-01), Frederiksen et al.
patent: 4516247 (1985-05-01), Carsalade et al.
patent: 4634897 (1987-01-01), Yoshioka

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