Bus driver circuit with overvoltage protection

Details Bus driver circuit with overvoltage protection Bus driver circuit with overvoltage protection

1995-06-07

1997-06-24

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 81, 326 84, H03K 190175, H03K 190948, H03K 19082

Patent

active

056420595

ABSTRACT:
A bus driver circuit having a driver input (16) for the reception of a data signal and a driver output (20) for the application of the output voltage of a voltage source (Vcc) to a bus core (10) in a manner dependent on the presence of a data signal at the driver input (16). It possesses a first controllable switch (A) placed between the voltage source (Vcc) and the driver output (20) and a control circuit loop (B), which on the application of the data signal to the driver input (16) is able to be placed in an active state by its producing a drive signal putting the controllable switch (A) in a conducting state. A second controllable switch (C) is between the control circuit loop (B) and the driver input (16). A comparator (D) compares the voltage at the driver output (20) with a reference voltage (V.sub.ref) and when the voltage at the driver output (20) exceeds the output voltage (Vcc) of the source, provides a control signal which turns off the second controllable switch (C) and puts the control switch loop (B) in the inactive state by turning off the first controllable switch (A).

REFERENCES:
patent: 4581551 (1986-04-01), Campbell, Jr.
patent: 5004936 (1991-04-01), Andresen
patent: 5019720 (1991-05-01), Skoog et al.
patent: 5053643 (1991-10-01), Tanaka et al.
patent: 5153464 (1992-10-01), Joly
patent: 5184034 (1993-02-01), Ohannes et al.
patent: 5406140 (1995-04-01), Wert et al.
patent: 5432462 (1995-07-01), Obregon et al.

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