U.S. Patent No. 5,448,180 Kvaser CAN Pages, CAN Introduction Transmitter end stage INVENTORS:Kienzler; Rainer, Reutlingen, Federal Republic of Germany; Fleischer; Ulrich, Pliezhausen, Federal Republic of Germany; Elbracht; Berthold, Reutlingen, Federal Republic of Germany ASSIGNEES:Robert Bosch GmbH, Stuttgart, Federal Republic of Germany ISSUED:Sep. 5 , 1995  FILED:Feb. 22, 1992 Abstract A transmitter end stage for a data transmission system comprising at least one control unit and data transmission lines, especially for a CAN bus system having at least one CAN controller and one CAN bus (CB) is proposed, characterized by the fact that the individual circuit elements of transmitter end stage 18 are integrated monolithically. As a result of the special layout and its circuit-design arrangement of the individual elements (3, 5; R1, D1, T1; R2, D2, T2; D10, D20) of the transmitter end stage, the effects of malfunctions, for example of short circuits of the data lines to ground or to the supply voltages, are reduced to a minimum. As a result of the special choice of pre-drivers (3, 5), minimum delay times are achieved, so that signals can be transmitted at a higher data rate. First Claim 1. In a driver associated with a data line of a bus system, a monolithically integrated end-stage circuit comprising: a) a switching transistor, said switching transistor i) electrically coupled between said data line and a supply voltage, ii) controlled by a control signal; b) a resistor, said resistor i) connected in series with said switching transistor, ii) connected to said data line, iii) formed lying in a tub of said monolithically integrated circuit; c) a first diode, said first diode i) including an anode coupled with said supply voltage, ii) including a cathode coupled with said tub of said resistor; and d) a second diode, said second diode connected in series with said switching transistor.