The MC33290 is a serial link bus interface device designed to provide bidirectional halfduplex communication interfacing in automotive diagnostic applications. It is designed to interface between the vehicle's onboard microcontroller and systems offboard the vehicle via the special ISO K line. The MC33290 is designed to meet the "Diagnostic Systems ISO9141" specification. The device's K line bus driver's output is fully protected against bus shorts and over temperature conditions. The MC33290 derives it's robustness to temperature and voltage extremes from being built on a SMARTMOSTM process, incorporating CMOS logic, bipolar/MOS analog circuitry, and DMOS power FETs. Though the MC33290 was principally designed for automotive applications, it is suited for other serial communication applications. It is parametrically specified over an ambient temperature range of 40C TA 125C and 8.0 V VBat 18 V supply. The economical 8 pin DIP and SO8 surface mount plastic packages make the MC33290 very cost effective. Designed to Operate Over Wide Supply Voltage of 8.0 to 18 V