The MC33290 is a serial link bus interface device designed to provide bi–directional half–duplex communication interfacing in automotive diagnostic applications. It is designed to interface between the vehicle’s on–board microcontroller and systems off–board 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.

• Designed to Operate Over Wide Supply Voltage of 8.0 to 18 V
• Ambient Operating Temperature of –40°C to 125°C
• Interfaces Directly to Standard CMOS Microprocessors
• ISO K Line Pin Protected Against Shorts to Ground
• Thermal Shutdown with Hysteresis
• Maximum Transmission Speeds in Excess of 50 k Baud
• ISO K Line Pin Capable of High Currents
• ISO K Line can be Driven with up to 10 nF of Parasitic Capacitance
• 8.0 kV ESD Protection Attainable with Few Additional Components
• Standby Mode: No VBat Current Drain with VDD at 5.0 V
• Low Current Drain during Operation with VDD at 5.0 V