The MC33390 is a serial link bus transceiver designed to provide bi-directional half-duplex communication meeting the automotive SAE Standard J-1850 Class B Data Communication Network Interface specification. It can be used at speeds up to 20 kb/s in non-standard applications.It is designed to interface directly to on-board vehicle microcontrollers and serves to transmit and receive data on a single wire bus at data rates of 10.4 kb/s using variable pulse width modulation. The MC33390 operates directly from a vehicles 12 V battery system and functions in a "true logic" fashion as an I/O interface shifting the micro- controllers 5.0 V CMOS logic level signals to 0 to 7.0 V waveshaped signal swings required of the bus. The bus output driver is short circuit current limited. A tristateable 4X/loop mode select pin is used to invoke normal wave shaped J-1850 Class B operation (0 V), disabled waveshaping high speed operation (5.0 V),or looped-back transmitted Tx output to Rx signal after having been wave shaped but not transmitted onto the bus (high impedance). The loop-back mode is used to confirm operational integrity independent of the bus. Though the MC33390 was principally designed for automotive SAE J-1850 Class B Standards, it is suited for other serial module-to-module communication applications. It is parametrically specified over an ambient temperature range of  – 40°C to 125°C and 7.0 V  to 16 V supply. The economical 8–pin SO–8 surface mount plastic package makes the device a cost effective solution.

MC33390 removed from active portfolio. Possible Replacement Part:  None