Motorola 33990 Serial Link J-1850 Bus Transceiver MC33990 Fact Sheet
Summary
Drive robust, reliable data communication for demanding embedded systems with this J-1850 bus transceiver module. Engineered specifically for Automotive and Industrial applications, it seamlessly interfaces low-voltage 5V CMOS microcontrollers with high-level communication buses while conforming to SAE J-1850 Class B standards. The manual details advanced features including controlled waveform shaping to reduce EMI, enhanced auto-protection circuits (e.g., over current/temp), and diagnostic loopback modes, making it essential for engineers needing dependable signal integrity across extreme temperature variations.
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ANALOG PRODUCTS
MC33990 FACT SHEET
33990 SERIAL LINK J-1850 BUS TRANSCEIVER
The 33990 provides bi-directional half-duplex communication meeting the automo- tive SAE Standard J-1850 Class B Data Communication Network Interface specifi- cation. It interfaces directly to microcontrollers, serves to transmit and receive sin-
APPLICATIONS
gle-wire bus data at 10.4 k B/s using variable pulse width modulation, operates from
Farm Equipment
vehicle’s 12 V battery or board level DC power source, and shifts microcontroller’s
Industrial Equipment
5.0 V CMOS logic level signals to 0 to 7.0 V reduced radiated EMI waveshaped sig-
Robotic Systems
nals. A tristateable 4X/Loop pin invokes Normal or Disabled Waveshaping, or
Automotive Systems Looped-Back Tx output to Rx signal after being waveshaped but not transmitted Applications where over the bus to check bus integrity. Module-to-Module
The 33990 is designed to
Communication is
enhance robustness to a Simplified Application Diagram
Required
double fault condition.
Marine and Aircraft Primary
(Loss and reconnection of VBATT
Networks
module battery while
+VBAT BUS
module ground is lost.)
SLEEP
Secondary
Nodes
4X/Loop GND CO IC AT IO LI , I SO -9 1, -1
Performance Typical Values
CUSTOMER BENEFITS
Bus Output J-1850 VPWM
Lower system cost with reduced part count with Data Rate to 20 k B/s simple external hook up
Operating Voltage 9.0 – 16 V
Industry standard communication protocol Sleep/Stdby Current 20 µA Smaller system (reduced component count) ESD ± 2000 V
Faster design cycle time Operating Temp -40°C ≤ TA 125°C
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Page Summary Contents For Motorola 33990 Serial Link J-1850 Bus Transceiver MC33990 Fact Sheet
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 4 |
| File Size | 181.34 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What communication protocols does the MC33990 support?
It supports J-1850, LIN, ISO-9141, and is used for half-duplex bi-directional communication.
How does the device interface with microcontrollers?
It interfaces directly to standard 5.0 V CMOS microcontroller logic level signals.
What are the operating voltage ranges and temperature resilience?
The operating voltage is 9.0 – 16 V, and it operates in a temperature range of -40°C to 125°C.
Can I check for bus integrity using this module?
Yes, the tristateable 4X/Loop pin allows Looped-Back Tx output for checking bus integrity.