|Information||Programmable RS-232/RS-485 Transceiver|
|Supported Protocols||RS232, V.28, RS485, RS422, V.24|
|Supply Voltage (Nom) (V)||5|
|232 Tx / Rx||4 / 4|
|485 Tx / Rx||2 / 2|
|RS-232 Max Data Rate (Mbps)||0.12|
|RS-485/RS-422 Max Data Rate (Mbps)||10|
|HBM ESD (kV)||2|
|IEC 61000-4-2 Contact (±kV)||-|
|232 Full Handshake|
|Slew Limit Pin|
|Fault Tolerance (V)|
|Max ICC (mA)||30|
|Temperature Range (°C)||0 to 70, -40 to 85|
The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. The SP331 contains four drivers and four receivers when selected in RS-232 mode; and two drivers and two receivers when selected in RS-485 mode. The SP331 also contains a dual mode which has two RS-232 drivers/receivers plus one differential RS-485 driver/receiver.
The RS-232 transceivers can typically operate at 230kbps while adhering to the RS-232 specifications. The RS-485 transceivers can operate up to 10Mbps while adhering to the RS-485 specifications. The SP331 includes a self-test loopback mode where the driver outputs are internally configured to the receiver inputs. This allows for easy diagnostic serial port testing without using an external loopback plug. The RS-232 and RS-485 drivers can be disabled (High-Z output) by controlling a set of four select pins.
- +5V Only Operation
- Software Programmable RS-232 or RS-485 Selection
- Four RS-232 Transceivers iRS-232 Mode
- Two RS-485 Full-Duplex Transceivers in RS-485 Mode
- Two RS-232 Transceivers and One RS-485 Transceiver in Dual Mode
- Self-Testing Loopback Mode
- Full Driver Tri-State (Hi-Z) Control
- Ideal for RS-232 to RS-485 conversion
Documentation & Design Tools
|Data Sheets||SP331 Programmable Dual RS-232/RS-485 Transceiver||1.0.1||March 2018||561.5 KB|
|Application Notes||Advantages of Designing with Multi-Protocol Transceivers Application Note||R00||September 2023||2.5 MB|
|Application Notes||DAN-190, MaxLinear UARTs in RS-485 Applications||R01||July 2023||2.4 MB|
|Application Notes||RS-232 and RS-485 PCB Layout Application Note||R00||December 2022||2.8 MB|
|Application Notes||ANI-16, Design Guide for Multi-Protocol Serial Ports||A||November 2005||462.9 KB|
|User Guides & Manuals||XR21B1420 Evaluation Board User’s Manual||1B||January 2020||1.2 MB|
|Product Brochures||Interface Brochure||November 2023||3.7 MB|
|Product FAQs||SP331 FAQ||1.0.0||June 2006||190.7 KB|
|Schematics & Design Files||XR21B1420/1421 Evaluation Board Design Files||REV 10||June 2016||386.5 KB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
|SP331CT-L||N||Y||Y||Y||Y||L3 / 260ᵒC||WSOIC28|
|SP331CT-L/TR||N||Y||Y||Y||Y||L3 / 260ᵒC||WSOIC28|
|SP331ET-L||N||Y||Y||Y||Y||L3 / 260ᵒC||WSOIC28|
|SP331ET-L/TR||N||Y||Y||Y||Y||L3 / 260ᵒC||WSOIC28|
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
|Part Number||Pkg Code||Min Temp||Max Temp||Status||Suggested Replacement||Buy Now||Order Samples||PDN|
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
FAQs & Support
Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.
Submit a Technical Support Question As a New Question
For RS-232 it is 50 feet (15 meters), or the cable length equal to a capacitance of 2500 pF, at a maximum transmission rate of 19.2kbps. When we reduce the baud rate, it allows for longer cable length. For Example:
Baud Rate (bps)
Maximum RS-232 Cable Length (ft)
The Parts & Purchasing section of the product page shows the Status of all orderable part numbers for that product. Click Show obsolete parts, to see all EOL or OBS products.
How to Design a Multiprotocol System using Only 1 Connector
Industrial networks support multiple serial interfaces such as RS-485 and RS-232. Using a multiprotocol transceiver enables industrial equipment to support both protocols using only one connector. Enabling both smaller and lower cost equipment designs. This video describes how to design multiprotocol systems using only one connector.