|Information||Programmable RS-232/RS-485 Transceiver|
|Supported Protocols||RS232, V.28, RS485, RS422, V.24|
|Supply Voltage (Nom) (V)||5|
|No. of Tx|
|No. of Rx|
|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|
|232 Tx / Rx||4 / 4|
|485 Tx / Rx||2 / 2|
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||DAN-190, MaxLinear UARTs in RS-485 Applications||2||December 2022||2.3 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 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|
|Product Brochures||Interface Brochure||October 2022||3.8 MB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
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
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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.