|Supported Protocols||RS232, RS485, RS-422, V.28|
|Supply Voltage (Nom) (V)||3.3, 5|
|232 Tx / Rx||2 / 2|
|485 Tx / Rx||1 / 1|
|RS-232 Max Data Rate (Mbps)||1|
|RS-485/RS-422 Max Data Rate (Mbps)||20|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||8|
|232 Full Handshake|
|Slew Limit Pin||✔|
|Fault Tolerance (V)||-18 to 18|
|Max ICC (mA)||4.5|
|Temperature Range (°C)||-40 to 85|
The SP330E is an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial standards and featuring a variable low voltage logic interface, down to 1.65V. Full operation requires only four external charge pump capacitors.
The RS-485/RS-232 mode pin selects RS-485 mode when high, and RS-232 mode when low. In RS-485 mode the HALF/FULL pin configures the transceiver as either half or full duplex.
The high speed drivers operate up to 20Mbps in RS-485/422 modes, and up to 1Mbps in RS-232 mode. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI) by setting the dedicated SLEW pin low.
All transmitter outputs and receiver inputs feature robust electrostatic discharge (ESD) protection to ±15kV IEC 61000-4-2 Airgap, ±15kV Human Body Model (HBM) and ±8kV IEC 61000-4-2 Contact. Each receiver output has full fail-safe protection to avoid system lockup, oscillation, or indeterminate states by defaulting to logic-high output level when the inputs are open, shorted, or terminated but undriven. No external biasing resistors are required.
The RS-232 receiver inputs include a 5kΩ pull-down to ground when in RS-232 mode. The RS-485/422 receiver inputs are high impedance (>96kΩ), allowing up to 256 devices on a single communication bus (1/8th unit load).
The SP330 operates from a single power supply, either 3.3V or 5V, with low idle current. The shutdown mode consumes less than 1µA in low power standby operation with RS-232 receivers enabled.
- Robust ESD Protection:
- ±15kV IEC 61000-4-2 Air Gap Discharge
- ±8kV IEC 61000-4-2 Contact Discharge
- ±15kV Human Body Model (HBM)
- 20Mbps RS-485 and 1Mbps RS-232 Data Rates
- Pin-Selectable 250kbps Slew Limiting
- Single Supply Operation from +3V to +5.5V
- 1.65V to 5.5V Logic Interface VL pin
- 2 Drivers, 2 Receivers RS-232/V.28
- 1 Driver, 1 Receiver RS-485/422
- Full or Half Duplex Configuration
- 1/8th Unit Load, up to 256 receivers on bus
- RS-485/422 Enhanced Receiver Fail-safe for open, shorted, or terminated but idle inputs
- 10nA Shutdown Supply Current (typical)
- Small 24 TSSOP package
- Software Programmable Serial Ports (RS-232, RS-422, RS-485)
- Industrial and Single Board Computers
- Industrial and Process Control Equipment
- Point-Of-Sale Equipment
- HVAC Controls and Networking Equipment
- Building Security and Automation
Documentation & Design Tools
|Data Sheets||SP330E RS-232/RS-485/RS-422 Transceiver with 1.65V-5.5V Interface||1.0.1||June 2018||1.6 MB|
|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|
|Product Brochures||Interface Brochure||November 2023||3.7 MB|
|Schematics & Design Files||SP330 Evaluation Board Schematics & Design Files||February 2020||942.6 KB|
|Schematics & Design Files||SP330 EVB Schematic||1.0||July 2018||47.7 KB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
|SP330EEY-L||N||Y||Y||Y||Y||L1 / 260ᵒC||TSSOP24|
|SP330EEY-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||TSSOP24|
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||Buy Now||Order Samples|
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.
Find the product page of the part that you want to get an evaluation board for and click on Parts & Purchasing. Example:
Find the icons under Buy Now or Order Samples:
Click on the Buy Now icon and see who has stock and click on the Buy button:
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If the icons are missing, then contact Customer Support.
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.