|Information||20Mbps Half-Duplex RS-485 Transceivers with +/-15KV ESD|
|Supported Protocols||RS-422, RS-485|
|Supply Voltage (Nom) (V)||5|
|No. of Tx||1|
|No. of Rx||1|
|Data Rate (MAX) (Mbps)||20|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||-|
|Transient Tolerance (V)|
|Fault Tolerance (V)|
|Temperature Range (°C)||0 to 70, -40 to 85|
|ICC (Max) (mA)||-|
|Typ Shutdown Current (µA)||10|
|PROFIBUS (5V) or High Output (3V)|
The SP1481E and the SP1485E are a family of half-duplex transceivers that meet the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over +15KV for both Human Body Model and IEC1000-4-2 Air Discharge Method. These devices are pin-to-pin compatible with MaxLinear's SP481 and SP485 devices as well as popular industry standards. As with the original versions, the SP1481E and the SP1485E feature MaxLinear's BiCMOS design allowing low power operation without sacrificing performance. The SP1481E and SP1485E meet the requirements of the RS-485 and RS-422 protocols up to 20Mbps under load. The SP1481E is equipped with a low power Shutdown mode.
- +5V Only
- Low Power BiCMOS
- Driver/Receiver Enable for Multi-Drop configurations
- Enhanced ESD Specifications:
- +15KV Human Body Model
- +15KV IEC1000-4-2 Air Discharge
Documentation & Design Tools
|Data Sheets||SP1481E/SP1485E Enhanced Low Power Half-Duplex RS-485 Transceivers||1.0.3||May 2013||464.2 KB|
|Application Notes||RS-232 and RS-485 PCB Layout Application Note||R00||December 2022||2.8 MB|
|Application Notes||AN-292, RS-485 Cable Lengths vs Data Signaling Rate||R01||July 2022||2.7 MB|
|Application Notes||ANI-12, RS-485 Isolated Interface||Rev B||September 2017||89.5 KB|
|Application Notes||ANI-13, RS-485 and RS-422 Physical Topologies||D||December 2006||183.2 KB|
|Design Solutions||DS-18, Extend Reach Of 250kbps to 1Mbps Full Duplex RS-232 Serial Bus By Converting To RS-485||November 2007||50.6 KB|
|Product Brochures||Interface Brochure||November 2023||3.7 MB|
Parts & Purchasing
|Part Number||Pkg Code||Min Temp||Max Temp||Status||Suggested Replacement||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)
Fail Safe is an attempt to keep the output of the RS-485 receiver to a known state. Transceivers may have standard fail safe or advanced / enhanced receiver fail safe features. Standard fail safe supports open inputs while enhanced fail safe transceivers such as the SP339 and XR34350 support open input, shorted input and undriven terminated lines without external biasing. See Application Note ANI-22 for more detail.
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.