Overview
Information | 3.3V Low Power Full Duplex RS-485 Transceivers with 10Mbps Data Rate |
---|---|
Supported Protocols | RS-422, RS-485 |
Supply Voltage (Nom) (V) | 3.3 |
No. of Tx | 1 |
No. of Rx | 1 |
Duplex | Full |
Data Rate (MAX) (Mbps) | 10 |
HBM ESD (kV) | 2 |
IEC 61000-4-2 Contact (±kV) | - |
Rx Fail-Safe | Standard |
Multi-Drop Nodes | 32 |
Transient Tolerance (V) | |
Fault Tolerance (V) | |
VL Pin | |
Temperature Range (°C) | 0 to 70, -40 to 85 |
Package | NSOIC-14 |
ICC (Max) (mA) | 2 |
Shutdown | |
Typ Shutdown Current (µA) | 10 |
Hot Swap | |
PROFIBUS (5V) or High Output (3V) |
The SP3490 and SP3491 devices are +3.3V low power full-duplex
transceivers that meet the specifications of the RS-485 and RS-422
serial protocols. These devices are pin-to-pin compatible with the MaxLinear SP490 and SP491 devices as well as popular industry standards. The
SP3490 and SP3491 feature MaxLinear's BiCMOS process, allowing low power
operation without sacrificing performance. The SP3490 and SP3491 meet
the electrical specifications of the RS-485 and RS-422 serial protocols
up to 10Mbps under load. The SP3491 is identical to the SP3490 with the
addition of driver and receiver tri-state enable lines.
- Full Duplex RS-485 and RS-422 Transceivers
- Operates from a single +3.3V supply
- Interoperable with +5.0V logic
- Driver/Receiver Tri-state Enable Lines
- -7V to +12V Common-Mode Input Voltage Range
- +200mV Receiver Input Sensitivity
- Allows up to 32 transceivers on the serial bus
- Compatibility with LTC491 and SN75180
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | SP3490/SP3491 +3.3V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate | 1.0.3 | September 2017 | 481.9 KB |
Application Notes | AN-291, RS-485 Advanced Fail-Safe Feature | R01 | May 2023 | 3.7 MB |
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-13, RS-485 and RS-422 Physical Topologies | D | December 2006 | 183.2 KB |
Product Brochures | Interface Brochure | R01 | June 2024 | 3.6 MB |
Product FAQs | SP3491 FAQ | 1.0.0 | October 2006 | 179.8 KB |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
SP3491CN-L | N | Y | Y | Y | Y | L2 / 260ᵒC | NSOIC14 |
SP3491CN-L/TR | N | Y | Y | Y | Y | L2 / 260ᵒC | NSOIC14 |
SP3491EN-L | N | Y | Y | Y | Y | L2 / 260ᵒC | NSOIC14 |
SP3491EN-L/TR | N | Y | Y | Y | Y | L2 / 260ᵒC | NSOIC14 |
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 |
---|---|---|---|---|---|---|---|---|
SP3491CN | NSOIC14 | 0 | 70 | OBS | SP3491CN-L | |||
SP3491CN-L | NSOIC14 | 0 | 70 | Active | Click Buy Now | Order | ||
SP3491CN-L/TR | NSOIC14 | 0 | 70 | Active | Click Buy Now | Order | ||
SP3491CN/TR | NSOIC14 | 0 | 70 | OBS | SP3491CN-L/TR | |||
SP3491EN | NSOIC14 | -40 | 85 | OBS | SP3491EN-L | |||
SP3491EN-L | NSOIC14 | -40 | 85 | Active | Click Buy Now | Order | ||
SP3491EN-L/TR | NSOIC14 | -40 | 85 | Active | Click Buy Now | Order |
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.
Packaging
Pkg Code | Details | Quantities | Dimensions |
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NSOIC14 |
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Notifications
Distribution Date | Description | File |
---|---|---|
07/17/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM A: Fixed MBB label logo for DX204001 to MaxLinear logo. ADDENDUM B: Replaced ‘All other affected products outer box label’ with clearer pictures. Corrected Date Issued (from original PCN) issue date +90 days to August 30, 2023. | PCN & PDN Download |
06/01/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. | PCN & PDN Download |
06/01/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM: Fixed MBB label logo for DX204001 to MaxLinear logo. | PCN & PDN Download |
12/19/2016 | Qualification of alternate assembly subcon, ANST, China. | PCN & PDN Download |
08/12/2016 | Addition of an alternate qualified location, JCET, for assembly using copper wire bonding. | PCN & PDN Download |
02/11/2016 | Foundry line qualification, Addition of qualified 6 inch wafer processing line in Silan | PCN & PDN Download |
09/11/2015 | Alternate assembly site Addition of an alternate assembly supplier Greatek in Taiwan. | PCN & PDN Download |
10/03/2013 | Qualification of SiO2 5KÅ + SiN 7KÅ passivation to replace PSG 10KÅ passivation. Material & Process Changes. | PCN & PDN Download |
07/02/2013 | Addition of an alternate qualified assembly supplier, Carsem (Malaysia) for 14 and 16 lead NSOIC package using copper wire bonding. Material change. | PCN & PDN Download |
02/02/2012 | Design Change: Poly layer changed to optimize the receiver gate length. To improve device performance and production consistency. | PCN & PDN Download |
07/30/2010 | Process Change. Capacity enhancement. | PCN & PDN Download |
12/07/2009 | Enhancement of NSOIC 8, NSOIC14 and NSOIC16 packages to Green (halogen-free) via Mold Compound & Die Attach Material. Enhance packages to be Green (halogen-free). | PCN & PDN Download |
05/19/2009 | Notice of Obsolescence Discontinued by Exar Corporation due to low market demand | PCN & PDN Download |
11/26/2008 | Notice of Obsolescence Package Discontinuation Notice | PCN & PDN Download |
02/28/2007 | Product Obsolescence Letter and Discontinuation Notification. Discontinued. | PCN & PDN Download |
02/02/2006 | Announcing transfer of certain Power Management and Interface Products from Hillview fabrication facility to wafer foundary Episil. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site | PCN & PDN Download |
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) |
19200 | 50 |
9600 | 500 |
4800 | 1000 |
2400 | 3000 |
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.