Overview
Information | Full Duplex RS-485 Transceivers |
---|---|
Supported Protocols | RS-422, RS-485 |
Supply Voltage (Nom) (V) | 5 |
No. of Tx | 1 |
No. of Rx | 1 |
Duplex | Full |
Data Rate (MAX) (Mbps) | 5 |
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) | - |
Shutdown | ✔ |
Typ Shutdown Current (µA) | |
Hot Swap | |
PROFIBUS (5V) or High Output (3V) |
The SP490 is a low power differential line driver/receiver meeting
RS-485 and RS-422 standards up to 5Mbps. The SP491 is identical to the
SP490 with the addition of driver and receiver tri-state enable lines.
Both products feature ±200mV receiver input sensitivity, over wide
common mode range. The SP490 is available in 8-pin plastic DIP and 8-pin
NSOIC packages for operation over the commercial and industrial
temperature ranges. The SP491 is available in 14-pin DIP and 14-pin
NSOIC packages for operation over the commercial and industrial
temperature ranges.
- +5V Only
- Low Power BiCMOS
- Driver/Receiver Enable (SP491)
- RS-485 and RS-422 Drivers/Receivers
- Pin Compatible with LTC491 and SN75180
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | SP490_SP491 Full Duplex RS-485 Transceivers | 1.0.2 | February 2018 | 647.6 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 |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
SP491CN-L/TR | N | Y | Y | Y | Y | L2 / 260ᵒC | NSOIC14 |
SP491EN-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 |
---|---|---|---|---|---|---|---|---|
SP491CN | NSOIC14 | 0 | 70 | OBS | ||||
SP491CN-L | NSOIC14 | 0 | 70 | OBS | SP491CN-L/TR | |||
SP491CN-L/TR | NSOIC14 | 0 | 70 | Active | Click Buy Now | Order | ||
SP491CN/TR | NSOIC14 | 0 | 70 | OBS | ||||
SP491CS | PDIP14 | 0 | 70 | OBS | ||||
SP491CS-L | PDIP14 | 0 | 70 | OBS | SP491ECP-L | |||
SP491EN | NSOIC14 | -40 | 85 | OBS | ||||
SP491EN-L | NSOIC14 | -40 | 85 | OBS | SP491EN-L/TR | |||
SP491EN-L/TR | NSOIC14 | -40 | 85 | Active | Click Buy Now | Order | ||
SP491EN/TR | NSOIC14 | -40 | 85 | OBS | ||||
SP491ES | PDIP14 | -40 | 85 | OBS | ||||
SP491ES-L | PDIP14 | -40 | 85 | OBS | SP491EEP-L |
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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PDIP14 |
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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 |
07/11/2017 | Product Discontinuation Notification | 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 |
09/11/2015 | Alternate assembly site Addition of an alternate assembly supplier Greatek in Taiwan. | PCN & PDN Download |
01/27/2014 | Addition of an alternate qualified 8, 14, 16, 40 PDIP assembly site, Greatek, Taiwan. Alternate assembly site. | PCN & PDN Download |
08/16/2013 | Remove 8KV contact discharge ESD specification to align with Industry Standard ESD specifications for Serial Transceiver products. Datasheet correction. | PCN & PDN Download |
07/26/2013 | 5-inch wafer with PSG 10KÅ passivation Material and other (foundry 6 inch wafer qualification) 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 |
07/26/2011 | Datasheet Change. Datasheet typos. | PCN & PDN Download |
05/10/2011 | Product Discontinuation Notice. Discontinued due to low market demand. | 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 |
09/29/2008 | Product assembly of 14/16/18 lead PDIP families will be transferred from Unisem-Ipoh (Malaysia) to Unisem-Batam (Indonesia). Business consolidation and use of environmental friendly material. | PCN & PDN Download |
04/20/2007 | Migrating product from 5um CMOS process technology to 2um CMOS process technology to be sourced from both Episil, Taiwan, and Silan, Hangzhou, China foundries. To assure continuity of supply of wafers for these products. | PCN & PDN Download |
02/28/2007 | Product Obsolescence Letter and Discontinuation Notification. Discontinued. | PCN & PDN Download |
05/08/2006 | 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 |
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.