Overview
Information | 3.3V to 5V Programmable RS-232/RS-485/RS-422 Serial Transceiver |
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Supported Protocols | RS232, V.28, RS485, RS422, V.24 |
Supply Voltage (Nom) (V) | 3.3, 5 |
232 Tx / Rx | 3 / 5 |
485 Tx / Rx | 2 / 2 |
RS-232 Max Data Rate (Mbps) | 1 |
RS-485/RS-422 Max Data Rate (Mbps) | 15 |
HBM ESD (kV) | 15 |
IEC 61000-4-2 Contact (±kV) | - |
120Ω Termination | |
VL Pin | |
232 Full Handshake | ✔ |
Slew Limit Pin | |
Fault Tolerance (V) | -15 to 15 |
RS-485 Duplex | Full |
Max ICC (mA) | 15 |
Temperature Range (°C) | 0 to 70, -40 to 85 |
Package | TSSOP-28 |
The SP337E is a dual mode serial transceiver containing both RS-232 and RS-485 line drivers and receivers. The RS-232 mode provides three drivers and five receivers to support all eight signals commonly used in the DB9 serial port connector (3TX/5RX). In RS-485 mode the device features two independent high speed RS-485/RS-422 transmit and receive channels (2TX/2RX). The default RS-485 configuration is full-duplex, but half-duplex operation can be obtained by tying together the TX and RI pins, and the TXEN and RXEN signals. The SP337 is pin compatible to Exar’s SP334.
The SP337EB features a maximum data rate of 250kbps in RS-232 mode and a maximum data rate of 15Mbps in RS-485. However, the SP337EUfeatures a maximum data rate of 1Mbps in RS-232 mode and a maximum data rate of 15Mbps in RS-485 mode.
The Exar-patented high efficiency charge pumps (5,306,954) deliver true RS-232 driver output voltages from a single power supply from 3.3V to 5V. Charge pump outputs are self-monitoring to minimize power consumption. The SP337E requires only four 0.1μF capacitors for complete functionality.
All RS-485 receivers or transceivers feature high impedance inputs which allow up to 256 transceivers on a single shared bus. When configured in RS-485 mode, each driver may be individually enabled or put into tri-state, simplifying use on shared buses or for bidirectional communication. The RS-485 drivers can be disabled (high-Z output) by the TXEN enable pin. The RS-232 receiver outputs can be disabled by the RXEN enable pin.
All receivers have advanced failsafe protection to prevent oscillation when inputs are un-connected. In RS-232 mode, each receiver input has a 5kΩ pull-down to ground. In RS-485 mode, receivers will default to output logic 1 if inputs are floating, shorted, or open but terminated.
All driver outputs and receiver inputs are protected against ESD strikes up to +/-15,000 volts.
- 3.3V to 5V Single Supply Operation
- Robust +/-15kV ESD Protection
- Human Body Model
- Max Data Rate of 15Mbps in RS-485/RS-422 and up to 1Mbps in RS-232 Mode (SP337EU)
- 3 Drivers, 5 Receivers RS-232/V.28
- 2 Drivers, 2 Receivers RS-485/RS-422
- Full-Duplex Configuration
- 1/8th Unit Load, up to 256 receivers on bus
- RS-485 Advanced Failsafe on Open, Short or Terminated Lines
- Full Differential Driver Tri-State (Hi-Z) Control
- Receiver Output Tri-State Control
- SOICW-28 or TSSOP-28 Package
- Dual Protocol Serial Ports (RS-232 or RS-485)
- Industrial Computers
- Industrial and Process Control Equipment
- Point-Of-Sales Equipment
- Networking Equipment
- HVAC Controls Equipment
- Building Security Equipment
Documentation & Design Tools
Type | Title | Version | Date | File Size |
---|---|---|---|---|
Data Sheets | SP337E 3.3V to 5V Programmable RS232/RS485/RS422 Serial Transceiver | 2.0.0 | July 2021 | 598.3 KB |
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 |
Application Notes | AN211, SP337 Pinout Recommendation for Single DB-9 Connector | 1.0.1 | March 2013 | 193 KB |
Application Notes | AN212, RS485 Termination Resistor Switch Solution | 1.0.0 | August 2011 | 266.1 KB |
User Guides & Manuals | XR21B1420 Evaluation Board User’s Manual | 1B | January 2020 | 1.2 MB |
Product Brochures | Interface Brochure | R01 | June 2024 | 3.6 MB |
Schematics & Design Files | XR21B1420/1421 Evaluation Board Design Files | REV 10 | June 2016 | 386.5 KB |
Simulation Models
Package Type | Vcc | Temp | Mode | Version | File |
---|---|---|---|---|---|
WSOIC-28 | 3.3V | Commercial | RS-232 | 5 | |
WSOIC | 3.3V | Commercial | RS-232 | 2 | |
WSOIC | 3.3V | Commercial | RS-485 | 2 | |
WSOIC | 5.0V | Commercial | RS-232 | 4 | |
WSOIC | 5.0V | Commercial | RS-485 | 2 | |
TSSOP | 3.3V | Commercial | RS-232 | 2 | |
TSSOP | 3.3V | Commercial | RS-485 | 2 | |
TSSOP | 5.0V | Commercial | RS-232 | 2 | |
TSSOP | 5.0V | Commercial | RS-485 | 2 | |
WSOIC | 3.3V | Industrial | RS-232 | 2 | |
WSOIC | 3.3V | Industrial | RS-485 | 2 | |
WSOIC | 5.0V | Industrial | RS-232 | 2 | |
WSOIC | 5.0V | Industrial | RS-485 | 2 | |
TSSOP | 3.3V | Industrial | RS-232 | 2 | |
TSSOP | 3.3V | Industrial | RS-485 | 2 | |
TSSOP | 5.0V | Industrial | RS-232 | 2 | |
TSSOP | 5.0V | Industrial | RS-485 | 2 |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
SP337EBEY-L | N | Y | Y | Y | Y | L1 / 260ᵒC | TSSOP28 |
SP337EUEY-L | N | Y | Y | Y | Y | L1 / 260ᵒC | TSSOP28 |
SP337EUEY-L/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | TSSOP28 |
SP337EBEY-L/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | TSSOP28 |
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 |
---|---|---|---|---|---|---|---|---|
SP337EBCT-L | WSOIC28 | 0 | 70 | OBS | SP338EER1-L | |||
SP337EBCT-L/TR | WSOIC28 | 0 | 70 | OBS | SP338EER1-L/TR | |||
SP337EBCY-L | TSSOP28 | 0 | 70 | OBS | SP337EBEY-L | |||
SP337EBCY-L/TR | TSSOP28 | 0 | 70 | OBS | SP337EBCY-L | |||
SP337EBET-L | WSOIC28 | -40 | 85 | OBS | SP337EBEY-L | |||
SP337EBET-L/TR | WSOIC28 | -40 | 85 | OBS | SP338EER1-L/TR | |||
SP337EBEY-L | TSSOP28 | -40 | 85 | Active | Click Buy Now | Order | ||
SP337EBEY-L/TR | TSSOP28 | -40 | 85 | Active | Click Buy Now | Order | ||
SP337EUCT-L | WSOIC28 | 0 | 70 | OBS | SP338EER1-L | |||
SP337EUCT-L/TR | WSOIC28 | 0 | 70 | OBS | SP338EER1-L/TR | |||
SP337EUCY-L | TSSOP28 | 0 | 70 | OBS | SP337EUEY-L | |||
SP337EUCY-L/TR | TSSOP28 | 0 | 70 | OBS | SP338EER1-L/TR | |||
SP337EUET-L | WSOIC28 | -40 | 85 | OBS | SP338EER1-L | |||
SP337EUET-L/TR | WSOIC28 | -40 | 85 | OBS | SP338EER1-L/TR | |||
SP337EUEY-L | TSSOP28 | -40 | 85 | Active | Click Buy Now | Order | ||
SP337EUEY-L/TR | TSSOP28 | -40 | 85 | Active | Click Buy Now | Order | ||
XR21B1420IL28-0A-EVB | Board | Active | Click Buy Now |
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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TSSOP28 |
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WSOIC28 |
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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 |
06/17/2020 | Process Change Notification - Refer to PCN for details | PCN & PDN Download |
06/17/2020 | Process Change Notification - Refer to PCN for details | PCN & PDN Download |
12/12/2018 | Product Discontinuation Notice | PCN & PDN Download |
04/19/2018 | Qualification of alternate assembly subcon Greatek using copper wire. | PCN & PDN Download |
07/11/2017 | Product Discontinuation Notification | PCN & PDN Download |
07/11/2017 | Product Discontinuation Notification | PCN & PDN Download |
05/10/2017 | Qualification of alternate assembly subcon, JCET. | PCN & PDN Download |
02/23/2017 | Qualification of alternate assembly subcon, ANST, China. | PCN & PDN Download |
02/15/2017 | Qualification of alternate assembly subcon, ANST. | PCN & PDN Download |
02/09/2016 | Qualification of alternate foundry subcon, Silan. | PCN & PDN Download |
07/03/2013 | Addition of qualified 6 inch wafer processing line in Episil, in addition to the currently qualified 5 inch wafer processing line. Other change (foundry 6 inch wafer qualification). | PCN & PDN Download |
05/23/2013 | Qualified copper wire bonding assembly in addition to currently qualified gold wire bonding assembly in Carsem. Material change. | PCN & PDN Download |
03/08/2012 | Wafer Fabrication Facility Wafer foundry request. | PCN & PDN Download |
07/30/2010 | Process Change. Capacity enhancement. | 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 |
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.
Videos
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.