Programmable RS232/RS485/RS422 Serial Transceiver
Data Sheet


The SP336 is a programmable RS-232 and/or RS-485/RS-422 transceivers. The SP336 contains four drivers and four receivers when selected in RS-232 mode; and two drivers and two receivers when selected in RS-485 mode.  In addition, it may be configured for RS-232 and RS-485/RS-422 mix mode configuration.

The RS-232 transceivers can typically operate at 250kbps or 1Mbps while adhering to the RS-232 specifications. The RS-485/RS-422 transceivers can operate at 250kbps and 10Mbps while adhering to the RS-485/RS-422 specifications. The slew rate control pin minimizes problems with reflections on long and un-terminated cables.  The RS-485/422 and RS-232 drivers and receivers can be disabled (High-Z output) by the three mode select pins.


  • +3.3V or +5V Supply Voltage Operation
  • Software Programmable RS-232 or RS-485/RS-422 Selection
  • Four RS-232 Drivers and Four Receivers in RS-232 Mode
  • Two RS-485/RS-422 Full-Duplex Transceivers in RS-485/RS-422 Mode
  • Mixed RS-232 and RS-485/422 Mode
  • Robust ESD Specifications:
    • ±15KV Human Body Model
    • ±15KV IEC1000-4-2 Air Discharge
    • ±8KV IEC1000-4-2 Contact Discharge
  • Slew Rate Control Feature, Low EMI
  • Advanced Failsafe - Receiver  failsafe on open, short or terminated lines
  • 1/8th Unit Load, 256 transceivers on bus
  • Full Differential Driver Tri-State (Hi-Z) Control
  • Receiver Output Tri-State Control


Design Tools

Simulation Models
Package Type Vcc Temp Mode Version File
SOIC-W 3.3V Commercial 000 1
SOIC-W 3.3V Commercial 001 1
SOIC-W 3.3V Commercial 010 1
SOIC-W 3.3V Commercial 011 1
SOIC-W 3.3V Commercial 100 1
SOIC-W 3.3V Commercial 101 1
SOIC-W 3.3V Commercial 110 1
SOIC-W 5.0V Commercial 000 1
SOIC-W 5.0V Commercial 001 1
SOIC-W 5.0V Commercial 010 1
SOIC-W 5.0V Commercial 011 1
SOIC-W 5.0V Commercial 100 1
SOIC-W 5.0V Commercial 101 1
SOIC-W 5.0V Commercial 110 1
TSSOP 3.3V Commercial 001 1
TSSOP 3.3V Commercial 010 1
TSSOP 3.3V Commercial 011 1
TSSOP 3.3V Commercial 100 1
TSSOP 3.3V Commercial 101 1
TSSOP 3.3V Commercial 110 2
TSSOP 5.0V Commercial 000 1
TSSOP 5.0V Commercial 001 1
TSSOP 5.0V Commercial 010 1
TSSOP 5.0V Commercial 011 1
TSSOP 5.0V Commercial 100 1
TSSOP 5.0V Commercial 101 1
TSSOP 5.0V Commercial 110 1
SOIC-W 3.3V Commercial 1
SOIC-W 3.3V Industrial 001 1
SOIC-W 3.3V Industrial 010 1
SOIC-W 3.3V Industrial 011 1
SOIC-W 3.3V Industrial 100 1
SOIC-W 3.3V Industrial 101 1
SOIC-W 3.3V Industrial 110 1
SOIC-W 5.0V Industrial 000 1
SOIC-W 5.0V Industrial 001 1
SOIC-W 5.0V Industrial 010 1
SOIC-W 5.0V Industrial 011 1
SOIC-W 5.0V Industrial 100 1
SOIC-W 5.0V Industrial 101 1
SOIC-W 5.0V Industrial 110 1
TSSOP 3.3V Industrial 000 1
TSSOP 3.3V Industrial 001 1
TSSOP 3.3V Industrial 001 1
TSSOP 3.3V Industrial 010 1
TSSOP 3.3V Industrial 100 1
TSSOP 3.3V Industrial 101 1
TSSOP 3.3V Industrial 110 1
TSSOP 5.0V Industrial 000 1
TSSOP 5.0V Industrial 001 1
TSSOP 5.0V Industrial 010 1
TSSOP 5.0V Industrial 011 1
TSSOP 5.0V Industrial 100 1
TSSOP 5.0V Industrial 101 1
TSSOP 5.0V Industrial 110 1
Evaluation Board Schematics & Design Files


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-153
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 76ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 50
  • Quantity per Reel: 2500
  • Quantity per Tube: 50
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 9.70
  • Width: 4.40
  • Thickness: 1.2
  • Lead Pitch: 0.65
  • JEDEC Reference: MS-013
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 58.6ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 27
  • Quantity per Reel: 1500
  • Quantity per Tube: 27
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 12
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 17.90
  • Width: 7.50
  • Thickness: 2.65
  • Lead Pitch: 1.27

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
SP336ECT-L WSOIC28 0 70 OBS Suggested:
SP336ECT-L/TR WSOIC28 0 70 OBS Suggested:
SP336ECY-L TSSOP28 0 70 Active Order
SP336ECY-L/TR TSSOP28 0 70 OBS Suggested:
SP336EET-L WSOIC28 -40 85 OBS Suggested:
SP336EET-L/TR WSOIC28 -40 85 OBS Suggested:
SP336EEY-L TSSOP28 -40 85 Active Order
SP336EEY-L/TR TSSOP28 -40 85 Active Order
XR21B1420IL28-0A-EVB Board Active
Show obsolete parts
Part Status Legend
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.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
SP336ECY-L N Y Y Y L1 / 260ᵒC TSSOP28
SP336EEY-L/TR N Y Y Y L1 / 260ᵒC TSSOP28
SP336EEY-L N Y Y Y L1 / 260ᵒC TSSOP28

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.
Distribution Date Description File
12/12/2018 Product Discontinuation Notice
05/30/2018 Fab transfer including re-design for new foundry process rules. Qualification of TSMC foundry for 0.25um HV20 process.
04/19/2018 Qualification of alternate assembly subcon Greatek using copper wire.
07/11/2017 Product Discontinuation Notification
05/10/2017 Qualification of alternate assembly subcon, JCET.
02/23/2017 Qualification of alternate assembly subcon, ANST, China.
02/09/2016 Qualification of alternate foundry subcon, Silan.
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).
05/23/2013 Qualified copper wire bonding assembly in addition to currently qualified gold wire bonding assembly in Carsem. Material change.
03/08/2012 Wafer Fabrication Facility Wafer foundry request.
02/07/2011 Datasheet change: Datasheet is revised to increase the maximum driver output enable and disable times from 900ns to 1500ns for RS-485/RS-422 slew rate limited mode with a data rate of up to 250kbps. To correct typo errors.
07/30/2010 Process Change. Capacity enhancement.
07/15/2010 Change in packing quantity per reel and also carrier tape width/pitch. Standardization


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.

Frequently Asked Questions

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)









For RS-485 / RS-422 the data rate can exceed 10Mbps depending on the cable length. A cable length of 15 meters (50 feet) will do a maximum of 10Mbps. A cable length of 1200 meters (4000 feet) will do a maximum of 90kbps over 24 AWG gauge twisted pair cable (with 10 pF/ft). Refer to Annex A TIA/EIA-422-B.

ESD tests are “destructive tests.” The part is tested until it suffers damage. Therefore parts cannot be 100% tested in production, instead a sample of parts are characterized during the product qualification. The test procedure consists of “zapping” pins with a given voltage using the appropriate model and then running the part through electrical tests to check for functionality or performance degradation.

ESD is caused by static electricity. In order for an ESD event to occur there must be a buildup of static charge. Very high charge levels are actually quite rare. In a normal factory environment, taking basic ESD precautions (grounding-straps, anti-static smocks, ionizers, humidity control, etc.) static levels can be kept below a few tens of volts. In an uncontrolled environment, like an office, static levels rarely get above 2000 volts. Under some worstcase conditions (wearing synthetic fabrics, rubbing against synthetic upholstered furniture, extremely low humidity)
levels can go as high as 12 to 15 thousand volts. Actually to get to 15000 volts or higher you would need to be in an uncomfortably dry environment (humidity below 10%) otherwise static charge will naturally dissipate through corona discharge. It would definitely be considered a “bad hair day.” Humans can generally feel a static shock only above 3000 volts. A discharge greater than 4000 volts can cause an audible “pop.” But repeated lower level discharges can be imperceptible and still may have a cumulative damaging effect on sensitive ICs. All ICs, even those with robust protection, can be damaged if they are hit hard enough or often enough.

Most ICs in a typical system are at greatest risk of ESD damage in the factory when the PCB is assembled and the system is being built. After the system is put together they are soldered onto the PCB and shielded within a metal or plastic system enclosure. Interface ICs are designed to attach to an external connector that could be exposed to ESD when a cable is plugged in or when a person or object touches the connector. These interface pins are most likely to see ESD exposure and therefore benefit from additional protection.

Actually the letter “E” could have two different meanings, depending on where it is in the part number. Most of our interface devices are available in different temperature grades. Commercial temperature (0 to 70C) has a “C” after the numeric part number. Industrial-extended temperature (-40 to +85C) use the letter E. So for example SP485CN is commercial and SP485EN is industrial. The second letter indicates the package type, in this case N for narrow-SOIC. Another E in the suffix indicates that this device has enhanced ESD protection, typically of ±15000Volts on the interface pins. Devices that do not have the enhanced ESD still contain built-in ESD protection of at least ±2000Volts. For example the SP485ECN is ESD rated up to ±15kV, and the SP485CN is rated for ±2kV HBM.

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:


And then Product Change Notifications:


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

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