SP3508

Rugged 3.3V, 20Mbps, 8 Channel Multiprotocol Transceiver with Programmable DCE/DTE and Termination Resistors
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Overview

Information Rugged 3.3V, 20Mbps, 8 Channel Multiprotocol Transceiver with Programmable DCE/DTE and Termination Resistors
Supported Protocols RS232, RS449, EIA530, EIA530A, V.10, V.11, V.28, V.35, V.36, X.21
Supply Voltage (Nom) (V) 3.3
No. of Tx 8
No. of Rx 8
Data Rate (Mbps) 20
HBM ESD (kV) 2
Internal Termination Complete
VL Pin
Temperature Range (°C) 0 to 70, -40 to 85
Package LQFP-100
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The SP3508 is a monolithic device that supports eight (8) popular serial interface standards for Wide Area Network (WAN) connectivity. The SP3508 is fabricated using a low power BiCMOS process technology, and incorporates a regulated charge pump allowing +3.3V only operation. Exar's patented charge pump provides a regulated output of +5.5V, which will provide enough voltage for compliant operation in all modes. Eight (8) drivers and eight (8) receivers can be configured via software for any of the above interface modes at any time. The SP3508 requires no additional external components for compliant operation for all of the eight (8) modes of operation other than six capacitors used for the internal charge pump. All necessary termination is integrated within the SP3508 and is switchable when V.35 drivers and V.35 receivers, or when V. receivers are used. The SP3508 provides the controls and transceiver availability for operating as either a DTE or DCE.

Additional features with the SP3508 include internal loopback that can be initiated in any of the operating modes by use of the LOOPBACK pin. While in loopback mode, receiver outputs are internally connected to driver inputs creating an internal signal path bypassing the serial communications controller for diagnostic testing. The SP3508 also includes a latch enable pin with the driver and receiver address decoder. The internal V. or V.35 termination can be switched off using a control pin (TERM_OFF) for monitoring applications. All eight (8) drivers and receivers in the SP3508 include separate enable pins for added convenience. The SP3508 is ideal for WAN serial ports in networking equipment such as routers, access concentrators, network muxes, DSU/CSU's, networking test equipment, and other access devices.


  • Fast 20Mbps Differential Transmission Rates
  • Internal Transceiver Termination Resistors for V.11 & V.35
  • Interface Modes:
    • RS-232 (V.28)
    • EIA-530 (V.10 & V.11)
    • EIA-530A (V.10 & V.11)
    • X.21 (V.11)
    • RS-449/V.36
    • V.35 (V.35 & V.28)
  • Protocols are Software Selectable with 3-Bit Word
  • Eight (8) Drivers and Eight (8) Receivers
  • Termination Network Disable Option
  • Internal Line or Digital Loopback for Diagnostic Testing
  • Certified conformance to NET1/NET2 and TBR-1
  • TBR-2 by TUV Rheinland (TBR2/30451940.001/04)
  • Easy Flow-Through Pinout
  • +3.3V Only Operation
  • Individual Driver and Receiver Enable/Disable Controls
  • Operates in either DTE or DCE Mode

Documentation & Design Tools

All Types Data Sheets Application Notes Product Briefs & Brochures Design Tools & Simulation Test Reports User Guides & Manuals
Type Title Version Date File Size
Data Sheets SP3508 Rugged 3.3V, 20Mbps, 8 Channel Multiprotocol Transceiver with Programmable DCE/DTE and Termination Resistors 1.0.1 February 2020 858.3 KB
Application Notes Advantages of Designing with Multi-Protocol Transceivers Application Note R00 September 2023 2.5 MB
Application Notes RS-232 and RS-485 PCB Layout Application Note R00 December 2022 2.8 MB
Application Notes ANI-14, DTE and DCE Terminology Explained B December 2006 25.4 KB
Application Notes ANI-17, Multiprotocol DTE and DCE Options B December 2006 34.6 KB
Application Notes ANI-03, Using Sipex SP3508 Multi-Protocol with QUICC™ or PowerQUICC™ Communications Processors C November 2006 80 KB
Application Notes ANI-16, Design Guide for Multi-Protocol Serial Ports A November 2005 462.9 KB
User Guides & Manuals SP3508 Evaluation Board Manual 1.0.0 August 2004 607.7 KB
Product Brochures Interface Brochure November 2023 3.7 MB
Test Reports NET1/2 and TBR1/2 Certification 1.0.0 April 2009 991.6 KB
Product FAQs SP3508 FAQ 1.0.0 April 2006 50.1 KB
Simulation Models
Package Type Vcc Temp Mode Version File
LQFP 3.3V Commercial V.10 2
LQFP 3.3V Commercial V.28 2
LQFP 3.3V Commercial V.35 2
LQFP 3.3V Industrial V.10 2
LQFP 3.3V Industrial V.28 3
LQFP 3.3V Industrial V.35 3
LQFP 3.3V Commercial 1
LQFP 3.3V Industrial 2
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SP3508CF-L N Y Y Y Y L3 / 260ᵒC LQFP100
SP3508EF-L N Y Y Y Y L3 / 260ᵒC LQFP100

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

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement Buy Now Order Samples PDN
SP3508CF LQFP100 0 70 OBS
SP3508CF-L LQFP100 0 70 Active Order
SP3508EF LQFP100 -40 85 OBS
SP3508EF-L LQFP100 -40 85 Active Order
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.

Packaging

Pkg Code Details Quantities Dimensions PDF
LQFP100
  • JEDEC Reference: MS-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 45.7ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 1000¹
  • Quantity per Tube: n/a
  • Quantity per Tray: 90
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 20
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 14.00
  • Width: 14.00
  • Thickness: 1.60
  • Lead Pitch: 0.50

Notifications

Distribution Date Description File
04/04/2017 Qualification of alternate assembly subcon, Greatek, Taiwan.
01/11/2016 Alternate foundry Addition of Silan as an alternate foundry.
10/03/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan). Material change and alternate assembly site.
03/08/2012 Wafer Fabrication Facility Wafer foundry request.
08/10/2011 Material change and a new assembly & test supplier (ASE, Kunshan). Business consolidation.
07/30/2010 Process Change. Capacity enhancement.
01/30/2009 Notice of Last-time Buy and Obsolescence Package Discontinuation Notice
01/08/2008 Change of assembly subcontractor for all Sipex part numbers packaged in the 100 lead LQFP packages from Carsem to Unisem’s Batam plant (formerly AIT), and conversion of all Sipex part number in 80 lead MQFP packages built at Carsem to 80 lead LQFP packages built at Unisem’s Batam plant (formerly AIT). Current subcontractor, Carsem, is discontinuing the packages.
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.
06/26/2006 Amendment of PCN transferring certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Episil instead of Silan. 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
05/08/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. 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
02/02/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. 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

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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.

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.

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.
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