The SP508E is a monolithic device that supports eight (8) popular serial interface standards for Wide Area Network (WAN) connectivity. The SP508E is fabricated using a low power BiCMOS process technology, and incorporates an Exar regulated charge pump allowing +5V only operation. Exar's patented charge pump provides a regulated output of +5.8V, 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 SP508E requires no additional external components for compliant operation for all of the eight (8) modes of operation other than four capacitors used for the internal charge pump. All necessary termination is integrated within the SP508E and is switchable when V.35 drivers and V.35 receivers, or when V.11 receivers are used. The SP508E provides the controls and transceiver availability for operating as either a DTE or DCE.
Additional features with the SP508E 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 SP508E also includes a latch enable pin with the driver and receiver address decoder. The internal V.11 or V.35 receiver termination can be switched off using a control pin (TERM_OFF) for monitoring applications. All eight (8) drivers and receivers in the SP508E include separate enable pins for added convenience. The SP508E 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.
Applicable U.S. Patents-5,306,954; and others patents pending.
For technical support or help choosing a product please email Exar’s Serial Technical Support group at: email@example.com.
- 20Mbps Differential Transmission Rates
- 15kV ESD Tolerance for Analog I/Os
- Internal Transceiver Termination Resistors for V.11/V.35
- Interface Modes:
- RS-232 (V.28)
- EIA-530 (V.10 & V.11)
- X.21 (V.11)
- EIA-530A (V.10 & V.11)
- RS-449/V.36 – V.35 (V.10 & V.11)
- Software Selectable Protocols with 3-Bit Word
- Eight Drivers and Eight Receivers
- V.35/V.11 Receiver Termination Network Disable Option
- Internal Line or Digital Loopback Testing
- Adheres to NET1/NET2 and TBR-2 Requireme
- Easy Flow-Through Pinout
- +5V Only Operation
- Individual Driver/Receiver Enable/Disable Controls
- Operates in DTE or DCE Mode
- Frame Relay
- Secure Communication Terminals
Parts & Purchasing
|Part Number||Pkg Code||RoHS||Min Temp||Max Temp||Status||Buy Now||Order Samples|
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.
Frequently Asked Questions
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.