DescriptionJoining Exar's proven and extensive T1/E1 device family, the company adds three new products. A single-channel XRT83SL30, a quad (four-channel) XRT83SL34, and octal (eight-channel) XRT83SL38. These devices are ideal for the high bandwidth needs from the backbone or Core to the Metro Area Network. OEM products for this technology include Multi-Service Provisioning Platforms (MSPP), access devices, media gateways, routers frame relay access devices, and wireless base stations. What is R3 TechnologyTM? Exar's R3 TechnologyTM (Reconfigurable, Relayless Redundancy) delivers key innovative features to customers designing T1/E1/J1 interface cards. The devices are Reconfigurable -- integrated termination supporting all common T1/E1/J1 line impedances (75-120 ohms) enabling customers to build boards with a single bill-of-materials. Exar's on-board reconfigurable clock synthesizer allows manufacturers to build hardware in advance and configure the product (in software) for the particular application or market at the time of shipment. Conventional approaches require fixed settings - T1, or E1, or J1, forcing customers to determine device settings before manufacturing, and carry all configurations in inventory even if they are not immediately required. Also, the series employs Relayless Redundancy eliminating the need for external relays for 1:1 and 1+1 applications by establishing a back-up channel that is brought on-line in event of failure. Product Highlights The devices support all international (North America, Europe, or Japan) line impedances at 75, 100, 110, and 120-ohms. The XRT83SL8X series has a frequency synthesizer that can take a number of different clocks and generate either a 1.544 MHz clock for T1/J1, or 2.048 MHz for E1. The devices meet, or exceed popular networking specifications ITU G.703, G.775, and ANSI T1.402. In addition, the devices support the Bellcore GR-499 core and ANSI T1.402. Also, they have a low jitter, on-chip frequency multiplier that provides the necessary clocks to the chip. The master clock that feeds the multiplier can be T1, E1, or lower rates that are frequently available on a board such as 8, 16, 56, 64, 128 and 256kHz. Other features of the family include a parallel microprocessor bus supporting both synchronous and asynchronous microprocessor interfaces for Motorola, Intel and MIPS processors, a crystal-less jitter attenuator that can be switched into either the transmit or receive path, and a quasi random signal synthesizer/detector for support bit error rate testing.
- On-Chip Frequency Multiplier
- Programmable Transmit Pulse Generator
- Supports Host or Hardware Modes
- Compliant With Leading Industry Standards
- Interfaces Seamlessly to Exar Framer Products
- Pb-Free, RoHS Compliant Versions Offered
- TAN-053, Line Card Redundancy Design With the XRT83SL38 T1/E1 SH/LH LIU ICs
- TAN-056, High Impedance Drivers During Power Failure Using XRT83SL3X/L3X LIU
- TAN-067, R3 Technology For T/E Carrier Redundancy Applications
- TAN-058, DS-1/E1 GR-1089 Surge Protection
- TAN-057, DS1/E1 Layout Recommendations
- TAN-059, DS-1/E1 Line Recovered Clock PLL Timing
- T1 Digital Cross-Connects (DSX-1)
- ISDN Primary Rate Interface
- CSU/DSU E1/T1/J1 Interface
- T1/E1/J1 LAN/WAN Routers
- Public switching Systems and PBX Interfaces
- T1/E1/J1 Multiplexer and Channel Banks
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.
Find the product page of the part that you want to get an evaluation board for and click on Parts & Purchasing. Example:
Find the icons under Buy Now or Order Samples:
Click on the Buy Now icon and see who has stock and click on the Buy button:
Alternatively, you can click on the Order Samples
If the icons are missing, then contact Customer Support.