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EXAR Adds Six New Devices to DS1/E1 Product Family, Propels Strategy to Offer Most Complete Line of Integrated Broadband Communications Solutions
Fully Integrated 4- and 8-Channel LIUs, 4- and 8-Channel Framers, Plus New Single-Channel E1 LIU, and Seven-Channel E1 AFE; All Minimize Design Costs and External Components

Exar Corporation, a leading provider of high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure, today announced six new products to its DS1/E1 product family. The devices are composed of fully integrated four- and eight-channel DS1/E1 Line Interface Units (LIUs), four- and eight-channel framers, plus two new European-focused products, a single-channel E1 LIU, and a seven-channel E1 Analog Front End (AFE) with clock and data recovery.

The XRT82L34 (four-channel LIU), XRT82L38 (eight-channel LIU), XRT82D20 (single-channel E1 LIU), and XRT81L27 (seven-channel E1 AFE) are compliant with applicable industry leading DS1/E1 standards. At the same time, the Company introduced the XRT84L14 (four-channel framer), and XRT84L18 (eight-channel framer) which are complementary to the LIUs. Applications for the multi-channel devices include digital cross connects, channel banks, T1/E1 multiplexers, high-speed data transmission line cards, as well as public switching systems and PBX interfaces. The single-channel E1 LIU can also be used in DECT (Digital European Cordless Telephone) base stations.

With the advent of these six new devices, Exar now has the most expansive T/E carrier product line in the industry, covering both T1/E1 and T3/E3,'' said Dr. Roubik Gregorian, senior vice president and general manager, Communications division, and CTO, of Exar Corporation. ``We now provide LIUs, framers, jitter attenuators, ATM UNIs, and M13 multiplexers for the DS3/E3 market, as well as highly integrated DS1/E1 devices. No other supplier can claim as broad a product family.''

"The higher integration levels offered by these new devices greatly reduce component requirements for T1/E1 transmission applications,'' said Hugh Wright, director of marketing for the Communications Division at Exar Corporation. "This capability offers customers lower design costs, and accelerates time-to-market.''

LIU Product Details

The two DS1/E1 LIUs include clock and data recovery, line drivers and jitter attenuators on a single chip. Both the four- and eight-channel product meets G.772 monitoring standard and allows redundancy to be built into the system without additional components. It also supports 1149.1 compliant JTAG in-circuit test capability, and allows improved manufacturing yield during system assembly.

Each channel consists of a receiver with equalizer for reliable clock and data recovery, and a transmitter, which accepts either single or dual-rail inputs for signal transmission to the line using a low impedance line driver. Each device also includes a crystal-less jitter attenuator which, depending on system requirements, can be selected to receive or transmit through the Host or Hardware Mode control.

The parts meet or exceed specifications in ITU G.703, G.775, G.736 and G.823; TR-TSY-000449; ANSI T1.403 and ETSI 300-166. All parts are low power CMOS devices and require only a single 3.3 Volt supply. All digital inputs are 5 Volt tolerant.

Framer Product Details

Both DS1 devices are fully independent, full duplex framers that support D4, ESF, T1DM and SLC-96 formats. They support input PCM and signaling data from 1.544 to 8.192 MHz, as well as 4-channel multiplexed 12.352/16.384 Mbit/sec backplane busses that interface with industry standard busses. In addition, two 512-bit elastic store frame slip buffers are included for each channel, and shared HDLC controllers support LAP-D messaging. The XRT84L14 is pin compatible to the already available XRT84V24 E1 framer. The XRT84L18 supports 1149.1 JTAG.

E1 Product Details

The XRT82D20 is a full-featured single-channel E1 LIU. The XRT82D20 has duty cycle correction circuitry to generate output transmit pulses compliant with ITU-T G.703, and it also detects and clears LOS (loss of signal) to be fully compliant with ITU-T G.775. At the same time, the Company introduced its XRT81L27IV seven-channel analog front end (AFE) with clock and data recovery, which allows customers to implement physical layer solutions without additional devices. The part is targeted for the same markets as the LIU products.

The XRT81L27 includes seven independent E1 (CEPT) analog front ends (receiver/transmitter pairs with clock recovery) allow the physical layer of a 21 line systems to be implemented with only three devices. The chip contains duty cycle correction circuitry so that the AFE can generate output transmit pulses compliant with ITU-T G.703 independent of the duty cycle of the transmit clock. It also detects and clears LOS per ITU-T G.775.

Price & Availability

The XRT82L34IV (four-channel), packaged in a 100-pin TQFP, is $27 in 1K units, and the XRT82L38IV (eight-channel), packaged in a 144-pin TQFP, is $48.64 in sample quantities. The XRT82D20IW, packaged in a 28-pin SOIC package is $7.64 in 1K quantities. The XRT81L27IV is $27.95 in 1K quantities and comes in a 128-pin TQFP package. Samples for these devices will be available in Q1 CY '01, with production in Q2 CY '01. The XRT84L14IV (four-channel) in a 208-pin PQFP, is $36 for 1K quantities, and the XRT84L18IV (eight-channel) in a 352-pin BGA, is $61.20 for 1K units. Sample parts will be available in Q4 with production volumes in Q1 CY '01. All of these products support the industrial temperature range.

About EXAR

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