GENERAL DESCRIPTION
   The XRT82L24A is a fully integrated Quad (four channels) short-haul line interface unit for E1(2.048Mbps) 75Ω or 120Ω applications. Each channel consists of a receiver with equalizer for reliable data and clock recovery, and a transmitter which accepts either single or dual-rail digital inputs for signal transmission to the line using a low output impedance line driver. 

FEATURES
• Fully integrated quad, short-haul PCM transceivers
   for E1 applications.
• On Chip Receive Equalizer and Transmit Pulse
   Shaper for CEPT 75Ω and 120Ω line terminations
• On chip clock recovery circuit
• Transformer or capacitor coupled receiver inputs
• Crystal-less jitter attenuator can be selected in the
   transmit or receive path
• High receiver interference immunity
• Per-channel transmit power shutdown
• Tri-state transmit output capability
• On chip per-channel driver failure monitoring circuit
• On chip HDB3/B8ZS/AMI encoder/decoder functions
• Supports Gapped Clock for Multiplexer Mapper
   Applications
• Transmit return loss meets or exceeds ETSI 300
   166 standard
• Meets or exceeds specifications in ITU G.703,
   G.775, G.736 and G.823; ETSI 300-166
• Meets or exceeds G.783 and G.823 Jitter Specifications
• 3.3V or 5.0V Logic level inputs
• Single +3.3V Supply Operation
• New Patent# 6,313,671B1 Low Power IC I/O Buffer

APPLICATIONS
• Digital cross connects (DSX-1)
• Channel Banks
• High speed data transmission line cards
• E1 Multiplexer
• Public switching systems and PBX interfaces