XRT59L91

Features:

·Complete E1 (CEPT) line interface unit (Transmitter and Receiver)
·Generates transmit output pulses that are compliant with the ITU-T G.703 Pulse Template for 2.048Mbps (E1) rates
·On-Chip Pulse Shaping for both 75W and 120W Line Drivers
·Receiver can either be transformer or capacitively- coupled to the line
·Detects and Clears LOS (Loss of Signal) per ITU-T G.775
·Compliant with the ITU-T G.823 Jitter Tolerance Requirements
·Compliant with the ITU-T G.703 EOS Overvoltage protection requirements
·Supports both Local- and Remote-Loop back Operations
·Logic Inputs accept either 3.3V or 5.0V levels
·Operates over the Industrial Temperature Range
·Ultra Low Power Dissipation
·+3.3V Supply Operation

Application

·PDH Multiplexers
·SDH Multiplexers
·Digital Cross-Connect Systems
·DECT (Digital European Cordless Telephone) Base Stations
·CSU/DSU Equipment.
·Test Equipment




Pinout






Specifications

Specifications
No. ofCH	1
DataRate(s)	E1
Clk Rec	No
SH/LH	S
Temp.Range	Ind.
OpPwr Sup/Max Cur	3.3V ±5%, 56mA
Pkgs	SOIC-16

Storage Temperature ...............-65 to + 150
Operating Temperature .............-40 to + 85
Supply Voltage ............................-0.5V to + 6.0V





Description



The XRT59L91 and XRT5997 are primarily targeted toward manufacturers of E1 equipment. Some of the primary target applications include telecommunications manufacturers utilizing multi-channel line cards, as well as, network multiplexers, central office switches anddigital cross connects.

Typical of SDH applications, E1 line cards have 21 channels. By virtue of Exar's innovative seven-channel design (XRT5997), only three devices, instead of the customary seven, are needed for a standard Analog Front End (AFE). This device count reduction improves both board real estate, and system costs allowing OEMs to offer the latest, most competitive systems to their customers.

For each device, there is an independent driver and receiver circuitry for each channel, allowing seamless Pulse Code Modulation (PCM) interfacing. Each of the drivers can be independently disabled giving designers' greater flexibility in developing optimal power management and back-up redundancy solutions.

Because both devices are based upon standard CMOS process, conversion of AMI line coded signals to TTL/CMOS logic levels is virtually automatic. In addition, designers have the flexibility to interface to either 75 or 120-Ohm lines for transformer coupled configurations.

The XRT59L91ID is available in a 16-lead JEDEC SOIC package. Similarly, the XRT5997IV is available in a 100-pin TQFP package. Both products are designed for industrial temperature ranges.