CS61577

T1/E1 Low-Power Line Interface Unit

Overview

Power Supply (V)	Control Modes	Line Coders	Number of Channels	TBR-12 Compliant	Impedance Matching Line Driver	Package
5	Host, H/W & Extended H/W	AMI, B8ZS & HDB3	1		—	28 PLCC

Description

The CS61577 is a drop-in replacement for the CS61574 and combines the complete analog transmit-and-receive line interface for T1 or E1 applications in a low-power, 28-pin device operating from a 5 V supply. The CS61577 supports processor-based or standalone operation and interfaces with industry-standard T1 and E1 framers.

The receiver uses a digital DLL (delay-locked loop), which is continuously calibrated from a crystal reference to provide excellent stability and jitter tolerance. The receiver includes a jitter attenuator optimized for minimum delay in switching and transmission applications. The transmitter provides internal pulse shaping to ensure compliance with T1 and E1 pulse template specifications.

Features

• Provides analog transmission line interface for T1/E1 applications
• Drop-in replacement for CS61574 with the following enhancements
• Lower-power consumption
• Transmitter short-circuit current limiting
• Greater transmitter immunity to line reflections
• Software selection between 75 Ω and 120 Ω E1 output options
• Internally controlled E1 pulse width
• B8ZS/HDB3/AMI encoder/decoder
• Package: 28-pin PLCC; lead-free assembly

Diagram