General 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 +5V supply. The CS61577 supports processor-based or standalone operation and interfaces with industry standard T1 and E1 framers.

Features
• Provides Analog Transmission Line Interface for T1 and 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 75Ω and 120Ω E1 Output Options
    - Internally Controlled E1 Pulse Width
    - B8ZS/HDB3/AMI Encoder/Decoder

Applications
• Interfacing Network Equipment such as DACS and Channel Banks to a DSX-1 Cross Connect
• Building Channel Service Units