The HC55171 is backward compatible to the HC5517 with the added capability of driving 5 REN loads. The HC55171 is ideal for any modem or remote networking access application that requires plain old telephone service POTS, capability. The linear amplifier design allows a choice of Sinusoidal, Square wave or Trapezoidal ringing. The voltage feed architecture eliminates the need for a high current gain node achieving improved system noise immunity, an advantage in highly integrated systems.

Features
• 5 REN Thru SLIC Ringing Capability to 75VPEAK
• Trapezoid, Square and Sinusoid Ringing Capability
• Bellcore Compliant Ringing Voltage Levels
• Lowest Component Count Trapezoidal Solution
• Single Additional +5V Supply
• Pin For Pin Compatible With HC5517
• DI Provides Latch-Up Immunity

Applications
• ISDN Internal/External Modems
• ISDN Terminal Adapters/Routers
• Wireless Local Loop Subscriber Terminals
• Cable Telephony Set-Top Boxes
• Digital Added Main Line
• Integrated LAN/PBX
• Related Literature
    - AN9606, Operation of the HC5517/171 Evaluation Board
    - AN9607, Impedance Matching Design Equations
    - AN9628, AC Voltage Gain
    - AN9608, Implementing Pulse Metering
    - AN9636, Implementing an Analog Port for ISDN Using the HC5517
    - AN549, The HC-5502X/4X Telephone Subscriber Line Interface Circuits (SLIC)