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)