HC5517IM

Telecom Overview

The HC5517IM is a telecommunications Subscriber Line Interface Circuit (SLIC) manufactured by Harris Corporation, now part of Renesas Electronics. It is designed for Plain Old Telephone Service (POTS) applications in ISDN modems and wireless local loop systems. The device supports ringing loads up to 3 REN with voltage levels compliant with Bellcore standards. It features a linear amplifier design allowing sinusoidal, square wave, or trapezoidal ringing outputs. The component operates on a single +5V supply and includes latch-up immunity via the DI pin.

Telecom Feature Summary

• Supports ringing loads up to 3 REN with compliance to Bellcore voltage standards
• Offers selectable ringing waveform options including sinusoidal, square wave, and trapezoidal shapes
• Utilizes a voltage feed architecture to eliminate high current gain nodes and improve noise immunity
• Provides latch-up immunity through the dedicated DI pin

Telecom Applications

• ISDN internal and external modems
• Wireless Local Loop (WLL) subscriber terminals
• Cable telephony set-top boxes
• Digital Added Main Line (DAML) systems

Telecom Procurement Notes

Verify the manufacturer status as Harris Corporation has undergone corporate restructuring and its semiconductor assets were acquired by Intersil, which was subsequently acquired by Renesas Electronics. Confirm that the specific HC5517IM variant matches the required package type and temperature rating for your application. Ensure compatibility with existing circuit designs referencing legacy Harris documentation.

Telecom Selection Notes

Select this component for POTS applications requiring support for up to 3 REN loads. It is suitable for designs needing flexible ringing waveform generation without complex external components. Consider the single +5V supply requirement and verify that the system environment benefits from the improved noise immunity provided by the voltage feed architecture compared to traditional current-fed SLICs.

Telecom Part Context

The HC5517IM belongs to the HC-5500 series of telephone interface circuits. It is functionally related to the HC5517 but offers enhanced load driving capabilities. The component is often referenced alongside evaluation boards and application notes such as AN9606 and AN549 for implementation guidance in integrated LAN/PBX and remote networking access systems.

Telecom Replacement Considerations

The HC5517IM is pin-for-pin compatible with the HC5517. Designers may consider the HC55171IM if a higher load capacity of 5 REN is required while maintaining compatibility.