The RSLIC-VoIP family of ringing subscriber line interface circuits (RSLIC) supports analog Plain Old Telephone Service (POTS) in short and medium loop length, wireless and wireline applications. Ideally suited for remote subscriber units, this family of products offers flexibility to designers with high ringing voltage and low power consumption system requirements. The RSLIC-VoIP family operates to 100V which translates directly to the amount of ringing voltage supplied to the end subscriber. With the high operating voltage, subscriber loop lengths can be extended to 500Ω (i.e., 5,000 feet) and beyond. Other key features across the product family include: low power consumption, ringing using sinusoidal or trapezoidal waveforms, robust auto-detection mechanisms for when subscribers go on or off hook, and minimal external discrete application components. Integrated test access features are also offered on selected products to support loopback testing as well as line measurement tests. There are five product offerings of the HC55185.
The HC55185 is part of Intersil's RSLIC‑VoIP family, providing ringing subscriber line interface circuits for analog POTS, VoIP, and DSL applications. It supports up to 100 V ringing voltage, enabling loop lengths of up to 5,000 ft and offers low power consumption with programmable transient current limits.
The device is available in 28‑lead PLCC and 32‑lead QFN packages, includes onboard ringing generation, and features a reduced external component count. Detailed electrical specifications, absolute maximum ratings, and functional improvements are provided for designers.
| Maximum Operating Voltage | 100 V |
|---|---|
| Industrial Temperature Range | -40 °C to +85 °C |
The HC55185 operates up to 100 V, which allows extended subscriber loop lengths.