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
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 with each version providing voltage grades of high battery voltage and longitudinal balance. The voltage feed amplifier design uses low fixed loop gains to achieve high analog performance with low susceptibility to system induced noise.
Onboard Ringing Generation
Compatible with Existing HC5518x Devices
Low Standby Power Consumption (75V, 65mW)
Reduced Idle Channel Noise
Programmable Transient Current Limit
Improved Off Hook Software Interface
Integrated MTU DC Characteristics
Low External Component Count
Silent Polarity Reversal
Pulse Metering and On Hook Transmission
Tip Open Ground Start Operation
Balanced and Unbalanced Ringing
Thermal Shutdown with Alarm Indicator
28 Lead Surface Mount Packaging
Reduced Footprint Micro Leadframe Packaging
Dielectric Isolated (DI) High Voltage Design
QFN Package Option
Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline
Near Chip Scale Package Footprint; Improves PCB efficiency and has a thinner profile
Pb-free plus anneal available (RoHS compliant)
Voice Over Internet Protocol (VoIP)
Voice Over DSL (VoDSL)
Short Loop Access Platforms
Remote Subscriber Units
The HC5518XEVAL evaluation board provides a complete evaluation system for the HC55185 family of ringing SLICs. The evaluation board design consists of the HC55185 device application circuit, a single +5V CODEC for line circuit evaluations and on board logic for stand alone operation. The evaluation boards have been designed to support back to back operation, providing further insight to the complete signal path and solution.
The transient behavior of the SLIC in response to mode changes has been significantly improved with the HC55185 design. The benefit to the application is reduction or more
likely elimination of DET glitches when off hook events occur. In addition to internal circuit modifications, the change of the CFB value contributes to this functional improvement.
Please reference the HC55185 data sheet for detailed information regarding this feature.
Voltage ratings for external components have been selected based on 100V device operation, therefore compatibility to lower voltage versions is guaranteed.