1

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FN4831.14

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HC55185

VoIP Ringing SLIC Family

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 500

Ω (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.

Block Diagram

Features

• 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)

Applications

• Voice Over Internet Protocol (VoIP)

• Cable Modems

• Voice Over DSL (VoDSL)

• Short Loop Access Platforms

• Remote Subscriber Units

• Terminal Adapters

Related Literature

• AN9814, User’s Guide for Development Board

• AN9824, Modeling of the AC Loop

• Interfacing to DSP CODECs (Contact Factory)

• TB379 Thermal Characterization of Packages for ICs

• AN9922, Thermal Characterization and Modeling of the

RSLIC18 in the Micro Leadframe Package

VRS

VRX

VTX

-IN

VFB

F2

F1

F0

ILIM

SW-

RTD

DETALM

2-WIRE

PORT

POL

CDC

VBH

VBL

BSEL SWC

TRANSIENT

CURRENT

LIMIT

SW+

TIP

RING

TL

RD E0

BATTERY

SWITCH

RINGING

PORT

4-WIRE

PORT

TEST

ACCESS

TRANSMIT

SENSING

CONTROL

LOGIC

DETECTOR

LOGIC

DC

CONTROL

Data Sheet

December 18, 2006