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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

RSLIC18™ is a trademark of Intersil Corporation.

http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999

HC55180, HC55181, HC55182, HC55183, HC55184

Extended Reach Ringing SLIC Family

The RSLIC18 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 RSLIC18 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 in the RSLIC18 family:

HC55180, HC55181, HC55182, HC55183 and HC55184.

The architecture for this family is based on a voltage feed

amplifier design using low fixed loop gains to achieve high

analog performance with low susceptibility to system

induced noise.

Block Diagram

Features

• Battery Operation to 100V

• Low Standby Power Consumption of 50mW

• Peak Ringing Amplitude 95V, 5 REN

• Sinusoidal or Trapezoidal Ringing Capability

• Integrated CODEC Ringing Interface

• Integrated MTU DC Characteristics

• Low External Component Count

• Pulse Metering and On Hook Transmission

• Tip Open Ground Start Operation

• Thermal Shutdown with Alarm Indicator

• 28 Lead Surface Mount Packaging

• Dielectric Isolated (DI) High Voltage Design

• HC55180

- Silent Polarity Reversal

- 53dB Longitudinal Balance

- Loopback Test Capability

• HC55181

- Integrated Battery Switch

- Silent Polarity Reversal

- 58/53dB Longitudinal Balance

- Loopback and Test Access Capability

• HC55182

- Integrated Battery Switch

- 58/53dB Longitudinal Balance

- Loopback and Test Access Capability

• HC55183

- Integrated Battery Switch

- 45dB Longitudinal Balance

• HC55184

- Integrated Battery Switch

- Silent Polarity Reversal

- 45dB Longitudinal Balance

Applications

• Wireless Local Loop (WLL)

• Digital Added Main Line (DAML)/Pairgain

• Integrated Services Digital Network (ISDN)

• Small Office Home Office (SOHO) PBX

• Cable/Computer Telephony

Related Literature

• AN9814, User’s Guide for Development Board

• AN9824, Modeling of the AC Loop

• AN TBD, Interfacing to DSP CODECs

VRS

VRX

VTX

-IN

VFB

F2

F1

F0

ILIM

TIP

RING

SW+

SW-

RTD RD

DET ALM

RINGING

PORT

4-WIRE

PORT

CONTROL

LOGIC

BATTERY

SWITCH

TRANSMIT

SENSING

DETECTOR

LOGIC

DC

CONTROL

2-WIRE

PORT

TEST

ACCESS

E0

POL

CDC

VBH

VBL

BSEL

SWC

Data Sheet

October 1998

File Number

4519.4