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HC5503TCP

Balanced PBX/Key System SLIC, Subscriber Line Interface Circuit

Intersil 

Data Sheet

June 1998

HC5503T

File Number 4506

Balanced PBX/Key System SLIC,

Subscriber Line Interface Circuit

The Intersil HC5503T is a low cost Subscriber Line Interface

Circuit (SLIC) that replaces the components of a discrete

Transformer Analog circuit design. The monolithic integrated

design provides improved performance and system reliability.

The HC5503T provides: Current limited DC feed to the

subscriber loop, maintains a flat frequency response over the

voice band and beyond, has self resetting thermal protection

that allows conversation to continue while the fault is

present, provides a TTL subscriber off hook indication even

in the presence of longitudinal currents, and limits system

power consumption on short loops.

The HC5503T provides balanced 2-wire transmission and

has excellent longitudinal balance, while providing on hook

transmission and longitudinal current rejection in both the

on-hook or off-hook conditions.

The SLIC needs only one +5V supply in addition to the main

battery supply for loop current and operates over a range of

battery voltages (-24V to -58V).

Available in 22PDIP AND 24SO packaging. The HC5503T is

ideally suited as a replacement for discrete line circuits in

low cost analog PABXs, small Office/Home Office products

or Small Key Systems.

Block Diagram

TF

RF

VBAT

BGND

LOOP FEED

Features

• Monolithic Integrated Device

• Controlled Supply of Battery Feed Current for Short Loops

(30mA)

• Single +5V Supply

• Allows Interfacing With All Ringing Systems

• Switch Hook Detection

• Compatible With Worldwide PBX Performance

Requirements

• Low Power Consumption During Standby

Applications

• PBX Switches (Analog, Digital or ISDN)

• Key Telephone Systems (KTS)

• ISDN PC Plug in Modems

• ISDN Small Office / Home Office (SOHO) Terminal

Adapters (TA)

• CTI (Computer Telephony Integration) Products

Ordering Information

PART NUMBER

HC5503TCP

HC5503TCB

TEMP.

RANGE (oC) PACKAGE

0 to 75 22 Ld PDIP

0 to 75 24 Ld SOIC

PKG. NO.

E22.4

M24.3

TIP RING

C1

TX

SPEECH CIRCUIT

RX

LOOP DETECTOR

BIAS

RS

VCC

AGND DGND

SHD

50

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

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

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