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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

HC5503C

Unbalanced PBX/Key System SLIC,

Subscriber Line Interface Circuit

The Intersil HC5503C is a low cost Subscriber Line Interface

Circuit (SLIC), that replaces the components of an

unbalanced discrete Analog circuit design. The monolithic

integrated design provides improved performance and

system reliability.

The SLIC 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, provides unbalanced

2-wire transmission while maintaining an excellent

longitudinal balance and limits system power consumption

on short loops.

The HC5503C provides 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 (-24V to -58V) for loop current.

Available in 22PDIP and 24SO packaging. The HC5503C is

ideally suited as a replacement for discrete line circuits in

low cost analog PABX’s, Small Office/Home Office products

or Small Key Systems.

Features

• Monolithic Integrated Device

• Single +5V Supply

• Controlled Supply of Battery Feed Current for Short Loops

(30mA)

• Allows Interfacing With All Ringing Systems

• Switch Hook Detection

• 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 Adapt-

ers (TA)

• CTI (Computer Telephony Integration) Products

Block Diagram

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG. NO.

HC5503CCP

0 to 75

22 Ld PDIP

E22.4

HC5503CCB

0 to 75

24 Ld SOIC

M24.3

LOOP FEED

SPEECH CIRCUIT

LOOP DETECTOR

BIAS

VCC

AGND

DGND

VB(INT)

TF

BGND

TIP

RING

C1

TX

RX

SHD

RS

Data Sheet

June 1998

File Number

4503