FN4506 Rev 2.00

Page 1 of 6

June 2004

FN4506

Rev 2.00

June 2004

HC5503T

Balanced PBX/Key System SLIC, Subscriber Line Interface Circuit

DATASHEET

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 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

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

• Pb-free Available

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

LOOP FEED

SPEECH CIRCUIT

LOOP DETECTOR

BIAS

VCC

AGND

DGND

VBAT

RF

TF

BGND

TIP

RING

C1

TX

RX

SHD

RS

Ordering Information

PART NUMBER

TEMP.

RANGE (°C)

PACKAGE

PKG.

DWG. #

HC5503TCB

0 to 75

24 Ld SOIC

M24.3

HC5503TCBZ (Note)

0 to 75

24 Ld SOIC (Pb-free) M24.3

HC5503TCBZ96

(Note)

0 to 75

24 Ld SOIC

Tape & Reel (Pb-free)

M24.3

NOTE: Intersil Pb-free products employ special Pb-free material

sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which is compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J Std-020B.

NOT RECOMMEND

ED FOR NEW DES

IGNS

RECOMMENDED R

EPLACEMENT PAR

T

HC5503PRC