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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

HC5526

ITU CO/PABX SLIC with Low Power

Standby

The HC5526 is a subscriber line interface circuit that is

compliant with CCITT standards. Enhancements include

immunity to circuit latch-up during hot plug and absence of

false signaling in the presence of longitudinal currents.

The HC5526 is fabricated in a High Voltage Dielectrically

Isolated (DI) Bipolar Process that eliminates leakage

currents and device latch-up problems normally associated

with Junction Isolated (JI) ICs. The elimination of the

leakage currents results in improved circuit performance for

wide temperature extremes. The latch free benefit of the DI

process guarantees operation under adverse transient

conditions. This process feature makes the HC5526 ideally

suited for use in harsh outdoor environments.

Features

• DI Monolithic High Voltage Process

• Programmable Current Feed (20mA to 60mA)

• Programmable Loop Current Detector Threshold and

Battery Feed Characteristics

• Ground Key and Ring Trip Detection

• Compatible with Ericsson’s PBL3764

• Thermal Shutdown

• On-Hook Transmission

• Wide Battery Voltage Range (-24V to -58V)

• Low Standby Power

• Meets CCITT Transmission Requirements

Applications

• On-Premises (ONS)

• Key Systems

• PBX

• Related Literature

- AN9537, Operation of the HC5513/26 Evaluation Board

Block Diagram

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

HC5526CM

0 to 70

28 Ld PLCC

N28.45

HC5526CP

0 to 70

22 Ld PDIP

E22.4

HC5526IM

-40 to 85

28 Ld PLCC

N28.45

HC5526IP

-40 to 85

22 Ld PDIP

E22.4

RINGRLY

DT

DR

TIP

RING

HPT

HPR

AGND

BGND

RSN

E0

E1

C1

C2

DET

RING RELAY

DRIVER

4-WIRE

INTERFACE

VF SIGNAL

PATH

GROUND KEY

DETECTOR

LOOP CURRENT

DETECTOR

RSG

BIAS

DIGITAL

MULTIPLEXER

RING TRIP

DETECTOR

2-WIRE

INTERFACE

Data Sheet

October 1998

File Number

4151.6