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HC55171B

Data Sheet

July 1998

File Number

4422.1

Low Cost 5 REN Ringing SLIC

for ISDN Modem/TA and WL

The HC55171B low cost, 5 REN ringing SLIC is designed to

accommodate a wide variety of short loop applications and

provides the same degree of 鏗俥xibility as the high

performance HC55171. The 鏗俥xible features include open

circuit tip to ring DC voltages, user de鏗乶ed ringing

waveforms, ring trip detection thresholds, and loop current

limits that can be tailored for many applications. Additional

features of the HC55171B are complex impedance

matching, pulse metering, and transhybrid balance. The

HC55171B is designed for use in short loop, low cost

systems where traditional ring generation is not

economically feasible.

The device is manufactured in a high voltage Dielectric

Isolation (DI) process. The DI process provides substrate

latch up immunity, resulting in a robust system design. A

thermal shutdown with an alarm output and line fault

protection are also included for operation in harsh

environments.

Features

鈥?Load Drive Capability . . . . . . . . . . . . . . . . . . . . . . . 5 REN

鈥?Trapezoidal, Square or Sine Wave Capability

鈥?Ringing from -80V Battery . . . . . . . . . . . . . . . . . . . 75V

P-P

鈥?Ringing from -75V Battery . . . . . . . . . . . . . . . . . . . 70V

P-P

鈥?Ringing Current Independent of Loop Current Setting

鈥?Ringing Crest Factor Independent of REN Loading

鈥?Latchup Immune to Inductive Kick Back and Hot Plug

鈥?Fax, Answering Machine and MTU Compatible

鈥?Resistive and Complex Impedance Matching

鈥?Programmable Loop Current Limit

鈥?Switch Hook, Ring Trip and Ground Key Detection

鈥?Single Low Voltage +5V Supply

Applications

鈥?Solid State Line Interface Circuit for Hybrid Fiber Coax, Set

Top Box, Voice/Data Modems

鈥?Related Literature

- AN9607, Impedance Matching Design Equations

- AN9628, AC Voltage Gain

- AN9636, Implementing an Analog Port for ISDN

- AN549, The HC-5502/4X Telephone SLIC

Ordering Information

PART

NUMBER

HC55171BIM

HC55171BIB

TEMP. RANGE

(

o

C)

-40 to 85

-40 to 85

PACKAGE

28 Ld PLCC

28 Ld SOIC

PKG. NO.

N28.45

M28.3

Block Diagram

V

RX

V

TX

V

RING

+

FAULT

DETECTOR

CURRENT

LIMIT

RING TRIP

DETECTOR

BIAS

AGND

BGND

F1

F0

RS

TST

IIL LOGIC INTERFACE

RELAY

DRIVER

RDI

SHD

ALM

I

LIMIT

RTD

RDO

TIP FEED

TIP SENSE

2-WIRE

INTERFACE

4-WIRE

INTERFACE

RING FEED

RING SENSE 1

RING SENSE 2

V

REF

RTI

V

BAT

V

CC

LOOP CURRENT

DETECTOR

-

- IN 1

OUT 1

63

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

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

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