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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
HC55171
5 REN Ringing SLIC for
ISDN Modem/TA and WLL
The HC55171 is backward compatible to the HC5517 with
the added capability of driving 5 REN loads. The HC55171 is
ideal for any modem or remote networking access
application that requires plain old telephone service POTS,
capability. The linear amplifier design allows a choice of
Sinusoidal, Square wave or Trapezoidal ringing. The voltage
feed architecture eliminates the need for a high current gain
node achieving improved system noise immunity, an
advantage in highly integrated systems.
The device is manufactured in a high voltage Dielectric
Isolation (DI) process with an operating voltage range from
-16V, for off-hook operation and -80V for ring signal injection.
The DI process provides substrate latch up immunity,
resulting in a robust system design.
Features
5 REN Thru SLIC Ringing Capability to 75V
PEAK
Trapezoid, Square and Sinusoid Ringing Capability
Bellcore Compliant Ringing Voltage Levels
Lowest Component Count Trapezoidal Solution
Single Additional +5V Supply
Pin For Pin Compatible With HC5517
DI Provides Latch-Up Immunity
Applications
ISDN Internal/External Modems
ISDN Terminal Adapters/Routers
Wireless Local Loop Subscriber Terminals
Cable Telephony Set-Top Boxes
Digital Added Main Line
Integrated LAN/PBX
Related Literature
- AN9606, Operation of the HC5517/171 Evaluation
Board
- AN9607, Impedance Matching Design Equations
- AN9628, AC Voltage Gain
- AN9608, Implementing Pulse Metering
- AN9636, Implementing an Analog Port for ISDN Using
the HC5517
- AN549, The HC-5502X/4X Telephone Subscriber Line
Interface Circuits (SLIC)
Block Diagram
Ordering Information
PART NUMBER
TEMP. RANGE
(
o
C)
PACKAGE
PKG.
NO.
HC55171IM
-40 to 85
28 Ld PLCC
N28.45
HC55171CM
0 to 75
28 Ld PLCC
N28.45
HC55171IB
-40 to 85
28 Ld SOIC
M28.3
HC55171CB
0 to 75
28 Ld SOIC
M28.3
TIP FEED
TIP SENSE
RING FEED
RING SENSE 2
V
BAT
V
CC
AGND
BGND
V
RX
V
TX
4-WIRE
INTERFACE
BIAS
- IN 1
OUT 1
V
RING
+
LOOP CURRENT
DETECTOR
SHD
ALM
I
LMT
RTD
FAULT
DETECTOR
CURRENT
LIMIT
F1
F0
RS
TST
RDI
IIL LOGIC INTERFACE
V
REF
RTI
RELAY
DRIVER
RDO
2-WIRE
INTERFACE
RING TRIP
DETECTOR
RING SENSE 1
Data Sheet
July 1998
File Number
4323.4