S E M I C O N D U C T O R
HC5520
CO/PABX Polarity Reversal
Subscriber Line Interface Circuit
Description
The HC5520 is a Monolithic Subscriber Line Interface Circuit
(SLIC) for Analog Subscriber Line cards in Central Office
and PABX switches.
The HC5520 provides a comprehensive set of features for
these applications including loop reversal, zero crossing
ringing relay operation, long loop drive and a mutually inde-
pendent setting of the receive and transmit gains, and the
two wire impedance synthesis. Advanced power manage-
ment features combined with a small 44 lead MQFP pack-
age allow significant board space to be freed up for
additional line circuits.
The HC5520 is fabricated in a Harris state-of-the-art Bonded
Wafer High Voltage process, providing freedom from tradi-
tional JI latch-up phenomena without the use of additional
power supply filtering components or substrate tie connec-
tions. The very low parasitics and leakages associated with
this process provide an exceptionally flat performance over
frequency and temperature.
April 1997
Features
• Normal and Reversed DC Feed
• Current Limited Loop Feed
• Ringing, Test-In, and Test-Out Relay Drivers
• Thermal Shutdown Protection with Alert Signal
• On-Hook Transmission
• Selectable Transmit and Receive Gain Setting
• Selectable 2-Wire Impedance Matching
• Zero Crossing Ring Trip Detection and Ring Relay
Release
• Parallel Digital Control and Status Monitoring
• Protection Resistors Inside Feedback Loop Allows the
Use of PTC Devices Without Impact on Longitudinal
Balance
• Thermal Management Features
Ordering Information
TEMP.
PART NUMBER RANGE (
o
C)
HC5520CQ
HC5520CM
0 to 70
0 to 70
PACKAGE
44 Ld MQFP
44 Ld PLCC
PKG. NO.
Q44.10x10
N44.65
Applications
• CO/PABX Line Circuits
Block Diagram
R
X
TA
TB
TSDO
SHDO
PRI
PDI
RCI
TBI
TAI
RING
CONTROL
RD
R
BH
R
BL
C
RTD
BIAS
BATTERY
REFERENCE
R
PSB
POWER
MANAGEMENT
R
PSR
R
PST
R
PSG
C
P
R
DC
C
DC
LOGIC
HC5520
2-WIRE
INTERFACE
TIP
TIPSEN
RINGSEN
RING
TEST
CONTROL
4-WIRE INTERFACE / Z
0
T
X
T
X4W
R
N
K
ZO
AGND
BGND
RGND
V
BAT
V
CC
V
EE
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
©
Harris Corporation 1997
File Number
4148.2
1
HARRIS [ HARRIS CORPORATION ]
