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HC5520CM Datasheet

  • HC5520CM

  • CO/PABX Polarity Reversal Subscriber Line Interface Circuit

  • 20頁

  • HARRIS   HARRIS

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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 Of鏗乧e
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 signi鏗乧ant 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 鏗乴tering components or substrate tie connec-
tions. The very low parasitics and leakages associated with
this process provide an exceptionally 鏗俛t performance over
frequency and temperature.
April 1997
Features
鈥?Normal and Reversed DC Feed
鈥?Current Limited Loop Feed
鈥?Ringing, Test-In, and Test-Out Relay Drivers
鈥?Thermal Shutdown Protection with Alert Signal
鈥?On-Hook Transmission
鈥?Selectable Transmit and Receive Gain Setting
鈥?Selectable 2-Wire Impedance Matching
鈥?Zero Crossing Ring Trip Detection and Ring Relay
Release
鈥?Parallel Digital Control and Status Monitoring
鈥?Protection Resistors Inside Feedback Loop Allows the
Use of PTC Devices Without Impact on Longitudinal
Balance
鈥?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
鈥?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
漏
Harris Corporation 1997
File Number
4148.2
1

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