S E M I C O N D U C T O R
HC5521
SLIC
Subscriber Line Interface Circuit
Description
The HC5521 is a Monolithic Subscriber Line Interface Circuit
(SLIC) for Analog Subscriber Line cards in Central Of鏗乧e
and PABX switches.
The HC5521 provides a comprehensive set of features for
these applications including loop reversal, ground key detec-
tion, zero crossing ring relay operation, long loop drive and a
mutually independent setting of the receive and transmit
gains, and the two-wire impedance synthesis. An option is
also provided for eliminating transhybrid balance on-chip.
Advanced power management features combined with a
small 44 lead MQFP package allow signi鏗乧ant board space
to be freed up for additional line circuits.
The HC5521 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.
ADVANCE INFORMATION
January 1997
Features
鈥?Normal and Reversed DC Feed
鈥?30mA Current Limit
鈥?Ringing, Test-In, and Test-Out Relay Drivers
鈥?Ground Key Detector with Seperate Logic Output
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
Applications
鈥?PABX/CO Line Circuits
Ordering Information
PART NUMBER
HC5521CQ
HC5521CM
TEMP.
RANGE (
o
C)
0 to 70
0 to 70
PACKAGE
44 Ld MQFP
44 Ld PLCC
PKG. NO.
Q44.10x10
N44.65
Block Diagram
RX
TA
TB
GKDO
SHDO
D2PRI
D3PDI
D4RCI
D5TBI
D6TAI
AGND
BGND
RGND
V
BAT
V
CC
V
EE
BIAS
BATTERY
REFERENCE
RING
CONTROL
RD
RBH
RBL
CRTD
RPSB
POWER
MANAGEMENT
RPSR
RPST
RPSG
LOGIC
2-WIRE
INTERFACE
TIP
TIPSEN
RINGSEN
RING
TEST
CONTROL
4-WIRE INTERFACE / Z
0
TX
TX4W
RN
KZO
CP
RDC
CDC
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
漏
Harris Corporation 1997
File Number
4265
4-35
1
