HC5523
Data Sheet
October 1998
File Number 4144.5
LSSGR/TR57 CO/Loop Carrier SLIC with
Low Power Standby
The HC5523 is a subscriber line interface circuit which is
interchangeable with Ericsson’s PBL3764A/4 for distributed
central office applications. Enhancements include immunity
to circuit latch-up during hot plug and absence of false
signaling in the presence of longitudinal currents.
The HC5523 is fabricated in a High Voltage Dielectrically
Isolated (DI) Bipolar Process that eliminates leakage
currents and device latch-up problems normally associated
with junction isolated ICs. The elimination of the leakage
currents results in improved circuit performance for wide
temperature extremes. The latch free benefit of the DI
process guarantees operation under adverse transient
conditions. This process feature makes the HC5523 ideally
suited for use in harsh outdoor environments.
Features
• DI Monolithic High Voltage Process
• Programmable Current Feed (20mA to 60mA)
• Programmable Loop Current Detector Threshold and
Battery Feed Characteristics
• Ground Key and Ring Trip Detection
• Compatible with Ericsson’s PBL3764A/4
• Thermal Shutdown
• On-Hook Transmission
• Wide Battery Voltage Range (-24V to -58V)
• Low Standby Power
• Meets TR-NWT-000057 Transmission Requirements
• -40
o
C to 85
o
C Ambient Temperature Range
Ordering Information
PART NUMBER
HC5523IM
HC5523IP
TEMP.
RANGE (
o
C)
-40 to 85
-40 to 85
PACKAGE
28 Ld PLCC
22 Ld PDIP
PKG.
NO.
N28.45
E22.4
Applications
• Digital Loop Carrier Systems
• Fiber-In-The-Loop ONUs
• Wireless Local Loop
• Hybrid Fiber Coax
• Related Literature
- AN9632, Operation of the HC5523/15 Evaluation Board
• Pair Gain
• POTS
• PABX
Block Diagram
RINGRLY
RING RELAY
DRIVER
4-WIRE
INTERFACE
VF SIGNAL
PATH
V
TX
RSN
DT
DR
RING TRIP
DETECTOR
TIP
RING
HPT
HPR
GROUND KEY
DETECTOR
V
BAT
V
CC
V
EE
AGND
BGND
BIAS
R
D
R
DC
RSG
DET
DIGITAL
MULTIPLEXER
2-WIRE
INTERFACE
LOOP CURRENT
DETECTOR
E0
E1
C1
C2
56
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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