ISL5585
®
Data Sheet
October 2003
FN6026.4
3.3V Ringing SLIC Family for Voice Over
Broadband (VOB)
Features
• 3.3V Operation
The 3.3V family of ringing subscriber line interface circuits
(SLIC) supports analog Plain Old Telephone Service
(POTS) in short and medium loop length, wireless and
wireline voice over broadband applications. Ideally suited for
customer premise equipment, this family of products offers
flexibility to designers with high ringing voltage and low
power consumption system requirements.
• Onboard Ringing Generation
• Low Standby Power Consumption (75V, 65mW)
• Programmable Transient Current Limit
• Improved Off Hook Software Interface
• Integrated MTU DC Characteristics
• Low External Component Count
The ISL5585 family is capable of operating with 100V ringing
battery supply, which translates directly to the amount of
ringing voltage supplied to the subscriber. With the high
operating voltage, subscriber loop lengths can be extended
to 500Ω (i.e., 5,000 feet) and beyond, allowing this family to
serve emerging Fiber In The Loop (FITL) markets.
• Silent Polarity Reversal
• Pulse Metering and On Hook Transmission
• Tip Open Ground Start Operation
• Balanced and Unbalanced Ringing
• Thermal Shutdown with Alarm Indicator
• 28 Lead Surface Mount Packaging
Other key features across the product family include: 3.3V
V
operation, low power consumption, ringing using
CC
sinusoidal or trapezoidal waveforms, robust auto-detection
mechanisms for when subscribers go on or off hook, and
minimal external discrete application components.
Integrated test access features are also offered on selected
products to support loopback testing as well as line
measurement tests.
• Reduced Footprint Quad Flatpack No-lead (QFN)
Packaging
Applications
• Short Loop Access Platforms
• Voice Over Internet Protocol (VoIP)
• Voice Over Cable and DSL Modems
• Internet Protocol PBX
There are ten product offerings of the ISL5585 providing
various grades of ringing battery voltage and longitudinal
balance.
Block Diagram
• FiberTo The Home (FTTH)
• Remote Subscriber Units
• Ethernet Terminal Adapters
POL
CDC
VBL
VBH
ILIM
DC
CONTROL
BATTERY
SWITCH
RINGING
PORT
VRS
Related Literature
• AN1038, User’s Guide for Development Board
2-WIRE
PORT
TIP
AUX
VTX
-IN
• AN9824, Modeling of the AC Loop
RING
TRANSMIT
SENSING
4-WIRE
PORT
TRANSIENT
CURRENT
LIMIT
• TB379 Thermal Characterization of Packages for ICs
VFB
TL
• AN9922, Thermal Characterization and Modeling of the
RSLIC18 in the Micro Leadframe Package
F2
F1
F0
SW+
SW-
TEST
ACCESS
DETECTOR
LOGIC
CONTROL
LOGIC
RT SH E0 DET ALM
BSEL SWC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2003. All Rights Reserved.
1
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