The RSLIC-VoIP family of
ringing subscriber line
interface circuits (RSLIC)
supports analog Plain Old
T elephone Service (POTS) in
short and medium loop length, wireless and wireline
applications. Ideally suited for remote subscriber units, this
family of products offers flexibility to designers with high
ringing voltage and low power consumption system
requirements.
The RSLIC-VoIP family operates to 100V which translates
directly to the amount of ringing voltage supplied to the end
subscriber. With the high operating voltage, subscriber loop
lengths can be extended to 500Ω (i.e., 5,000 feet) and
beyond.
Other key features across the product family include: low
power consumption, ringing using 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.
There are five product offerings of the HC55185 with each
version providing voltage grades of high battery voltage and
longitudinal balance. The voltage feed amplifier design uses
low fixed loop gains to achieve high analog performance
with low susceptibility to system induced noise.
Block Diagram
POLCDCVBHVBL
ILIM
DC
CONTROL
BATTERY
SWITCH
RINGING
PORT
VRS
FN4831.14
Features
• Onboard Ringing Generation
• Compatible with Existing HC5518x Devices
• Low Standby Power Consumption (75V, 65mW)
• Reduced Idle Channel Noise
• Programmable Transient Current Limit
• Improved Off Hook Software Interface
• Integrated MTU DC Characteristics
• Low External Component Count
• 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
• Reduced Footprint Micro Leadframe Packaging
• Dielectric Isolated (DI) High Voltage Design
• QFN Package Option
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Product Outline
- Near Chip Scale Package Footprint; Improves PCB
efficiency and has a thinner profile
• Pb-free plus anneal available (RoHS compliant)
Applications
• Voice Over Internet Protocol (VoIP)
• Cable Modems
• Voice Over D S L (VoDSL)
• Short Loop Access Platforms
TIP
RING
TL
2-WIRE
PORT
TRANSIENT
CURRENT
LIMIT
TRANSMIT
SENSING
4-WIRE
PORT
VRX
VTX
-IN
VFB
• Remote Subscriber Units
• Terminal Adapters
Related Literature
• AN9814, User’s Guide for Development Board
SW+
SW-
TEST
ACCESS
DETECTOR
LOGIC
RTDDET
RD E0
ALM
CONTROL
LOGIC
BSEL SWC
F2
F1
F0
• AN9824, Modeling of the AC Loop
• Interfacing to DSP CODECs (Contact Factory)
• TB379 Thermal Characterization of Packages for ICs
• AN9922, Thermal Characterization and Modeling of the
RSLIC18 in the Micro Leadframe Package
1
Copyright Intersil Americas Inc. 2001-2006. All Rights Reserved. RSLIC18™ is a trademark of Intersil Americas Inc.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
*Add "96" suffix for tape and reel
**Reference “Special Considerations for the QFN Package” text.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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LONGITUDINAL
BALANCE
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FULL
TEST
TEMP.
RANGE (°C)PACKAGE
-40 to +8528 Ld PLCCN28.45
-40 to +8528 Ld PLCC (Pb-free) N28.45
-40 to +8528 Ld PLCCN28.45
-40 to +8528 Ld PLCC (Pb-free) N28.45
-40 to +8528 Ld PLCCN28.45
-40 to +8528 Ld PLCC (Pb-free) N28.45
-40 to +8528 Ld PLCCN28.45
-40 to +8528 Ld PLCC (Pb-free) N28.45
0 to +7528 Ld PLCCN28.45
0 to +7528 Ld PLCC (Pb-free) N28.45
0 to +7532 Ld QFNL32.7x7**
0 to +7532 Ld QFN (Pb-free) L32.7x7**
0 to +8528 Ld PLCCN28.45
0 to +8528 Ld PLCC (Pb-free) N28.45
0 to +8532 Ld QFNL32.7x7**
0 to +8532 Ld QFN (Pb-free) L32.7x7**
-40 to +8528 Ld PLCCN28.45
-40 to +8528 Ld PLCC (Pb-free) N28.45
0 to +8528 Ld PLCCN28.45
0 to +8528 Ld PLCC (Pb-free) N28.45
0 to +8532 Ld QFNL32.7x7**
0 to +8532 Ld QFN (Pb-free) L32.7x7**
Uncommitted Switch (loop back or relay driver) . . . . . +5V to -100V
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
for the PLCC package is measured with the component mounted on a low effective thermal conductivity test board in free air. See T ech Brief
1. θ
JA
TB379 for details.
for the QFN package is measured in free air with the component mounted on a high effective thermal conductivity test board with direct attach
2. θ
JA
features including conductive thermal vias. θ
See Tech Brief 379 and AN9922 for additional information and board layout considerations.
Electrical SpecificationsUnless Otherwise Specified, T
(C) grade, V
All AC parameters are specified at 600Ω 2-wire terminating impedance over the frequency band of 300Hz to
3.4kHz. Protection resistors = 0Ω.
PARAMETERTEST CONDITIONSMINTYPMAXUNITS
RINGING PARAMETERS
VRS Input Impedance (Note 3)450--kΩ
Differential Ringing Gain (Note 4)Balanced Ringing, VRS to 2-Wire, R
Centering Voltage AccuracyTip, Referenced to V
Open Circuit Ringing VoltageBalanced Ringing, VRS Input = 0.840V
Ringing Voltage Total DistortionRL = 1.3 kΩ, V
4-Wire to 2-Wire Ringing Off IsolationActive Mode, Referenced to VRS Input-90-dB
2-Wire to 4-Wire Transmit IsolationRinging Mode Referenced to the Differential