The RSLIC18 family of
ringing subscriber line
interface circuits (RSLIC)
supports analog Plain Old
TelephoneService (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 RSLIC18 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 in the RSLIC18 family:
HC55180, HC55181, HC55182, HC55183 and HC55184.
The architecture for this family is based on a voltage feed
amplifier design using low fixed loop gains to achieve high
analog performance with low susceptibility to system
induced noise.
Block Diagram
POLCDCVBHVBL
RINGING
PORT
VRS
ILIM
DC
CONTROL
BATTERY
SWITCH
Features
• Battery Operation to 100V
• Low Standby Power Consumption of 50mW
• Peak Ringing Amplitude 95V, 5 REN
• Sinusoidal or Trapezoidal Ringing Capability
• Integrated CODEC Ringing Interface
• Integrated MTU DC Characteristics
• Low External Component Count
• Pulse Metering and On Hook Transmission
• Tip Open Ground Start Operation
• Thermal Shutdown with Alarm Indicator
• 28 Lead Surface Mount Packaging
• Dielectric Isolated (DI) High Voltage Design
• HC55180
- Silent Polarity Reversal
- 53dB Longitudinal Balance
- Loopback Test Capability
• HC55181
- Integrated Battery Switch
- Silent Polarity Reversal
- 58/53dB Longitudinal Balance
- Loopback and Test Access Capability
• HC55182
- Integrated Battery Switch
- 58/53dB Longitudinal Balance
- Loopback and Test Access Capability
• HC55183
- Integrated Battery Switch
- 45dB Longitudinal Balance
• HC55184
- Integrated Battery Switch
- Silent Polarity Reversal
- 45dB Longitudinal Balance
Applications
TIP
RING
SW+
SW-
2-WIRE
PORT
TEST
ACCESS
TRANSMIT
DETECTOR
RTD RD
SENSING
LOGIC
E0
28
DET ALM
• Wireless Local Loop (WLL)
• Digital Added Main Line (DAML)/Pairgain
• Integrated Services Digital Network (ISDN)
• Small Office Home Office (SOHO) PBX
4-WIRE
PORT
VRX
VTX
-IN
VFB
• Cable/Computer Telephony
CONTROL
LOGIC
BSEL
F2
F1
F0
SWC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Negative Power Supply (VBH, VBL) (180, 181, 182) . -16V to -100V
Negative Power Supply (VBH, VBL) (183, 184) . . . . . . -24V to -75V
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 operationofthe
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical SpecificationsUnless Otherwise Specified, T
VBH= -100V, -85V or -75V, VCC = +5V, AGND = BGND = 0V, loop current limit = 25mA. All AC Parameters are
specified at 600Ω 2-wire terminating impedance over the frequency band of 300Hz to 3.4kHz. Protection
resistors = 0Ω. These parameters apply generically to each product offering.
PARAMETERTEST CONDITIONSMINTYPMAXUNITS
RINGING PARAMETERS (Note 2)
VRS Input Impedance (Note 3)480--kΩ
Differential Ringing GainVRS to 2-wire, R
4-Wire to 2-Wire Ringing Off IsolationActive mode, referenced to VRS input.-60-dB
2-Wire to 4-Wire Transmit IsolationRinging mode referenced to the differential ringing
AC TRANSMISSION PARAMETERS (Notes 5, 6)
Receive Input Impedance (Note 3)160--kΩ
Transmit Output Impedance (Note 3)--1Ω
4-Wire Port Overload LevelTHD = 1%3.13.5-V
2-Wire Port Overload LevelTHD = 1%3.13.5-V
2-Wire Return Loss300Hz ≤ f < 1kHz3045-dB
Longitudinal Current Capability (Per Wire) (Note 3)Test for False Detect20--mA
4-Wire to 2-Wire Insertion Loss-0.200.0+0.30dB
2-Wire to 4-Wire Insertion Loss-6.22-6.02-5.82dB
4-Wire to 4-Wire Insertion Loss-6.22-6.02-5.82dB
Idle Channel Noise 2-WireC-Message-1619dBrnC
Idle Channel Noise 4-WireC-Message-1013dBrnC
DC PARAMETERS (Note 6)
Loop Current Limit Programming Range (Note 5)Max Low Battery = -52V15-45mA
Loop Current During Low Power StandbyForward polarity only.18-26mA
= 0oC to 70oC for the HC55183, 184 only, all others -40oC to 85oC, VBL = -24V,
Electrical SpecificationsUnless Otherwise Specified, T
VBH= -100V, -85V or -75V, VCC = +5V, AGND = BGND = 0V, loop current limit = 25mA. All AC Parameters are
specified at 600Ω 2-wire terminating impedance over the frequency band of 300Hz to 3.4kHz. Protection
resistors = 0Ω. These parameters apply generically to each product offering. (Continued)
VBL to 2-Wire300Hz ≤ f ≤ 3.4kHz-30-dB
VBL to 4-Wire300Hz ≤ f ≤ 3.4kHz-35-dB
VBH to 2-Wire300Hz ≤ f ≤ 3.4kHz-33-dB
VBH to 4-Wire300Hz ≤ f ≤ 1kHz-40-dB
= 0oC to 70oC for the HC55183, 184 only, all others -40oC to 85oC, VBL = -24V,
A
o
f = 1kHz-35-dB
f = 3.4kHz-28-dB
f = 1kHz-43-dB
f = 3.4kHz-33-dB
1kHz < f ≤ 3.4kHz-45-dB
C
NOTES:
2. These parameters are specified at high battery operation. For the HC55180 the external supply is set to high battery voltage, for the HC55181,
HC55182, HC55183 and HC55184, BSEL = 1.
3. These parameters are controlled via design or process parameters and are not directly tested. These parameters are characterized upon initial
design release and upon design changes which would affect these characteristics.
4. Differential Ringing Gain is measured with VRS = 0.795 V
for -75V devices.
5. These parameters are specified at low battery operation. For the HC55180, the external supply is set to low battery voltage, for the HC55181,
HC55182, HC55183 and HC55184, BSEL = 0.
6. Forward Active and Reverse Active performance is guaranteed for the HC55180, HC55181 and HC55184 devices only. The HC55182 and
HC55183 are specified for Forward Active operation only.
for -100V devices, VRS = 0.663 V
RMS
for -85V devices and VRS = 0.575 V
RMS
32
RMS
Electrical SpecificationsUnless Otherwise Specified, T
loop current limit = 25mA. All AC Parameters are specified at 600W 2-wire terminating impedance over the frequency band of 300Hz to 3.4kHz.
Protection resistors = 0W.