Intersil Corporation HC5520 Datasheet
April 1997
SEMICONDUCTOR
HC5520
CO/PABX Polarity Reversal
Subscriber Line Interface Circuit
Features
• Normal and Reversed DC Feed
• Current Limited Loop Feed
• Ringing, Test-In, and Test-Out Relay Drivers
• Thermal Shutdown Protection with Alert Signal
• On-Hook Transmission
• Selectable Transmit and Receive Gain Setting
• Selectable 2-Wire Impedance Matching
• Zero Crossing Ring Trip Detection and Ring Relay
Release
• Parallel Digital Control and Status Monitoring
• Protection Resistors Inside Feedback Loop Allows the
Use of PTC Devices Without Impact on Longitudinal
Balance
• Thermal Management Features
Applications
• CO/PABX Line Circuits
Description
The HC5520 is a Monolithic Subscriber Line Interface Circuit
(SLIC) for Analog Subscriber Line cards in Central Office
and PABX switches.
The HC5520 provides a comprehensive set of features for
these applications including loop reversal, zero crossing
ringing relay operation, long loop drive and a mutually independent setting of the receive and transmit gains, and the
two wire impedance synthesis. Advanced power management features combined with a small 44 lead MQFP package allow significant board space to be freed up for
additional line circuits.
The HC5520 is fabricated in a Harris state-of-the-art Bonded
Wafer High Voltage process, providing freedom from traditional JI latch-up phenomena without the use of additional
power supply filtering components or substrate tie connections. The very low parasitics and leakages associated with
this process provide an exceptionally flat performance over
frequency and temperature.
Ordering Information
TEMP.
PART NUMBER
HC5520CQ 0 to 70 44 Ld MQFP Q44.10x10
HC5520CM 0 to 70 44 Ld PLCC N44.65
RANGE (oC) PACKAGE PKG. NO.
Block Diagram
R
TXT
X
TA
TB
TSDO
SHDO
PRI
PDI
RCI
TBI
TAI
AGND
BGND
RGND
V
BAT
V
CC
V
EE
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
TEST CONTROL
LOGIC
BIAS
BATTERY
REFERENCE
C
P
4-WIRE INTERFACE / Z
HC5520
MANAGEMENT
C
R
DC
DC
1
R
X4W
INTERFACE
N
2-WIRE
RING
CONTROL
POWER
K
ZO
0
TIP
TIPSEN
RINGSEN
RING
RD
R
BH
R
BL
C
RTD
R
PSB
R
PSR
R
PST
R
PSG
File Number 4148.2
HC5520
Absolute Maximum Ratings (Note 1) Thermal Information
VCC to AGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
VEE to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7V
V
to BGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80V
BAT
AGND to BGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3V
Digital Pins to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
ESD Withstand (Human Body Model) . . . . . . . . . . . . . . . . . . . 500V
Operating Conditions
Temperature Range
HC5520CQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to 70oC
HC5520CM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to 70oC
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:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
Recommended Operating Conditions
For maximum integrity, nominal operating conditions should be selected so that operation is always within the following ranges:
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Battery Supply V
Positive Supply V
Negative Supply V
Ringing Supply V
Loop Resistance R
Ambient Temperature T
Die Temperature T
BAT
CC
EE
RINGING
L
A
D
Thermal Resistance (Typical, Note 1) θJA (oC/W)
MQFP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
PLCC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Maximum Power Dissipation
MQFP package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.21W
PLCC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.74W
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . 150
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
(Lead tips only)
-42 -48 -58 V
4.75 5 5.25 V
-4.75 -5 -5.25 V
60 75 90 V
DC
DC
DC
RMS
200 - 1800 Ω
02570
- - 150
o
C
o
C
o
Electrical Specifications Unless Otherwise Specified: Typical Parameters are at T
= 25oC, VCC = +5V, VEE = -5V, V
A
BAT
= -48V,
AGND = BGND = RGND = 0V, Min-Max Parameters are Over Power Supply and Operating Temperature Range. All Transmission Parameters are Specified at 600Ω 2-Wire Terminating Impedance with 0dB transmit and receive gain.
CONDITIONS
PARAMETER
BAT
OTHER
CONDITIONS
FREQ/
LEVEL
MIN TYP MAX UNITSMODE LOAD V
POWER SUPPLY CURRENTS (Figure 4)
I
I
I
CC
EE
BB
normal
reverse
p’down
normal
reverse
p’down
normal
reverse
p’down
Open -48V VCC = 5V 5.0
6.0
2.0
Open -48V VEE = -5V -6.0
-7.0
-3.0
Open -48V VCC = 5V,
VEE = -5V
-7.0
-7.0
-1.0
8.0
8.9
3.7
-3.6
-4.9
-1.7
-4.2
-4.0
-0.4
11.0
12.0
5.5
-2.0
-3.0
-0.7
-2.0
-2.0
0.0
mA
mA
mA
mA
mA
mA
mA
mA
mA
THERMAL SHUTDOWN
Thermal Shutdown Temperature,
Die Temperature
normal
reverse
-48V - 150 -
o
C
BATTERY FEED CHARACTERISTICS - 2W VOLTAGES (Figure 4)
V
TIP
normal
reverse
Open -48V -5.50
-46.00
-4.16
-43.60
-2.46
-42.00VV
2
HC5520
Electrical Specifications Unless Otherwise Specified: Typical Parameters are at T
= 25oC, VCC = +5V, VEE = -5V, V
A
BAT
= -48V,
AGND = BGND = RGND = 0V, Min-Max Parameters are Over Power Supply and Operating Temperature Range. All Transmission Parameters are Specified at 600Ω 2-Wire Terminating Impedance with 0dB transmit and receive gain. (Continued)
CONDITIONS
V
RING
V
TIP
V
RING
PARAMETER
normal
reverse
normal
reverse
normal
reverse
OTHER
BAT
CONDITIONS
Open -48V -45.54
Open -42V -5.00
Open -42V -39.54
FREQ/
LEVEL
MIN TYP MAX UNITSMODE LOAD V
-6.00
-40.00
-5.00
-43.80
-4.26
-3.68
-38.12
-38.34
-3.78
-42.50
-2.00
-2.46
-37.00VV
-37.00
-2.00
V
V
V
V
BATTERY FEED CHARACTERISTICS - LOOP CURRENT (Figure 5)
Normal Loop Current normal
reverse
Normal Loop Current normal
reverse
Short Circuit Loop Current Limit normal
reverse
1800Ω -42V 14.5
14.5
1800Ω -48V 18.0
18.0
100Ω -48V 22.0
22.0
16.5
16.3
18.8
18.6
26.4
27.0
19.0
19.0mAmA
22.0
22.0mAmA
42.0
42.0mAmA
LOOP SUPERVISION - SWITCH HOOK DETECTION (Figure 6)
Off-Hook Detection normal
-48V 2.4K 4.6K 9K Ω
reverse
LOOP SUPERVISION - DIAL PULSE DISTORTION (Figure 7)
Dial Pulse Distortion normal 100Ω -58V 25
Dial Pulse Distortion normal 1800Ω -42V 25
o
C - 0.1 3 %
o
C - 0.1 3 %
LOOP SUPERVISION - RING TRIP DETECTION (Figure 8)
Ring Trip Detect Ringing 1800Ω
+1REN
Ring Trip Non-Detect Ringing 3REN//
20KΩ
60V
90V
-42V
RMS
-58V
RMS
- - 150 ms
20K - - Ω
LOOP SUPERVISION - POLARITY REVERSAL TIME (Figure 9)
Polarity Reversal Time normal
1800Ω -42V - 0.04 10 ms
to
reverse
Polarity Reversal Time reverse
1800Ω -42V - 0.04 10 ms
to
normal
LOOP SUPERVISION - DIGITAL INTERFACE
Input Low Voltage, V
Input High Voltage, V
Input Low Current, I
Input High Current, I
Output Low Voltage, V
Output High Voltage, V
IL
IH
IL
IH
OL
OH
Relay Driver Output Low Voltage, V
Relay Driver Output High Current, I
All Digital Inputs - - 0.8 V
All Digital Inputs 2.0 - - V
AGND < VIN < V
VIH < VIN < V
CC
IL
-20 - - µA
- 0 +10 µA
1 LSTTL Load - - 0.4 V
1 LSTTL Load 2.4 - - V
OLVCC
OHVCC
= 4.75V, Load = 35mA - 0.4 0.8 V
= 5.25V - - 10 µA
3
HC5520
Electrical Specifications Unless Otherwise Specified: Typical Parameters are at T
AGND = BGND = RGND = 0V, Min-Max Parameters are Over Power Supply and Operating Temperature Range. All Transmission Parameters are Specified at 600Ω 2-Wire Terminating Impedance with 0dB transmit and receive gain. (Continued)
CONDITIONS
PARAMETER
TRANSMISSION PARAMETERS - 4-WIRE TO 2-WIRE RECEIVE GAIN (Figure 10)
Absolute Receive Gain, ARG normal
reverse
TRANSMISSION PARAMETERS - 4-WIRE TO 2-WIRE FREQUENCY RESPONSE (Figure 10)
Receive Frequency Response
Relative to ARG
TRANSMISSION PARAMETERS - 4-WIRE TO 2-WIRE GAIN TRACKING (Figure 10)
Receive Gain Tracking Relative to
ARG
TRANSMISSION PARAMETERS - 4-WIRE TO 2-WIRE SIGNAL TO DISTORTION (Figure 10)
Receive Signal to Distortion and
Noise
TRANSMISSION PARAMETERS - 4-WIRE TO 2-WIRE IDLE CHANNEL NOISE (Figure 10)
Idle Channel Noise normal
TRANSMISSION PARAMETERS - 2-WIRE TO 4-WIRE TRANSMIT GAIN (Figure 11)
Absolute Transmit Gain, ATG normal
TRANSMISSION PARAMETERS - 2-WIRE TO 4-WIRE FREQUENCY RESPONSE (Figure 11)
Transmit Frequency Response
Relative to ATG
TRANSMISSION PARAMETERS - 2-WIRE TO 4-WIRE GAIN TRACKING (Figure 11)
Transmit Gain Tracking Relative to
ATG
TRANSMISSION PARAMETERS - 2-WIRE TO 4-WIRE SIGNAL TO DISTORTION (Figure 11)
Transmit Signal to Distortion and
Noise
TRANSMISSION PARAMETERS - 2-WIRE TO 4-WIRE IDLE CHANNEL NOISE (Figure 11)
Idle Channel Noise normal
TRANSMISSION PARAMETERS - 2-WIRE RETURN LOSS (Figure 12)
2-Wire Return Loss normal
TRANSMISSION PARAMETERS - 4-WIRE TO 4-WIRE INSERTION LOSS (Figure 13)
4-Wire to 4-Wire Insertion Loss normal
TRANSMISSION PARAMETERS - TRANSHYBRID BALANCE (Figure 13)
Transhybrid Balance normal
normal
reverse
normal
reverse
normal
reverse
reverse
reverse
normal
reverse
normal
reverse
normal
reverse
reverse
reverse
reverse
reverse
600Ω -48V 1020Hz
600Ω -48V 300 to 3.4kHz 0dBm -0.15 0 +0.15 dB
600Ω -48V +3 to -40dBm0
600Ω -48V +3 to -40dBm0
600Ω -48V P-Message 73 78 -
600Ω -48V 1020Hz
600Ω -48V 300 to 3.4kHz 0dBm -0.2 -0.04 +0.2 dB
600Ω -48V +3 to -40dBm0
600Ω -48V +3 to -40dBm0
600Ω -48V P Message 73 78 - dB
600Ω -48V R
600Ω -48V 1020Hz
600Ω -48V 1020Hz
BAT
OTHER
CONDITIONS
-40 to -50dBm0
-40 to -50dBm0
-40 to -50dBm0
-40 to -50dBm0
= 6490Ω
N
KZO = 15400Ω
= 25oC, VCC = +5V, VEE = -5V, V
A
FREQ/
LEVEL
0dBm
1020Hz -0.12
1020Hz 33
0dBm
1020Hz -0.12
1020Hz 33
1020Hz
0dBm
0dBm
0dBm
MIN TYP MAX UNITSMODE LOAD V
-0.2 0 +0.2 dB
0
-
-
-0.2 -0.07 +0.2 dB
-
-
30 45 - dB
-0.2 -0.02 +0.2 dB
30 38 - dB
0
38
33
0
0.02
38
33
= -48V,
BAT
+0.12-dB
dB
-
dB
-
dB
dBm0P
+0.12-dB
dB
-dB
dB
4
HC5520
Electrical Specifications Unless Otherwise Specified: Typical Parameters are at T
= 25oC, VCC = +5V, VEE = -5V, V
A
BAT
= -48V,
AGND = BGND = RGND = 0V, Min-Max Parameters are Over Power Supply and Operating Temperature Range. All Transmission Parameters are Specified at 600Ω 2-Wire Terminating Impedance with 0dB transmit and receive gain. (Continued)
CONDITIONS
PARAMETER
BAT
OTHER
CONDITIONS
FREQ/
LEVEL
MIN TYP MAX UNITSMODE LOAD V
TRANSMISSION PARAMETERS - 4-WIRE TO 4-WIRE ABSOLUTE DELAY
Absolute Delay normal
reverse
600Ω -48V 1020Hz
0dBm
1.5 µs
TRANSMISSION PARAMETERS - OVER LOAD LEVEL (Figures 14, 15)
Receive Over Load Level at 4W
and 2W
Transmit Over Load Level at 2W
and 4W
normal
reverse
normal
reverse
600Ω -42V 1% THD 1020Hz 2.5 - - V
600Ω -42V 1% THD 1020Hz 2.15 - - V
PEAK
PEAK
TRANSMISSION PARAMETERS - LONGITUDINAL IMPEDANCE (Figure 16)
Longitudinal Impedance per Wire normal
reverse
- -48V 40Hz to
100Hz
-50-
Ω
TRANSMISSION PARAMETERS - LONGITUDINAL CURRENT CAPABILITY (Figure 17)
Longitudinal Current Limit per Wire normal
reverse
- -42V Triangle
Waveform
40Hz to
100Hz
15 - - mA
PEAK
TRANSMISSION PARAMETERS - LONGITUDINAL BALANCE (Figure 18)
2-Wire Longitudinal Balance normal
reverse
4-Wire Longitudinal Balance normal
reverse
368Ω +
368Ω
368Ω +
368Ω
-48V 300Hz
1020Hz
3400Hz
-48V 300Hz
1020Hz
3400Hz
42
48
48
42
48
48
62.2
58.7
69.5
66.0
67.2
77.0
-dB
dB
dB
-dB
dB
dB
POWER SUPPLY REJECTION RATIO (Figure 19)
PSRR V
PSRR V
PSRR V
PSRR V
PSRR V
PSRR V
To 4-Wire normal
BAT
To 2-Wire normal
BAT
To 4-Wire normal
CC
To 2-Wire normal
CC
To 4-Wire normal
EE
To 2-Wire normal
EE
reverse
reverse
reverse
reverse
reverse
reverse
600Ω -48V V
600Ω -48V V
= -48V +
BAT
100mV
= -48V +
BAT
100mV
RMS
RMS
600Ω -48V VCC = 4.75V +
100mV
RMS
600Ω -48V VCC = 4.75V +
100mV
RMS
600Ω -48V VEE = -4.75V +
100mV
RMS
600Ω -48V VEE = -4.75V +
100mV
RMS
300Hz 30 42 - dBC
300Hz 30 42 - dBC
300Hz 20 33 - dBC
3420Hz 20 24 - dBC
2500Hz 20 30 - dBC
2500Hz 20 32 - dBC
5
HC5520
Circuit Operation and Design Information
The HC5520 is a current feed voltage senseSubscriberLine
Interface Circuit (SLIC). It provides extensive digitally con-
trolled supervisory functions, DC loop feed functions, and
user selectable 2 wire impedance matching functions.
Modes of Operation
The HC5520 has seven possible modes of operation. These
modes of operation are either controlled by the digital control
inputs to the SLIC or controlled by the loop status output of
the SLIC. The modes of operation and the function of the
digital control inputs are given in Table 1.
TABLE 1.
SLIC
OPERATION MODE
Normal
Loop Feed
Reverse
Loop Feed
Loop
Powerdown
Ringing Ringing Ring trip
Test out Test-out Normal TAI = Low
Test in Test-in Normal TBI = Low
Thermal
Shut Down
Normal Normal PRI = High
Reverse Normal PRI = Low
P’down Loop
TSD Loop
FUNCTION
power down
detection only
Powerdown
Normal Loop Feed Mode
When PDI = 1, setting the PRI to a logic “1” places the SLIC
in the Normal Loop Feed mode. This is the normal operational mode of the SLIC. With a nominal battery supply of 48V and an on-hook condition, the voltage at the Tip terminal will be approximately 8% of the battery supply voltage. In
this case the Tip voltage is about -3.8V. Similarly, the voltage
at the Ring terminal will be approximately 92% of the battery
supply voltage or about -44.2V.
In the Normal mode the Tip voltage is more positive than
the Ring voltage; therefore, in an off-hook condition, the DC
loop current flows from Tip to Ring. The loop feeding
characteristics will be given in the battery feed section. All of
the specifications applicable to this mode of operation are
provided in the electrical specifications portion of the
HC5520 data sheet.
Reverse Loop Feed Mode
When PDI = 1, setting the PRI to a logic “0” places the SLIC
in the Reverse Loop Feed mode. In this mode, the Ring terminal voltage is more positive than the Tip terminal voltage.
Thus, in an off-hook condition, the DC loop current flows
from Ring to Tip. The loop feeding characteristics in the
Reverse mode are the same as in the Normal mode. All of
CONTROL
INPUTS
PDI = Low
RCI = Low
the specifications applicable to this mode of operation are
provided in the electrical specifications portion of the
HC5520 data sheet.
Battery Feed
The HC5520 is designed to provide a 300Ω resistive feed
(150Ω per wire) for long loop applications. It will supply a DC
loop feed current of 18mA into an 1800Ω loop at the nominal
battery supply of -48V. At shorter loop lengths or higher battery supply voltages, the DC feed is current-limited to nominally 26mA in order to conserve power. For internal chip
power management purposes, external power sharing resistors are used to provide some of the DC loop current. This
allows a substantial amount of the power to be dissipated off
the chip, particularly in short loop applications. A typical loop
feeding characteristic for Normal and Reverse Loop Feed
Modes of operation is shown in Figure 1.
I
LOOP
30
mA
20
10
600
800 1.0K 1.2K 1.4K 1.6K 1.8K 2.0K 2.2K 2.4K
FIGURE 1. BATTERY FEED CHARACTERISTICS
R
LOOP
Loop Supervision - Switch Hook Detection
The Loop Supervision circuit operates in the Normal and
Reverse Loop Feed modes. The DC loop current is monitored and the off-hook condition is indicated when the loop
resistance is less than 2.4kΩ . When this occurs, the SHDO
output will be set to a logic low in order to signal the system
that an off-hook condition exists. If the subscriber is using a
rotary dial telephone, the system can monitor the dial pulses
through the SHDO output.
Ringing - Ring Trip Detection Mode
The ringing voltage is cadenced to a subscriber loop by
applying a logic signal to the Rci input. When a logic “0” is
received at the RCI input, the HC5520 will set the RD output
to low and thus pull current through the ring relay coil and
energize the ring relay. This causes the subscriber’s telephone to begin ringing. At this time the ringing current
through the ring ballast resistor is monitored to determine
whether an off-hook condition is present. Once the subscriber goes off-hook, the ring trip circuit will turn off the ring
relay after the next occurrence of a zero net current flow
through the ring ballast resistor. At the same time, the SHDO
output will be set to a logic low to indicate the ring trip detec-
6
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