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

TXT

TA TB

TSDO

SHDO

PRI PDI RCI

TBI TAI

AGND BGND RGND

BAT

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright

TEST CONTROL

LOGIC

BIAS

BATTERY

REFERENCE

4-WIRE INTERFACE / Z

HC5520

MANAGEMENT

X4W

INTERFACE

2-WIRE

RING

CONTROL

POWER

TIP TIPSEN RINGSEN RING

RD R

RTD

PSB

PSR

PST

PSG

File Number 4148.2

HC5520

Absolute Maximum Ratings (Note 1) Thermal Information

VCC to AGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V

VEE to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7V

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

Electrical Speciﬁcations Unless Otherwise Speciﬁed: Typical Parameters are at T

= 25oC, VCC = +5V, VEE = -5V, V

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)

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

-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

0.0

mA mA mA

THERMAL SHUTDOWN

Thermal Shutdown Temperature, Die Temperature

normal

reverse

-48V - 150 -

BATTERY FEED CHARACTERISTICS - 2W VOLTAGES (Figure 4)

TIP

normal

reverse

Open -48V -5.50

-46.00

-4.16

-43.60

-2.46

-42.00VV

HC5520

Electrical Speciﬁcations Unless Otherwise Speciﬁed: Typical Parameters are at T

= 25oC, VCC = +5V, VEE = -5V, V

BAT

= -48V,

CONDITIONS

RING

TIP

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

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

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

reverse

Polarity Reversal Time reverse

1800Ω -42V - 0.04 10 ms

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

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

-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

HC5520

Electrical Speciﬁcations Unless Otherwise Speciﬁed: Typical Parameters are at T

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

normal

reverse

normal

reverse

normal

reverse

600Ω -48V 1020Hz

600Ω -48V 300 to 3.4kHz 0dBm -0.15 0 +0.15 dB

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 P Message 73 78 - dB

600Ω -48V R

600Ω -48V 1020Hz

BAT

OTHER

CONDITIONS

-40 to -50dBm0

= 6490Ω

KZO = 15400Ω

= 25oC, VCC = +5V, VEE = -5V, V

FREQ/

LEVEL

0dBm

1020Hz -0.12

1020Hz 33

0dBm

1020Hz -0.12

1020Hz 33

1020Hz

0dBm

MIN TYP MAX UNITSMODE LOAD V

-0.2 0 +0.2 dB

-0.2 -0.07 +0.2 dB

30 45 - dB

-0.2 -0.02 +0.2 dB

30 38 - dB

38 33

0.02

38 33

= -48V,

BAT

+0.12-dB

dBm0P

+0.12-dB

-dB dB

HC5520

Electrical Speciﬁcations Unless Otherwise Speciﬁed: Typical Parameters are at T

= 25oC, VCC = +5V, VEE = -5V, V

BAT

= -48V,

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

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

42 48 48

62.2

58.7

69.5

66.0

67.2

77.0

-dB dB dB

POWER SUPPLY REJECTION RATIO (Figure 19)

PSRR V

To 4-Wire normal

BAT

To 2-Wire normal

BAT

To 4-Wire normal

To 2-Wire normal

To 4-Wire normal

To 2-Wire normal

reverse

600Ω -48V V

= -48V +

BAT

100mV

= -48V +

BAT

100mV

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 20 33 - dBC

3420Hz 20 24 - dBC

2500Hz 20 30 - dBC

2500Hz 20 32 - dBC

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.

LOOP

600

800 1.0K 1.2K 1.4K 1.6K 1.8K 2.0K 2.2K 2.4K

FIGURE 1. BATTERY FEED CHARACTERISTICS

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-

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