Intersil Corporation HC5503 Datasheet

HC5503

Low Cost 24V SLIC For PABX/Key Systems

The Intersil HC5503 low cost SLIC is optimized for use in small Analog or mixed Analog and Digital Key Telephone Systems (KTS) or PBX products. The low component count solution and surface mount package options,enable a small desktop Key System/PBX product to be achieved. The internal power dissipationofthe end product is minimized by the low power consumption and minimal power supply voltage requirements of the HC5503.

The HC5503 integrated solution provides higher quality, higher reliability and better performance solution than a transformer, thick ﬁlm hybrid or discrete analog subscriber interface design.

The HC5503 is designed in a Dielectrically isolated bipolar technology andisinherently latch proof and doesnot require hot plug or power supply sequencing precautions.

March 1999 File Number

4344.3

Description

• Wide Operating Battery Range (-21V to -44V)

• Single Additional +5V Supply

• 25mA Short Loop Current Limit

• Ring Relay Driver

• Switch Hook and Ring Trip Detect

• Low On-Hook Power Consumption

• On-Hook Transmission

• ITU-T Longitudinal Balance Performance

• Loop Power Denial Function

• Thermal Protection

• Supports Tip, Ring or Balanced Ringing Schemes

• Low Proﬁle SO and PLCC Surface Mount Packaging

• Pin Compatible with Industry Standard HC5504B SLIC

Ordering Information

TEMP.

PART NUMBER

HC5503CM 0 to 75 28 Ld PLCC N28.45 HC5503CB 0 to 75 24 Ld SOIC M24.3

RANGE (oC) PACKAGE

PKG.

NO.

Block Diagram

BIAS

RING RELAY

DRIVER

RING TRIP

DETECTOR

2-WIRE

INTERFACE

LOOP CURRENT

THERMAL LIMIT

RFS

TIP

RING

BAT

AGND BGND

DGND

DETECTOR

Applications

• Analog Subscriber Line Interfaces in Analog Key Systems and Digital ISDN PABX Systems

• Related Literature

- AN571, Using Ring Sync with HC-5502A and HC-5504

SLICs

4-WIRE

INTERFACE VF SIGNAL

PATH

LOGIC

INTERFACE

SHD

RS RC

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

HC5503

Absolute Maximum Ratings (Note 1) Thermal Information

Maximum Continuous Supply Voltages

). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -60 to 0.5V

BAT

(VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to 15V

(VCC - V

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75V

BAT

Relay Drive Voltage (VRD). . . . . . . . . . . . . . . . . . . . . . . . -0.5 to 15V

Operating Conditions

Operating Temperature Range

HC5503 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 75oC

Relay Driver Voltage (VRD) . . . . . . . . . . . . . . . . . . . . . . . .5V to 12V

Positive Supply Voltage (VCC). . . . . . . . . . . . . . . . . . 4.75V to 5.25V

Negative Supply Voltage (V

High Level Logic Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . 2.4V

Low Level Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6V

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.

NOTES:

1. Absolute maximum ratings are limiting values, applied individually, beyond which the serviceability of the circuit may be impaired. Functional operability under any of these conditions is not necessarily implied.

2. θJA is measured with the component mounted on an evaluation PC board in free air.

) . . . . . . . . . . . . . . . . . .-22V to -26V

BAT

Thermal Resistance (Typical, Note 2) θJA (oC/W)

24 Lead SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

28 Lead PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .150oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC

(PLCC and SOIC - Lead Tips Only)

Die Characteristics

Transistor Count. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185

Diode Count. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Die Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 x 102

Substrate Potential. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Connected

Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bipolar-DI

Electrical Speciﬁcations Unless Otherwise Speciﬁed, V

= -24V, VCC = 5V, AG = BG = DG = 0V, Typical Parameters

BAT

TA = 25oC. Min-Max Parameters are Over Operating Temperature Range

PARAMETER CONDITIONS MIN TYP MAX UNITS

On Hook Power Dissipation I Off Hook Power Dissipation RL = 600Ω, I Off Hook I Off Hook I Off Hook I

VCC VCC BAT

Off Hook Loop Current RL = 400Ω, I Off Hook Loop Current RL = 400Ω, V

= 0 (Note 3), VCC = 5V - 80 100 mW

LONG

= 0 (Note 4), VCC = 5V - 180 200 mW

LONG

RL = 600Ω, I RL = 600Ω, I RL = 600Ω, I

= 0 (Note 3), TA = 0oC - - 6.0 mA

LONG

= 0 (Note 3), TA = 25oC - - 4.0 mA

LONG

= 0 (Notes 3, 4) - 19 23 mA

LONG

= 0 (Note 3) - 22.9 - mA

LONG

BAT

= -21.6V, I

LONG

= 0 (Note 3)

17.5 - - mA

TA = 25oC

Off Hook Loop Current RL = 200Ω, I

= 0 (Note 3) - 25 30 mA

LONG

Fault Currents

TIP to Ground (Note 4) - 27.5 - mA RING to Ground -70- mA TIP to RING (Note 4) - 30 - mA TIP and RING to Ground - 140 - mA

Ring Relay Drive V

IOL = 62mA - 0.2 0.5 V Ring Relay Driver Off Leakage VRD = 12V, RC = 1 = HIGH, TA = 25oC--25µA Ring Trip Detection Period RL = 600Ω,(Note 5) - 2 3 Ring Cycles Switch Hook Detection Threshold 5 - 10.5 mA Loop Current During Power Denial RL = 200Ω - ±2- mA Dial Pulse Distortion (Note 4) 0 - 0.5 ms Receive Input Impedance (Note 5) - 90 - kΩ Transmit Output Impedance (Note 5) - 10 20 Ω

HC5503

Electrical Speciﬁcations Unless Otherwise Speciﬁed, V

= -24V, VCC = 5V, AG = BG = DG = 0V, Typical Parameters

BAT

TA = 25oC. Min-Max Parameters are Over Operating Temperature Range (Continued)

PARAMETER CONDITIONS MIN TYP MAX UNITS

2-Wire Return Loss Referenced to 600Ω +2.16µF (Note 4)

SRL LO - 15.5 - dB ER

-24- dB

SRL HI -31- dB

Longitudinal Balance 1V

2-Wire Off Hook 53 58 - dB

200Hz - 3400Hz, (Note 4) IEEE Method

RMS

0oC ≤ TA≤ 75oC

2-Wire On Hook 53 58 - dB 4-Wire Off Hook at 1kHz 50 58 - dB

Insertion Loss 0dBm Input Level, Referenced 600Ω

2-Wire to 4-Wire at 3.4kHz VTR to V

VO is the Output of the Transhybrid

Amplifier - ±0.05 ±0.2 dB 4-Wire to 2-Wire at 300Hz -3.8 -4.0 -4.2 dB Frequency Response 200 - 3400Hz Referenced to Absolute Loss at 1kHz

- ±0.02 ±0.05 dB

and 0dBm Signal Level (Note 4)

Idle Channel Noise 2-Wire to 4-Wire

Idle Channel Noise 4-Wire to 2-Wire

(Note 4)

- 1 5 dBrnC

- -89 -85 dBm0p

- 1 5 dBrnC

- -89 -85 dBm0p

Absolute Delay (Note 5)

2-Wire to 4-Wire, 4-Wire to 2-Wire - - 2 µs Trans Hybrid Loss Balance Network Set Up for 600Ω Termination at

30 40 - dB

1kHz

Overload Level VCC = +5V

2-Wire to 4-Wire (On-hook) 2.5 - - V

4-Wire to 2-Wire (Off-hook, RL = 600Ω) 3.1 - - V

PEAK PEAK

Level Linearity At 1kHz, (Note 4) Referenced to 0dBm Level

2-Wire to 4-Wire, 4-Wire to 2-Wire +3 to -40dBm - - ±0.05 dB

-40 to -50dBm - - ±0.1 dB

-50 to -55dBm - - ±0.3 dB

Power Supply Rejection Ratio (Note 4)

VCC to 2-Wire 35 - - dB

30 - 60Hz, RL = 200Ω

VCC to Transmit 35 - - dB

to 2-Wire 20 - - dB

BAT

to Transmit 20 - - dB

BAT

VCC to 2-Wire 200 - 16kHz, RL = 200Ω 35 - - dB

VCC to Transmit 35 - - dB

to 2-Wire 35 - - dB

BAT

to Transmit 35 - - dB

BAT

Logic Input Current (RS, RC, PD) 0V ≤ VIN≤ 2.4V - - ±20 µA

HC5503

Electrical Speciﬁcations Unless Otherwise Speciﬁed, V

TA = 25oC. Min-Max Parameters are Over Operating Temperature Range (Continued)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Logic Inputs

Logic ‘0’ V

Logic ‘1’ V SHD Output

Logic ‘1’ V

NOTES:

3. I

LONG

4. These parameters are controlled by design or process parameters and are not directly tested. These parameters are characterized upon initial design release, upon design changes which would affect these characteristics, and at intervals to assure product quality and specification compliance.

5. Guaranteed by design, not tested.

IL IH

OL OH

= Longitudinal Current.

800µA, VCC = 5VLogic ‘0’ V

LOAD

40µA, VCC = 5V 2.7 - 5.0 V

LOAD

= -24V, VCC = 5V, AG = BG = DG = 0V, Typical Parameters

BAT

- - 0.8 V

2.0 - 5.5 V

- 0.1 0.4 V

Design Information

HC5503

Line Feed Ampliﬁers

The line feed ampliﬁers are high power operational ampliﬁers and are connected to the subscriber loop through 150Ω of feed resistance as shown in Figure 1. The feed resistors and synthesized impedance via feedback provide a 600Ω balanced load for the 2-wire to 4-wire transmission.

The tip feed ampliﬁer is conﬁgured as a unity gain noninverting buffer. A -4V bias (derived from the negative battery (V the ampliﬁer. Hence, the tip feed DC level is at -4V. The principal reason for this offset is to accommodate sourcing and sinking of longitudinal noise currents up to 15mA without saturating the ampliﬁer output and to provide sufﬁcient overhead for receive signals. The tip feed ampliﬁer also feeds the ring feed ampliﬁer, which is conﬁgured as a unity gain inverting ampliﬁer as seen from the tip feed ampliﬁer. The noninverting input to the ring feed amp is biased at a V has a noninverting gain of 2. Thus, the DC output at ring feed is:

(DC) = (4 + V

For a -24V battery, VRF = -20V. Hence, the nominal battery feed across the loop provided by the SLIC is 16V. When the subscriber goes off-hook this DC feed causes current (metallic current) to ﬂow around the loop.

) in the bias network) is applied to the input of

BAT

/2. Looking into this terminal the ampliﬁer

BAT

) Volts

BAT

RMS

The received audio signal R

is fed into the tip feed amplifier

and appears at the tip feed terminal. It is also fed through the ring feed amplifier and is inverted. Thus, a differential signal of 2V

appears between tip feed and ring feed. The RX signal

causes AC audio currents to flow around the loop which are then AC coupled to the earpiece of the telephone set.

2-Wire Impedance Matching

The HC5503 is optimized for operation with a -24V battery. Impedance matching to a 600Ω load, is achieved through the combination of the feed resistors (R negative feedback through resistor R R

and RB2 are sense resistors that detect loop current

and provide negative feedback to synthesize the remaining 300Ω required to match a 600Ω line.

The impedance looking into the tip terminal is 150Ω (R plus the synthesized impedance of the tip ampliﬁer. The synthesized tip impedance is equal to the tip feed voltage Va divided by ∆IL. (Note, the tip feed ampliﬁer is a voltage follower. Thus, the tip feed voltage is equal to the receive input voltage V

, both are labeled Va.) The synthesized

impedance of the ring terminal is calculated the same way and is the ring feed voltage divided by ∆IL. (Note, the ring feed voltage is equal in magnitude to the tip feed voltage, but opposite in phase as a result of the ring feed ampliﬁer gain.)

, RB2) and

(reference Figure 1).

)

∆I

TIP

RB1 = RB2 = RS = 150Ω

RING

NOTE: Grounded for AC analysis.

150Ω

- ∆I

TIP FEED

RING FEED

4RS∆I

(NOTE)

HC5503

FIGURE 1. IMPEDANCE MATCHING CIRCUITRY

90kΩ

+4RS∆I

BAT

(NOTE)

TO TRANSHYBRID OP-AMP

INPUT FROM CODEC

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Intersil Corporation HC5503 Datasheet

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