LE79555-2FQCT

LE79555-2FQCT Datasheet

Le79555

Part	Datasheet
LE79555-2FQCT	LE79555-2FQCT (pdf)

Related Parts	Information
LE79555-2BVC	LE79555-2BVC
LE79555-4BVC	LE79555-4BVC
LE79555-2BVCT	LE79555-2BVCT
LE79555-4BVCT	LE79555-4BVCT
LE79555-2FQC	LE79555-2FQC

PDF Datasheet Preview
Le79555 Subscriber Line Interface Circuit VE580 Series - Ideal for high-density, low-power linecard applications Ringing, Standby, and Open Circuit - Low Standby power - to V battery operation - On-hook transmission - Two-wire impedance set by single external impedance - Programmable constant-current feed - Low Off-Hook Active Overhead Voltage - Programmable loop-detect threshold - Ground-start detector - Programmable ring-trip detect threshold - No V supply required - Three on-chip relay drivers and relay snubbers, one Polarity operation ORDERING INFORMATION Device Performance Grade / Package1 Le79555-2BVC Le79555-2FQC Le79555-4BVC Packing2 Tray The green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment. For delivery using a tape and reel packing system, add a "T" suffix to the OPN Ordering Part Number when placing an order. The Le79555 device, part of the Zarlink VoiceEdge family VE580 series of devices, was designed for high-density POTS applications requiring a power saving, small footprint SLIC device. The new SLIC device fulfills today's requirements for POTS linecard markets requiring a balance of highperformance cost-effective silicon components. The Le79555 device delivers economical linecard solutions by offering power and space savings to linecard designers. The on-chip switching regulator allows for power dissipation to be minimized for the entire system. Another benefit is that the device is offered in a reduced footprint package type, a 44-pin TQFP. This small footprint saves designers board space, thus increasing the density or number of lines on the board. Zarlink offers a range of compatible SLAC devices providing a complete line circuit that can be optimized for varying requirements. The SLIC device is designed to operate with a range of SLAC devices from low cost, nonprogrammable to more advanced, highly programmable options viable for a range of applications. RELATED LITERATURE - 080125 SLIC Switcher Circuit Application Note - 080725 Le79555 Switching Regulator Applications - 080753 Le58QL02/021/031 QLSLAC Data Sheet - 080754 Le58QL061/063 QLSLAC Data Sheet BLOCK DIAGRAM A TIP HPA Two Wire Interface Ring Relay Driver Relay Driver Relay Driver Ground Detector Input Decoder and Control RINGOUT RYOUT1 RYOUT2 C1 C2 C3 D1 D2 DET B RING VREG DA DB Signal Transmission Power Feed Controller Off-Hook Detector Ring-Trip Detector VTX RSN RD RDC CAS VDC L VBAT BGND Switching Regulator CHS QBAT CHCLK VCC RSVD AGND Document ID# 080686 Date Sept 19, 2007 Version 3 Distribution Public Document Le79555 Data Sheet TABLE OF CONTENTS Applications Features Description. Related Literature Block Diagram Ordering Information Product Description Block Descriptions Zarlink Semiconductor Inc. Le79555 Data Sheet PRODUCT DESCRIPTION BLOCK DESCRIPTIONS Two-Wire Interface The two-wire interface provides DC current and sends voice signals to a telephone apparatus connected to the line card with a two-wire line. The two-wire interface also receives the returning voice signals from the telephone. Ground Detector The ground detector block performs ground start and ground key detection, as well as automatically detects a ring-ground fault. Therefore, when the longitudinal current is greater than the ground key detector threshold, IGK, in either Active, Standby, or Tip Open, the DET will go low. Note that when the device is in Active or Standby, DET may be an indication of off-hook, ground fault, or both. Signal Transmission The RSN input current controls the receive current sent to the two-wire interface. The AC line voltage is sensed by differential amplifiers between the A and HPA leads, and between HPB and B leads. The outputs of these amplifiers are equal to the AC metallic components of the line voltages. The transmission circuit also contains a longitudinal feedback circuit to shunt longitudinal signals to a DC bias voltage. The longitudinal feedback does not affect metallic signals. Power Feed Controller Switching Regulator A switching regulator function is implemented on the chip with a few external components. The power feed controller generates a reference voltage which is the minimum voltage required to feed the output line amplifiers. The efficiency of the switching regulator >80% minimizes both the on-chip power dissipation and the system power dissipation. This is particularly important for short loops operating at high currents which otherwise cause high power dissipation. Input Decoder and Control Off-Hook Detector The most important loop monitoring function is off-hook detection. The two-wire interface produces a current equal in magnitude to the loop current divided by a constant, and sends it out on the RD pin. An external resistor and capacitor RD and CD connect the RD pin to ground. The value of the voltage across resistor RD is proportional to the current leaving the RD pin times the value of RD. The DET pin will show a logic Low when this voltage rises above a threshold. Zarlink Semiconductor Inc. Le79555 Data Sheet Ring-Trip Detector During the Ringing state, the DA pin is more positive than the DB pin, and the DET pin will show high to indicate the on hook. When an off hook condition occurs, the DB pin becomes more positive than the DA pin, and the DET pin will go low to indicate an off-hook. Ring Relay Driver The ring relay driver is active only in the Ringing state. Relay Driver A relay driver is activated by logic Low at either input pin, D1, or D2. D1 controls relay driver RYOUT1 D2 controls relay driver RYOUT2. Zarlink Semiconductor Inc. CONNECTION DIAGRAMS Le79555 RINGOUT VCC N/C VREG N/C BGND N/C B RING A TIP N/C DB RYOUT1 RYOUT2 L VBAT CHS QBAT CHCLK N/C D2 D1 C1 44 43 42 41 40 39 38 37 36 35 34 44-Pin TQFP 12 13 14 15 16 17 18 19 20 21 22 DA N/C RD N/C HPB N/C HPA N/C VTX N/C RSVD Data Sheet DET C3 C2 N/C N/C • In "Related Literature", added the "Introduction to the SLIC Family" application note. • Added the 32-pin PLCC information to the Ordering Information and Absolute Maximum Ratings sections and added the connection diagram. • Updated the Connection Diagram. • Updated the Pin Description table to correct inconsistencies added range for CHCLK. • In the Electrical Characteristics table: Updated the information in the Line Characteristics section on the Long Loops row and the VDC Accuracy row. Deleted the Disconnect state information in the Power Dissipation and Supply Currents sections. • In "Specifications", the following changes were made Added a column for performance grade in the Longitudinal Capability and Insertion Loss and Balance Return Signal tables. Changed test circuit reference in the Longitudinal Capability table Updated the Insertion Loss and Balance Return Signal table. In the Line Characteristics table, IL Standby state test conditions, changed the equation to RL = k. In the Line Characteristics table, added spec for Overhead Voltage. Made changes to test conditions for IL, Long Loops, Active State KDC VDC Accuracy VAB, Open Circuit voltage in the Line Characteristics table. Added value for CHCLK in Note • Removed current gain feature from the "Features" section • Updated "Related Literature" section to include the QLSLAC data sheets • In the "Ordering Information" table, added dashes before performance grades • Removed package graphic from "Ordering Information" section • Added OPNs for the QFN package in "Ordering Information" added note regarding markings on QFN packages • Edited "Block Descriptions" section • In "Connection Diagrams," added pinout diagram for 32-pin QFN package added notes regarding exposed pad and RSVD pin • In the "Pin Descriptions" table, the following edits were made: Updated the Pin Description table to correct inconsistencies Edited the description of the RSN pin Added range for CHCLK Made minor edits to RSVD description Added a sentence to the description for VDC Added a row to describe the exposed pad • In "Electrical Characteristics", "Absolute Maximum Ratings" table, the following was added Max power dissipation of W for 32-pin QFN package Thermal data for 32-pin QFN package • Added a note regarding maximum power dissipation values under the Absolute Maximum Ratings table Zarlink Semiconductor Inc. Le79555 Data Sheet • In the "Operating Ranges" table, changed the ambient temperature range to −40º to 85º C • In "Specifications," the following changes were made: "Transmission Performance" table, Overload level, edited test conditions changed Min to changed units to Vpk. "Transmission Performance" table, THD, On-hook, edited test conditions changed units to dB "Longitudinal Capability" table, Longitudinal current per pin A or B , added Note 4 to Note column "Insertion Loss and Balance Return Signal" table, Gain Accuracy, 2-to-4 and 4-to-4 wire, changed Max from to - • Made minor formatting edits to SLIC Device Decoding table • In "User-Programmable Components", the following changes were made: Edited equations for ITON and ITOFF Edited equation for ZRX and CCAS. • In "DC Feed Characteristics", edited Note 2 • In "Test Circuit Scenarios", the following changes were made Edited title of graphic "Four-to-Four-Wire Insertion Loss and Balance Return Signal" Modified Longitudinal Balance graphic Modified Two-Wire Return Loss graphic changed CT1 from 120 pF to 180 pF Modified RFI graphic Modified Le79555 test circuit graphic • Modified Application Circuit graphic • Added Note 2 to "Application Circuit" section • Updated Linecard Parts List to reflect the updated application circuit • Formatting updates made • Added green package OPNs to Ordering Information, on page 1 • Added Package Assembly, on page 7 • Added "Packing" column and Note 2 to Ordering Information, on page 1 • Updated 32QFN drawing in Physical Dimensions, on page 20 • Removed non-green OPNs, as well as all 1 and 3 dash grade options and 555-4QC and 555-4FQC Zarlink Semiconductor Inc. Le79555 • Modified Application Circuits, on page 17 • Modified Line card Parts List, on page 19 • Enhanced format of package drawings in Physical Dimensions, on page 20 • Added new headers/footers due to Zarlink purchase of Legerity on August 3, 2007 Data Sheet Zarlink Semiconductor Inc. For more information about all Zarlink products visit our Web Site at Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries collectively “Zarlink” is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink. This publication is issued to provide information only and unless agreed by Zarlink in writing may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user’s responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink’s conditions of sale which are available on request. Purchase of Zarlink’s I2C components conveys a license under the Philips I2C Patent rights to use these components in an I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL, the Zarlink Semiconductor logo and the Legerity logo and combinations thereof, VoiceEdge, VoicePort, SLAC, ISLIC, ISLAC and VoicePath are trademarks of Zarlink Semiconductor Inc. TECHNICAL DOCUMENTATION - NOT FOR RESALE

PDF Datasheet Preview

Le79555

Subscriber Line Interface Circuit VE580 Series
- Ideal for high-density, low-power linecard applications

Ringing, Standby, and Open Circuit - Low Standby power - to V battery operation - On-hook transmission - Two-wire impedance set by single external impedance - Programmable constant-current feed - Low Off-Hook Active Overhead Voltage - Programmable loop-detect threshold - Ground-start detector - Programmable ring-trip detect threshold - No V supply required - Three on-chip relay drivers and relay snubbers, one

Polarity operation
ORDERING INFORMATION

Device

Performance Grade / Package1

Le79555-2BVC

Le79555-2FQC

Le79555-4BVC

Packing2 Tray

The green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment.
For delivery using a tape and reel packing system, add a "T" suffix to the OPN Ordering Part Number when placing an order.

The Le79555 device, part of the Zarlink VoiceEdge family VE580 series of devices, was designed for high-density POTS applications requiring a power saving, small footprint SLIC device. The new SLIC device fulfills today's requirements for POTS linecard markets requiring a balance of highperformance cost-effective silicon components. The Le79555 device delivers economical linecard solutions by offering power and space savings to linecard designers. The on-chip switching regulator allows for power dissipation to be minimized for the entire system. Another benefit is that the device is offered in a reduced footprint package type, a 44-pin TQFP. This small footprint saves designers board space, thus increasing the density or number of lines on the board.

Zarlink offers a range of compatible SLAC devices providing a complete line circuit that can be optimized for varying requirements. The SLIC device is designed to operate with a range of SLAC devices from low cost, nonprogrammable to more advanced, highly programmable options viable for a range of applications.

RELATED LITERATURE
- 080125 SLIC Switcher Circuit Application Note - 080725 Le79555 Switching Regulator Applications - 080753 Le58QL02/021/031 QLSLAC Data Sheet - 080754 Le58QL061/063 QLSLAC Data Sheet

BLOCK DIAGRAM

A TIP HPA

Two Wire Interface

Ring Relay Driver Relay Driver Relay Driver

Ground Detector

Input Decoder and Control

RINGOUT

RYOUT1

RYOUT2

C1 C2 C3 D1 D2 DET

B RING

VREG DA DB

Signal Transmission

Power Feed Controller

Off-Hook Detector

Ring-Trip Detector

VTX RSN

RD RDC CAS VDC

L VBAT BGND

Switching Regulator

CHS QBAT CHCLK

VCC RSVD AGND

Document ID# 080686 Date Sept 19, 2007

Version 3

Distribution Public Document

Le79555

Data Sheet

TABLE OF CONTENTS
Applications Features Description. Related Literature Block Diagram Ordering Information Product Description Block Descriptions

Zarlink Semiconductor Inc.

Le79555

Data Sheet

PRODUCT DESCRIPTION

BLOCK DESCRIPTIONS

Two-Wire Interface

The two-wire interface provides DC current and sends voice signals to a telephone apparatus connected to the line card with a two-wire line. The two-wire interface also receives the returning voice signals from the telephone.

Ground Detector

The ground detector block performs ground start and ground key detection, as well as automatically detects a ring-ground fault. Therefore, when the longitudinal current is greater than the ground key detector threshold, IGK, in either Active, Standby, or Tip Open, the DET will go low. Note that when the device is in Active or Standby, DET may be an indication of off-hook, ground fault, or both.

Signal Transmission

The RSN input current controls the receive current sent to the two-wire interface. The AC line voltage is sensed by differential amplifiers between the A and HPA leads, and between HPB and B leads. The outputs of these amplifiers are equal to the AC metallic components of the line voltages. The transmission circuit also contains a longitudinal feedback circuit to shunt longitudinal signals to a DC bias voltage. The longitudinal feedback does not affect metallic signals.

Power Feed Controller

Switching Regulator

A switching regulator function is implemented on the chip with a few external components. The power feed controller generates a reference voltage which is the minimum voltage required to feed the output line amplifiers. The efficiency of the switching regulator >80% minimizes both the on-chip power dissipation and the system power dissipation. This is particularly important for short loops operating at high currents which otherwise cause high power dissipation.

Input Decoder and Control

Off-Hook Detector

The most important loop monitoring function is off-hook detection. The two-wire interface produces a current equal in magnitude to the loop current divided by a constant, and sends it out on the RD pin. An external resistor and capacitor RD and CD connect the RD pin to ground. The value of the voltage across resistor RD is proportional to the current leaving the RD pin times the value of RD. The DET pin will show a logic Low when this voltage rises above a threshold.

Zarlink Semiconductor Inc.

Le79555

Data Sheet

Ring-Trip Detector

During the Ringing state, the DA pin is more positive than the DB pin, and the DET pin will show high to indicate the on hook. When an off hook condition occurs, the DB pin becomes more positive than the DA pin, and the DET pin will go low to indicate an off-hook.

Ring Relay Driver

The ring relay driver is active only in the Ringing state.

Relay Driver

A relay driver is activated by logic Low at either input pin, D1, or D2. D1 controls relay driver RYOUT1 D2 controls relay driver RYOUT2.

Zarlink Semiconductor Inc.

CONNECTION DIAGRAMS

Le79555

RINGOUT VCC N/C VREG N/C BGND N/C B RING A TIP N/C DB

RYOUT1 RYOUT2

L VBAT

CHS QBAT CHCLK

N/C D2 D1 C1
44 43 42 41 40 39 38 37 36 35 34
44-Pin TQFP
12 13 14 15 16 17 18 19 20 21 22

DA N/C RD N/C HPB N/C HPA N/C VTX N/C RSVD

Data Sheet

DET C3 C2 N/C N/C
• In "Related Literature", added the "Introduction to the SLIC Family" application note.
• Added the 32-pin PLCC information to the Ordering Information and Absolute Maximum Ratings sections and added the
connection diagram.
• Updated the Connection Diagram.
• Updated the Pin Description table to correct inconsistencies added range for CHCLK.
• In the Electrical Characteristics table:

Updated the information in the Line Characteristics section on the Long Loops row and the VDC Accuracy row. Deleted the Disconnect state information in the Power Dissipation and Supply Currents sections.
• In "Specifications", the following changes were made Added a column for performance grade in the Longitudinal Capability and Insertion Loss and Balance Return Signal tables. Changed test circuit reference in the Longitudinal Capability table Updated the Insertion Loss and Balance Return Signal table. In the Line Characteristics table, IL Standby state test conditions, changed the equation to RL = k. In the Line Characteristics table, added spec for Overhead Voltage. Made changes to test conditions for IL, Long Loops, Active State KDC VDC Accuracy VAB, Open Circuit voltage in the Line Characteristics table. Added value for CHCLK in Note
• Removed current gain feature from the "Features" section
• Updated "Related Literature" section to include the QLSLAC data sheets
• In the "Ordering Information" table, added dashes before performance grades
• Removed package graphic from "Ordering Information" section
• Added OPNs for the QFN package in "Ordering Information" added note regarding markings on QFN packages
• Edited "Block Descriptions" section
• In "Connection Diagrams," added pinout diagram for 32-pin QFN package added notes regarding exposed pad and RSVD
pin
• In the "Pin Descriptions" table, the following edits were made:

Updated the Pin Description table to correct inconsistencies Edited the description of the RSN pin Added range for CHCLK Made minor edits to RSVD description Added a sentence to the description for VDC Added a row to describe the exposed pad
• In "Electrical Characteristics", "Absolute Maximum Ratings" table, the following was added Max power dissipation of W for 32-pin QFN package Thermal data for 32-pin QFN package
• Added a note regarding maximum power dissipation values under the Absolute Maximum Ratings table

Zarlink Semiconductor Inc.

Le79555

Data Sheet
• In the "Operating Ranges" table, changed the ambient temperature range to −40º to 85º C
• In "Specifications," the following changes were made:
"Transmission Performance" table, Overload level, edited test conditions changed Min to changed units to Vpk. "Transmission Performance" table, THD, On-hook, edited test conditions changed units to dB "Longitudinal Capability" table, Longitudinal current per pin A or B , added Note 4 to Note column "Insertion Loss and Balance Return Signal" table, Gain Accuracy, 2-to-4 and 4-to-4 wire, changed Max from to -
• Made minor formatting edits to SLIC Device Decoding table
• In "User-Programmable Components", the following changes were made:

Edited equations for ITON and ITOFF Edited equation for ZRX and CCAS.
• In "DC Feed Characteristics", edited Note 2
• In "Test Circuit Scenarios", the following changes were made Edited title of graphic "Four-to-Four-Wire Insertion Loss and Balance Return Signal" Modified Longitudinal Balance graphic Modified Two-Wire Return Loss graphic changed CT1 from 120 pF to 180 pF Modified RFI graphic Modified Le79555 test circuit graphic
• Modified Application Circuit graphic
• Added Note 2 to "Application Circuit" section
• Updated Linecard Parts List to reflect the updated application circuit
• Formatting updates made
• Added green package OPNs to Ordering Information, on page 1
• Added Package Assembly, on page 7
• Added "Packing" column and Note 2 to Ordering Information, on page 1
• Updated 32QFN drawing in Physical Dimensions, on page 20
• Removed non-green OPNs, as well as all 1 and 3 dash grade options and 555-4QC and 555-4FQC

Zarlink Semiconductor Inc.

Le79555
• Modified Application Circuits, on page 17
• Modified Line card Parts List, on page 19
• Enhanced format of package drawings in Physical Dimensions, on page 20
• Added new headers/footers due to Zarlink purchase of Legerity on August 3, 2007

Data Sheet

Zarlink Semiconductor Inc.

For more information about all Zarlink products visit our Web Site at

Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries collectively “Zarlink” is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink.

This publication is issued to provide information only and unless agreed by Zarlink in writing may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user’s responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink’s conditions of sale which are available on request.

Purchase of Zarlink’s I2C components conveys a license under the Philips I2C Patent rights to use these components in an I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL, the Zarlink Semiconductor logo and the Legerity logo and combinations thereof, VoiceEdge, VoicePort, SLAC, ISLIC, ISLAC and VoicePath are trademarks of Zarlink Semiconductor Inc.

TECHNICAL DOCUMENTATION - NOT FOR RESALE

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LE79555-2FQCT Datasheet file may be downloaded here without warranties.

Datasheet ID: LE79555-2FQCT 648988