LE79R241DJC

LE79R241DJC Datasheet

Le79R241 Intelligent Subscriber Line Interface Circuit

Part	Datasheet
LE79R241DJC	LE79R241DJC (pdf)

Related Parts	Information
LE79R241DJCT	LE79R241DJCT

PDF Datasheet Preview
Le79R241 Intelligent Subscriber Line Interface Circuit Ve790 Series Data Sheet Document ID# 080249 Version 3 May 2011 • Monitor of two-wire interface voltages and currents supports • Voice transmission • Programmable DC feed characteristics - Independent of battery - Current limited • Selectable off-hook and ground-key thresholds • Subscriber line diagnostics - Leakage resistance - Loop resistance - Line capacitance - Bell capacitance - Foreign voltage sensing • Power cross and fault detection • Supports internal short loop or external ringing • +5 V and battery supplies • Dual battery operation for system power saving • Automatic battery switching • Intelligent thermal management • Compatible with inexpensive protection networks • Accommodates low tolerance fuse resistors or PTC thermistors • Metering capable Ordering Information Device Package1,2 Packing3 Le79R241JC Le79R241DJC Le79R241QC 32 Pin PLCC Tubes 32 Pin PLCC Green Tubes 32 Pin QFN Trays Due to size constraints, QFN devices are marked by omitting the “Le” prefix. For example, Le79R241QC is marked 79R241QC. 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. • Enables a cost effective voice solution for long or short loop applications providing POTS and integrated test capabilities • CO • DLC • PBX/KTS • Pair Gain The Le79R241 Intelligent Subscriber Line Interface Circuit ISLIC device, in combination with a VE790 series ISLAC device, implements the telephone line interface function. This enables the design of a low cost, high performance, fully software programmable line interface for multiple country applications worldwide. All AC, DC, and signaling parameters are fully programmable via microprocessor or GCI interfaces on the VE790 series ISLAC device. Additionally, the Le79R241 ISLIC device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. The integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective. Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2007-2011, Zarlink Semiconductor Inc. All Rights Reserved. Le79R241 Related Literature • 080248 Le79231 ISLIC Device Data Sheet • 080253 Le79R251 ISLIC Device Data Sheet • 080250 Le79Q224x Quad ISLAC Device Data Sheet • 081065 Le79228 Quad ISLAC Device Data Sheet • 080262 VE790 Series Evaluation Board User’s Guide • 080804 Le79R2xx/Le79Q224x Chip Set User’s Guide • 080923 Le79R2xx/Le79228 Chip Set User’s Guide • 081103 Le79610 PacketSLAC Device Data Sheet Below are the changes from the September 2007 version to the May 2011 version. Item Ordering Information Description Obsoleted Le79R241FQC package. Data Sheet Zarlink Semiconductor Inc. Le79R241 Data Sheet Table of Contents Product Description. 5 Features of the VE790 Series Chipset 9 Connection Diagrams 11 Pin Descriptions. 12 Electrical Characteristics 14 Absolute Maximum Ratings. 14 Thermal Resistance. 15 Package Assembly. 15 Operating Ranges 15 Environmental Ranges. 15 Electrical Ranges 15 Specifications. 16 Power Dissipation 16 DC Specifications 17 Relay Driver Specifications 18 Transmission Specifications 19 Ringing Specifications 20 Current-Limit Behavior. 20 Thermal Shutdown Fault Indications 20 Operating Modes 21 Operating Mode Descriptions 22 Driver Descriptions 22 Thermal-Management Equations 23 Timing Specifications 23 Waveforms 24 Application Circuit 25 Internal Ringing Line Schematic 25 Line Card Parts List - Internal Ringing. 26 External Ringing Line Schematic. 27 Line card Parts List - External Ringing 28 Physical Dimensions 29 32-Pin PLCC 29 32-Pin QFN 30 Zarlink Semiconductor Inc. Le79R241 Data Sheet List of Figures Figure 1 - Block Diagram 7 Figure 2 - Le79R241 ISLIC Device Internal Block Diagram. 8 Figure 3 - Chip Set Block Diagram - Four Channel Line Card Example 10 Figure 4 - Le79241DJC 11 Figure 5 - Le79R241QC. 11 Figure 6 - Relay Drivers 18 Zarlink Semiconductor Inc. Le79R241 Data Sheet Product Description Zarlink’s VE790 series voice chip sets integrate all functions of the subscriber line. Two chip types are used to implement the line card the Le79R241 ISLIC device and a VE790 series ISLAC device. These provide the following basic functions: The Le79R241 ISLIC device A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and senses line conditions. The VE790 series ISLAC devices Low voltage CMOS ICs that provide conversion, control and DSP functions for the Le79R241 ISLIC device. A complete schematic of the line card using a VoiceEdge chip set for internal and external ringing is shown in “Application Circuit” on page The Le79R241 ISLIC device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines. It can be programmed by the VE790 series ISLAC device to operate in eight different modes that control power consumption and signaling. This enables it to have full control over the subscriber loop. The Le79R241 ISLIC device is designed to be used exclusively with the VE790 series ISLAC devices. The Le79R241 ISLIC device requires only +5 V power and the battery supplies for its operation. The Le79R241 ISLIC device implements a linear loop-current feeding method with the enhancement of intelligent thermal management. This limits the amount of power dissipated on the Le79R241 ISLIC device by dissipating power in external resistors in a controlled manner. Each codec contains high-performance circuits that provide A/D and D/A conversion for the voice codec , DC-feed and supervision signals. The VE790 series ISLAC devices contain a DSP core that handles signaling, DC-feed, supervision and line diagnostics for all channels. The DSP core selectively interfaces with three types of backplanes: • Standard PCM/MPI • Standard GCI • Modified GCI with a single analog line per GCI channel The 790 series voice chip set provides a complete software configurable solution to the BORSCHT functions as well as complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In addition, these chip sets provide system level solutions for the loop supervisory functions and metering. In total, they provide a programmable solution that can satisfy worldwide line card requirements by software configuration.

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Le79R241 Intelligent Subscriber Line Interface Circuit

Ve790 Series Data Sheet

Document ID# 080249

Version 3

May 2011
• Monitor of two-wire interface voltages and currents supports
• Voice transmission
• Programmable DC feed characteristics - Independent of battery - Current limited
• Selectable off-hook and ground-key thresholds
• Subscriber line diagnostics - Leakage resistance - Loop resistance - Line capacitance - Bell capacitance - Foreign voltage sensing
• Power cross and fault detection
• Supports internal short loop or external ringing
• +5 V and battery supplies
• Dual battery operation for system power saving
• Automatic battery switching
• Intelligent thermal management
• Compatible with inexpensive protection networks
• Accommodates low tolerance fuse resistors or

PTC thermistors
• Metering capable
Ordering Information

Device

Package1,2

Packing3

Le79R241JC Le79R241DJC Le79R241QC
32 Pin PLCC

Tubes
32 Pin PLCC Green Tubes
32 Pin QFN

Trays

Due to size constraints, QFN devices are marked by omitting the “Le” prefix. For example, Le79R241QC is marked 79R241QC.

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.
• Enables a cost effective voice solution for long or short loop applications providing POTS and integrated test capabilities
• CO
• DLC
• PBX/KTS
• Pair Gain

The Le79R241 Intelligent Subscriber Line Interface Circuit ISLIC device, in combination with a VE790 series ISLAC device, implements the telephone line interface function. This enables the design of a low cost, high performance, fully software programmable line interface for multiple country applications worldwide. All AC, DC, and signaling parameters are fully programmable via microprocessor or GCI interfaces on the VE790 series ISLAC device. Additionally, the Le79R241 ISLIC device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. The integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective.

Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.

Copyright 2007-2011, Zarlink Semiconductor Inc. All Rights Reserved.

Le79R241

Related Literature
• 080248 Le79231 ISLIC Device Data Sheet
• 080253 Le79R251 ISLIC Device Data Sheet
• 080250 Le79Q224x Quad ISLAC Device Data Sheet
• 081065 Le79228 Quad ISLAC Device Data Sheet
• 080262 VE790 Series Evaluation Board User’s Guide
• 080804 Le79R2xx/Le79Q224x Chip Set User’s Guide
• 080923 Le79R2xx/Le79228 Chip Set User’s Guide
• 081103 Le79610 PacketSLAC Device Data Sheet

Below are the changes from the September 2007 version to the May 2011 version.
Item Ordering Information

Description Obsoleted Le79R241FQC package.

Data Sheet

Zarlink Semiconductor Inc.

Le79R241

Data Sheet

Table of Contents

Product Description. 5

Features of the VE790 Series Chipset 9

Connection Diagrams 11

Pin Descriptions. 12

Electrical Characteristics 14 Absolute Maximum Ratings. 14 Thermal Resistance. 15 Package Assembly. 15 Operating Ranges 15 Environmental Ranges. 15 Electrical Ranges 15

Specifications. 16 Power Dissipation 16 DC Specifications 17 Relay Driver Specifications 18 Transmission Specifications 19 Ringing Specifications 20 Current-Limit Behavior. 20 Thermal Shutdown Fault Indications 20

Operating Modes 21 Operating Mode Descriptions 22 Driver Descriptions 22 Thermal-Management Equations 23

Timing Specifications 23

Waveforms 24

Application Circuit 25 Internal Ringing Line Schematic 25

Line Card Parts List - Internal Ringing. 26 External Ringing Line Schematic. 27

Line card Parts List - External Ringing 28

Physical Dimensions 29 32-Pin PLCC 29 32-Pin QFN 30

Zarlink Semiconductor Inc.

Le79R241

Data Sheet

List of Figures

Figure 1 - Block Diagram 7 Figure 2 - Le79R241 ISLIC Device Internal Block Diagram. 8 Figure 3 - Chip Set Block Diagram - Four Channel Line Card Example 10 Figure 4 - Le79241DJC 11 Figure 5 - Le79R241QC. 11 Figure 6 - Relay Drivers 18

Zarlink Semiconductor Inc.

Le79R241

Data Sheet

Product Description

Zarlink’s VE790 series voice chip sets integrate all functions of the subscriber line. Two chip types are used to implement the line card the Le79R241 ISLIC device and a VE790 series ISLAC device. These provide the following basic functions:

The Le79R241 ISLIC device A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and senses line conditions.

The VE790 series ISLAC devices Low voltage CMOS ICs that provide conversion, control and DSP functions for the Le79R241 ISLIC device.

A complete schematic of the line card using a VoiceEdge chip set for internal and external ringing is shown in “Application Circuit” on page

The Le79R241 ISLIC device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines. It can be programmed by the VE790 series ISLAC device to operate in eight different modes that control power consumption and signaling. This enables it to have full control over the subscriber loop. The Le79R241 ISLIC device is designed to be used exclusively with the VE790 series ISLAC devices. The Le79R241 ISLIC device requires only +5 V power and the battery supplies for its operation.

The Le79R241 ISLIC device implements a linear loop-current feeding method with the enhancement of intelligent thermal management. This limits the amount of power dissipated on the Le79R241 ISLIC device by dissipating power in external resistors in a controlled manner.

Each codec contains high-performance circuits that provide A/D and D/A conversion for the voice codec , DC-feed and supervision signals. The VE790 series ISLAC devices contain a DSP core that handles signaling, DC-feed, supervision and line diagnostics for all channels.

The DSP core selectively interfaces with three types of backplanes:
• Standard PCM/MPI
• Standard GCI
• Modified GCI with a single analog line per GCI channel

The 790 series voice chip set provides a complete software configurable solution to the BORSCHT functions as well as complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In addition, these chip sets provide system level solutions for the loop supervisory functions and metering. In total, they provide a programmable solution that can satisfy worldwide line card requirements by software configuration.

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 LE79R241DJC Datasheet file may be downloaded here without warranties.

Datasheet ID: LE79R241DJC 648989