The Le79R241 Intelligent Subscriber Line Interface Circuit (ISLIC?) device, in combination with an Le79228x 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 applications worldwide.

Features & Benefits

• Monitor of two-wire interface voltages and currents supports
• Voice transmission
• Internal chip ring generation
• 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
• 12 kHz and 16 kHz
• Smooth polarity reversal
• Tip-open state supports ground start signaling
• Integrated test load switches/relay drivers
• 5 REN with DC offset trapezoid.
• For US standard:
• drives ring up to 4.4 kft of 26 gauge wire.
• drives ring up to 7 kft of 24 gauge wire.
• For European (British) standard:
• drives ring up to 1.7 km of 0.5 mm copper cable.
• Space Saving Package Options (8x8 QFN)

Documentation

• Le79R241-datasheet.pdf

Errata

Design Manuals

Software Manuals

Application Notes

• Overvoltage Protection Appnote
• Type 2 Calling Identity Appnote

Product Previews

• VE790 Series Product Preview

Evaluation Boards

• Le71HE0861-862-Evaluation-Board-Users-Guide.pdf

Software URLs

• LE71SK0002: VoicePath API-II Software
• LE71SDKWIN: WinSLAC
• LE71SDKVPS: VP-Script
• LE71SDKUVB: UVB Images
• LE71SDKPRO: Profile Wizard

Typical Applications

Enables a cost effective voice solution for long or short loop applications providing POTS and integrated test capabilities

• CO
• DLC
• PBX/KTS
• Pair gain

Product Packaging & Availability

Part Number	Package Type	Pin Count	Lead-Free Option	Shipping Option(s)	Lead Time(wks)	Status
LE79R241DJC	PLCC	32	GREEN	Tube	CONTACT MICROSE	Production
LE79R241DJC	PLCC	32	GREEN	Tube	CONTACT MICROSE	Production
LE79R241DJCT	PLCC	32	GREEN	TR	12-14 weeks	Production
LE79R241DJCT	PLCC	32	GREEN	TR	12-14 weeks	Production

Packaging Information

• Soldering Profiles
• Moisture Sensitivity
• Shelf Life
• Reliability Data

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