™
Le79R241
Intelligent Subscriber Line Interface Circuit
VE790 Series
APPLICATIONS
ORDERING INFORMATION
Enables a cost effective voice solution for long or short
loop applications providing POTS and integrated test
capabilities
A VE790 series ISLAC™ device must be used with this part.
Device
Package Type1, 2
Packing3
Le79R241JC
Le79R241DJC
Le79R241QC
Le79R241FQC
32-pin PLCC
32-pin PLCC (Green)
32-pin QFN
Tube
— CO
— DLC
— PBX/KTS
— Pair gain
Tray
32-pin QFN (Green)
1. Due to size constraints, QFN devices are marked by omitting the
“Le” prefix and the performance grade dash character. For
example, Le79R241QC is marked 79R241QC.
FEATURES
Monitor of two-wire interface voltages and currents
2. The green package meets RoHS Directive 2002/95/EC of the
European Council to minimize the environmental impact of
electrical equipment.
supports
— Voice transmission
— Internal chip ring generation
— Programmable DC feed characteristics
3. For delivery using a tape and reel packing system, add a "T" suffix
to the OPN (Ordering Part Number) when placing an order.
–
Independent of battery
DESCRIPTION
–
Current limited
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.
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
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–
–
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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
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
— 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)
Document ID# 080249 Date:
Rev: Version:
Distribution: Public Document
Sep 19, 2007
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