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LE79R251JC

更新时间： 2024-09-23 23:46:07
品牌 Logo 应用领域
其他 - ETC 电信
页数 文件大小 规格书
22页 514K
描述
Telecommunication IC

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中文翻译

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LE79R251JC 数据手册

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P R E L I M I N A R Y  
ISLIC™  
Intelligent Subscriber Line Interface Circuit  
Le79R251 device  
APPLICATIONS  
ORDERING INFORMATION  
An ISLAC™ device must be used with this part.  
Device Package  
Le79R251JC 32-pin PLCC  
Provides a cost-effective voice solution for long loop  
applications providing POTS and integrated test  
capabilities.  
— CO  
— DLC  
— PBX/KTS  
— Pair Gain  
DESCRIPTION  
The Le79R251 device, in combination with an ISLAC™ device,  
implements 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  
ISLAC device. Le79R251 device has integrated self-test and  
line-test capabilities to resolve faults to the line or line circuit.  
Integrated test capability is crucial for remote applications  
where dedicated test hardware is not cost effective.  
FEATURES  
Monitor of two-wire interface voltages and currents  
supports  
— Voice transmission  
— Through chip ring generation  
— Programmable DC feed characteristics  
–
–
Independent of battery  
Current limited  
RELATED LITERATURE  
— Selectable off-hook and ground-key thresholds  
— Subscriber line diagnostics  
080274 Am79D2251 Dual ISLAC Data Sheet  
080250 Am79Q224x Quad ISLAC Data Sheet  
080345 Am79R2xx/Am79D2251 Technical Reference  
080344 Am79R2xx/Am79Q224x Technical Reference  
–
–
–
Leakage and Loop resistance  
Line capacitance and Bell  
Foreign voltage sensing  
— Power cross and fault detection  
Integrates through chip ringing  
— High voltage operation supports long loops  
BLOCK DIAGRAM  
RSN  
VTX  
Signal  
Transmission  
AD  
SA  
— Provides the highest ringing capability in Legerity's  
HPA  
HPB  
SB  
Intelligent Access Voice family.  
Two-Wire  
Interface  
Longitudinal  
Control  
Gain/Level  
Shift  
VLB  
Dual battery operation for system power saving  
— Automatic high/low battery switching  
— Intelligent thermal management  
— +5 V and battery voltages required  
Compatible with inexpensive protection networks  
Attenuator  
VSAB  
VREF  
BD  
IMT  
ILG  
Signal  
Conditioning  
TMN  
TMP  
Thermal  
Management  
Control  
CREF  
Fault  
Meas  
— Maintains longitudinal balance with low tolerance fuse  
TMS  
resistors or PTC thermistors  
VBP  
VBL  
Provides pulse metering  
— 12 kHz and 16 kHz  
— Smooth polarity reversal  
Switch  
Driver  
Tip-open state supports ground start signaling  
Integrated test load switches/relay drivers  
5 REN with 20 V DC offset trapezoid.  
For US standard:  
VBH  
R2  
Relay  
Control  
Input  
Decoder  
and  
Control  
Registers  
P1  
P2  
P3  
Relay  
Drivers  
R3  
RYE  
— drives ring up to 16.9 kft of 26 gauge wire.  
or  
R1  
Relay Driver 1  
LD  
— drives ring up to 26.8 kft of 24 gauge wire.  
For European (British) standard:  
— drives ring up to 6.5 km of 0.5 mm copper cable.  
BGND  
GND  
VCC  
Publication# 080253 Rev:  
A
Version: 1.0 Date: Sep 27, 2001  
Le79R251 ISLIC™ Data Sheet  
1234567...22

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