參數(shù)資料
型號(hào)： LE79R251JC
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁數(shù)： 1/22頁
文件大?。?/td> 533K
代理商： LE79R251JC
Le79R251 ISLIC Data Sheet
Publication#
080253
Rev:
A
Version:
1.0
Date:
Sep 27, 2001
P R E L I M I N A R Y
ISLIC
Intelligent Subscriber Line Interface Circuit
Le79R251 device
APPLICATIONS
Provides a cost-effective voice solution for long loop
applications providing POTS and integrated test
capabilities.
— CO
— DLC
— PBX/KTS
— Pair Gain
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
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
–
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
— Provides the highest ringing capability in Legerity's
Intelligent Access Voice family.
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
— Maintains longitudinal balance with low tolerance fuse
resistors or PTC thermistors
Provides pulse metering
— 12 kHz and 16 kHz
— Smooth polarity reversal
Tip-open state supports ground start signaling
Integrated test load switches/relay drivers
5 REN with 20 V DC offset trapezoid.
For US standard:
— drives ring up to 16.9 kft of 26 gauge wire.
or
— 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.
ORDERING INFORMATION
An ISLAC device must be used with this part.
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.
RELATED LITERATURE
080274 Am79D2251 Dual ISLAC Data Sheet
080250 Am79Q224x Quad ISLAC Data Sheet
080345 Am79R2xx/Am79D2251 Technical Reference
080344 Am79R2xx/Am79Q224x Technical Reference
Device
Package
Le79R251JC
32-pin PLCC
BLOCK DIAGRAM
Two-Wire
Interface
BGND
VCC
GND
Signal
Transmission
Gain/Level
Shift
Longitudinal
Control
Attenuator
Thermal
Management
Control
Signal
Conditioning
Switch
Driver
Relay
Drivers
Relay Driver 1
Input
Decoder
and
Control
Registers
Relay
Control
AD
SA
BD
SB
HPB
HPA
TMN
TMP
VBL
VBH
R2
R3
RYE
R1
TMS
VBP
IMT
ILG
VREF
VSAB
VLB
VTX
RSN
CREF
LD
P3
P2
P1
Fault
Meas
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