Le79231JC Legerity, Inc., Le79231JC Datasheet

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Le79231JC

Manufacturer Part Number
Le79231JC
Description
Manufacturer
Legerity, Inc.
Datasheet

Specifications of Le79231JC

Date_code
07+
Packing_info
PLCC

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LE79231JC
Manufacturer:
LEGERITY
Quantity:
5 143
Part Number:
LE79231JC
Manufacturer:
LEGERITY
Quantity:
20 000
APPLICATIONS
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FEATURES
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RELATED LITERATURE
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Enables a cost effective voice solution for long or short
loop applications providing POTS and integrated test
capabilities
— CO
— DLC
— PBX/KTS
— Pair Gain
Monitor of two-wire interface voltages and currents
supports
— Voice transmission
— Programmable DC feed characteristics
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
— Power cross and fault detection
Ring relay driver for 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
Metering capable
— 12 kHz and 16 kHz
— Smooth polarity reversal
Tip-open state supports ground start signaling
Integrated test load switches/relay drivers
Space Saving Package Options (8x8 QFN)
080250 Le79Q2241/2242/2243 QISLAC Data Sheet
080262 Intelligent Access™ Voice Solutions Evaluation
Board User’s Guide
080344 Le79R2xx/Le79Q224x ISLIC™/Quad ISLAC™
Technical Reference
thermistors
– Independent of battery
– Current limited
– Leakage resistance
– Loop resistance
– Line capacitance
– Bell capacitance
– Foreign voltage sensing
Am/Le79231 Data Sheet
Intelligent Subscriber Line Interface Circuit
ORDERING INFORMATION
*This product can be ordered using ordering part numbers Am79231 or
Le79231. The Am79231 ordering part number will be discontinued
after 6/30/02, at which time the product will only be available using the
Le79231 ordering part number.
**Due to size constraints, QFN devices are marked by omitting the “Le”
prefix. For example, Le79231QC is marked 79231QC.
DESCRIPTION
The Le79231 device, in combination with an 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
ISLAC device. Additionally, the Le79231 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.
BLOCK DIAGRAM
An ISLAC device must be used with this part
Am79231JC*
Le79231JC
Le79231QC**
TMN
TMP
TMS
HPA
HPB
VBH
RYE
VBL
AD
BD
SA
SB
R2
R3
R1
Device
Management
Thermal
Control
Driver 1
Drivers
Relay
Relay
Am79231*/Le79231 Device
Two-Wire
Interface
Document ID# 080248
Rev:
Distribution:
Control
Relay
Switch Driver
Input Decoder and
Control Registers
Meas.
32-pin PLCC
32-pin PLCC
32-pin QFN
Fault
Longitudinal
Package
Control
E
Public Document
ISLIC™
Transmission
Conditioning
Date:
Version: 1
Gain/Level
Attenuator
Signal
Signal
Shift
Apr 17, 2002
RSN
VTX
VLB
VSAB
VREF
IMT
ILG
CREF
P1
P2
P3
LD

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