LE79489-2JC Legerity, Inc., LE79489-2JC Datasheet

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LE79489-2JC

Manufacturer Part Number

LE79489-2JC

Description

Manufacturer

Legerity, Inc.

Datasheet

1.LE79489-2JC.pdf (19 pages)

Specifications of LE79489-2JC

Case

PLCC

Date_code

01+

Current page: 1 of 19
Download datasheet (345Kb)

Le79489

Subscriber Line Interface Circuit

DISTINCTIVE CHARACTERISTICS

I Ideal for low power sensitive applications

I Low standby power (normal and reverse)

I Automatic on-chip battery switching

I On-chip thermal management

I On-chip thermal shutdown

I –20 V to –60 V battery operation

I Programmable current limit

I Programmable resistive feed

I Programmable loop-detect threshold

BLOCK DIAGRAM

B(RING)

VBAT2

VBAT1

A(TIP)

BGND

HPB

HPA

DA

DB

TMG

Two-Wire

Interface

BSWOUT

Switch Control

BSWEN

BSWTH

Loop Detector

Transmission

Comparator

Ground-Key

Power-Feed

Ring-Trip

Controller

Detector

Signal

I Selectable overhead for metering applications

I Two-wire impedance set by single external

I On-chip ring and test relay drivers and relay

I Polarity reversal (full transmission)

I Loop and ground-key detector

I Comparator for ring-trip detection

I Ground-start capability

I On-hook transmission

impedance

snubber circuits

VCC

Ring Relay

Test Relay

Decoder

Document ID# 080201

Rev:

Distribution:

Control

Driver

Driver

Input

AGND/DGND

and

F

Public Document

TESTOUT

RINGOUT

C1

C2

C3

C4

E1

DET

RD

VTX

RSN

RDC

CAS

OVH

RFA

Date:

Version: 1

Jun 18, 2002

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