Le7920-2JC Legerity, Inc., Le7920-2JC Datasheet
Le7920-2JC
Manufacturer Part Number
Le7920-2JC
Description
Manufacturer
Legerity, Inc.
Datasheet
1.LE7920-2JC.pdf
(18 pages)
Specifications of Le7920-2JC
Date_code
07+
Packing_info
PLCC
Le7920
Subscriber Line Interface Circuit
The Le7920 Subscr iber Line Interfac e Circuit
implements the basic telephone line interface
DISTINCTIVE CHARACTERISTICS
I Control states: Active, Ringing, Standby,
I Low standby power (35 mW)
I –19 V to –58 V battery operation
I On-hook transmission
I Two-wire impedance set by single external
I Programmable constant-current feed
BLOCK DIAGRAM
and Disconnect
impedance
B(RING)
A(TIP)
BGND
VBAT
HPA
HPB
DA
DB
Two-Wire
Interface
TMG
Power-Feed
Transmission
Off-Hook
Detector
Controller
Signal
functions, and enables the design of low cost, high
performance, POTS line interface cards.
I Programmable loop-detect threshold
I Programmable ring-trip detect threshold
I No –5 V supply required
I Current Gain = 500
I On-chip Thermal Management (TMG) feature
I Four on-chip relay drivers and relay snubbers, 1
VCC
ringing and 3 general purpose (32 PLCC)
Ring-Trip
Detector
VBREF
Input Decoder
Ring Relay
and Control
Relay
Driver
Relay
Driver
Relay
Driver
Driver
Document ID# 080146
Rev:
Distribution:
AGND/DGND
I
Public Document
RYOUT2
RYOUT3
RYOUT1
RINGOUT
D1
D2
D3
C1
C2
VTX
RD
RDC
CAS
DET
RSN
Date:
Version: 1
Jun 18, 2002
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