LE7942BDJC Legerity, Inc., LE7942BDJC Datasheet
LE7942BDJC
Manufacturer Part Number
LE7942BDJC
Description
Manufacturer
Legerity, Inc.
Datasheet
1.LE7942BDJC.pdf
(20 pages)
Specifications of LE7942BDJC
Package
PLCC-32
Date_code
08+
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Le7942B
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
BLOCK DIAGRAM
B(RING)
Programmable constant-current feed
Receive current gain = 500
Programmable loop-detect threshold
Low standby power
Performs polarity reversal
Ground-key detector
Pin for external ground-key noise filter capacitor
Test relay driver option
A(TIP)
BGND
VREG
VBAT
HPA
HPB
DA
DB
L
Two-Wire
Interface
CHS
Transmission
Power-Feed
Ground-Key
Switching
Regulator
Controller
Ring-Trip
Off-Hook
Detector
Detector
Detector
QBAT
Signal
CHCLK
Compatible with Le7942 Device
Tip Open state for ground-start lines
–19 V to –58 V battery operation
Ideal for PBX and KTS applications
On-chip switching regulator for low-power
dissipation
Can be used with or without the on-chip switching
regulator
On-hook transmission
VCC
Ring Relay Driver
Test Relay Driver
Input Decoder
and Control
VEE AGND/DGND
Document ID# 081195
Rev:
Distribution:
E
Public Document
Date:
Version: 1
15474A-001
TESTOUT
RINGOUT
C1
C2
C3
C4
E1
DET
GKFIL
RSN
RD
RDC
CAS
VTX
Mar 21, 2005
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