LE79555-2BVC Legerity, Inc., LE79555-2BVC Datasheet
LE79555-2BVC
Manufacturer Part Number
LE79555-2BVC
Description
Manufacturer
Legerity, Inc.
Datasheet
1.LE79555-2BVC.pdf
(25 pages)
Specifications of LE79555-2BVC
Date_code
06
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APPLICATIONS
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FEATURES
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RELATED LITERATURE
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ORDERING INFORMATION
*Note:
Due to size constraints, QFN devices are marked by omitting the “Le”
prefix and the performance grade dash character. For example,
Le79555-2QC is marked 795552QC.
Le79555-1VC
Le79555-1QC*
Le79555-2VC
Le79555-2QC*
Le79555-3VC
Le79555-3QC*
Le79555-4VC
Le79555-4QC*
Ideal for high-density, low-power linecard applications
Control states: Active, Reverse Polarity, Tip Open,
Ringing, Standby, and Open Circuit
Low standby power
–40 to –58 V battery operation
On-hook transmission
Two-wire impedance set by single external impedance
Programmable constant-current feed
Low Off-Hook Active Overhead Voltage
Programmable loop-detect threshold
Ground-start detector
Programmable ring-trip detect threshold
No –5 V supply required
Three on-chip relay drivers and relay snubbers, one
ringing and two general purpose
Tip Open state for ground-start lines
On-chip switching regulator for Low power dissipation
Supports 30 mA for Active Normal and Reverse
Polarity operation.
080284 Introduction to the SLIC Product Family
080125 SLIC Switcher Circuit Application Note
080725 Le79555 Switching Regulator Applications
Update
080753 Le58QL02/021/031 QLSLAC Data Sheet
080754 Le58QL061/063 QLSLAC Data Sheet
Evaluation Board Schematic available upon request
Device
52 dB Pol. Rev., 44-pin TQFP
52 dB Pol. Rev., 32-pin QFN
63 dB Pol. Rev., 44-pin TQFP
63 dB Pol. Rev., 32-pin QFN
52 dB No Pol. Rev., 44-pin TQFP
52 dB No Pol. Rev., 32-pin QFN
63 dB No Pol. Rev., 44-pin TQFP
63 dB No Pol. Rev., 32-pin QFN
Performance Grade/Package
Le79555 Data Sheet
DESCRIPTION
The Le79555 device was designed for high-density POTS
applications requiring a power saving, small footprint SLIC
device. The new SLIC device fulfills today's requirements for
POTS linecard markets that require a balance of high-
performance and cost-effective silicon components. The
Le79555 device delivers economical linecard solutions by
offering power and space savings to linecard designers. The
on-chip switching regulator allows for power dissipation to be
minimized for the entire system. Another benefit is that the
device is offered in a reduced footprint package type, a 44-pin
TQFP. This small footprint allows designers to save board
space, thus increasing the density or number of lines on the
board.
Legerity offers a range of compatible SLAC devices providing
a complete line circuit that can be optimized for varying
requirements. The SLIC device is designed to operate with a
range of SLAC devices from low cost, non-programmable to
more advanced, highly programmable options viable for a
range of applications.
BLOCK DIAGRAM
B(RING)
A(TIP)
BGND
VREG
VBAT
HPA
HPB
DA
DB
L
Subscriber Line Interface Circuit
Two Wire
Interface
Switching Regulator
Document ID# 080686
Rev:
Distribution:
Transmission
Detector
Power Feed
Ground
Controller
Signal
C
Public Document
Ring Relay Driver
Le79555 Device
Input Decoder
Relay Driver
Relay Driver
and Control
Ring-Trip
Detector
Off-Hook
Detector
Date:
Version: 1.0
SLIC
Mar 25, 2002
RINGOUT
RYOUT1
RYOUT2
C1
C2
C3
D1
D2
DET
VTX
RSN
RD
RDC
CAS
VDC
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