™
Le79555
Subscriber Line Interface Circuit
VE580 Series
APPLICATIONS
DESCRIPTION
The Le79555 device, part of Legerity’s VoiceEdge™ family
VE580 series of devices, 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 requiring a balance of high-
performance 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 saves designers board space, thus
increasing the density or number of lines on the board.
Ideal for high-density, low-power linecard applications
FEATURES
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
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.
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, Norma,l and Reverse
Polarity operation
RELATED LITERATURE
080125 SLIC Switcher Circuit Application Note
080725 Le79555 Switching Regulator Applications
080753 Le58QL02/021/031 QLSLAC™ Data Sheet
080754 Le58QL061/063 QLSLAC™ Data Sheet
ORDERING INFORMATION
Standard Packages
Device
Performance Grade/Package
Packing2
BLOCK DIAGRAM
Le79555-1VC
Le79555-1QC
52 dB Pol. Rev., 44-pin TQFP
52 dB Pol. Rev., 32-pin QFN
Tray
Ring Relay Driver
Relay Driver
RINGOUT
RYOUT1
RYOUT2
Le79555-2VC
Le79555-2QC
63 dB Pol. Rev., 44-pin TQFP
63 dB Pol. Rev., 32-pin QFN
Tray
Tray
Tray
A(TIP)
Le79555-3VC
Le79555-3QC
52 dB No Pol. Rev., 44-pin TQFP
52 dB No Pol. Rev., 32-pin QFN
Relay Driver
Le79555-4VC
Le79555-4QC
63 dB No Pol. Rev., 44-pin TQFP
63 dB No Pol. Rev., 32-pin QFN
HPA
C1
C2
C3
Green Packages1
D1
D2
Input Decoder
and Control
Device
Le79555-1BVC
Le79555-1FQC 52 dB Pol. Rev., 32-pin QFN
Performance Grade/Package
52 dB Pol. Rev., 44-pin TQFP
Packing2
HPB
DET
Two Wire
Interface
Ground
Detector
Tray
VTX
RSN
Signal
Transmission
Le79555-2BVC
Le79555-2FQC 63 dB Pol. Rev., 32-pin QFN
Le79555-3BVC 52 dB No Pol. Rev., 44-pin TQFP
Le79555-3FQC 52 dB No Pol. Rev., 32-pin QFN
Le79555-4BVC 63 dB No Pol. Rev., 44-pin TQFP
Le79555-4FQC 63 dB No Pol. Rev., 32-pin QFN
63 dB Pol. Rev., 44-pin TQFP
Tray
Tray
Tray
B(RING)
Off-Hook
Detector
RD
RDC
CAS
VDC
Power Feed
Controller
VREG
DA
Ring-Trip
Detector
DB
1. The green package meets RoHS Directive 2002/95/EC of the
European Council to minimize the environmental impact of
electrical equipment.
L
VBAT
BGND
Switching Regulator
2. For delivery using a tape and reel packing system, add a "T" suffix
to the OPN (Ordering Part Number) when placing an order.
Document ID# 080686 Date:
Aug 29, 2005
1
Rev:
E
Version:
Distribution:
Public Document
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