™
Subscriber Line Interface Circuit
VE580 Series
APPLICATIONS
Ideal for high-density, low-power linecard applications
Le79555
DESCRIPTION
The Le79555 device, part of the
Zarlink
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.
Zarlink
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.
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
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
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
Device
Le79555-2BVC
Le79555-2FQC
Le79555-4BVC
1.
Performance Grade / Package
1
63 dB Pol. Rev.,
44-pin TQFP (Green)
63 dB Pol. Rev.,
32-pin QFN (with exposed pad)
(Green)
63 dB No Pol. Rev.,
44-pin TQFP (Green)
Tray
Packing
2
BLOCK DIAGRAM
Ring Relay Driver
RINGOUT
A(TIP)
Relay Driver
RYOUT1
Relay Driver
HPA
RYOUT2
The green package meets RoHS Directive 2002/95/EC of the
European Council to minimize the environmental impact of
electrical equipment.
For delivery using a tape and reel packing system, add a "T" suffix
to the OPN (Ordering Part Number) when placing an order.
C1
C2
C3
Input Decoder
and Control
Two Wire
Interface
D1
D2
DET
Ground
Detector
2.
HPB
Signal
Transmission
B(RING)
Off-Hook
Detector
VTX
RSN
RD
Power Feed
Controller
VREG
DA
DB
Ring-Trip
Detector
RDC
CAS
VDC
L
Switching Regulator
VBAT
BGND
CHCLK
Document ID#
080686
Date:
Rev:
G
Version:
Distribution:
Public Document
AGND
QBAT
RSVD
CHS
VCC
Sept 19, 2007
3
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
