Document ID#: 080211 Date: Sep 19, 2007
Rev: JVersion: 2
Distribution: Public Document
™
Le79R70
Ringing Subscriber Line Interface Circuit
VE580 Series
APPLICATIONS
Integrated Access Devices (IADs)
Network Interface Units (NIUs)
Cable Modems
DSL Modems
Set Top / House Side Boxes
Intelligent PBX
Pain Gain
FXS Cards
Voice over ISDN or T1/E1
Smart Residential Gateways
WLL, APON, FITL, NGN, and all other short-loop CPE/
Enterprise telephony applications
FEATURES
Ideal for ISDN-TA and set top applications
On-chip ringing with on-chip ring-trip detector
Low Standby state power
Battery operation:
— VBAT1: –40 V to –67 V
— VBAT2: –19 V to VBAT1
On-chip battery switching and feed selection
On-hook transmission
Polarity reversal option
Programmable constant-current feed
Programmable open circuit voltage
Programmable loop-detect threshold
Current gain = 1000
Two-wire impedance set by single component
Ground-key detector
Tip Open state for ground-start lines
Internal VEE regulator (no external –5 V power supply
required)
Two on-chip relay drivers and snubber circuits
Space-saving package options (8x8 QFN)
RELATED LITERATURE
080917 VE790 Series RSLIC Device Product Brief
080158 Le79R70/79/100/101 Ringing SLIC Devices
Technical Overview
080255 Le71HE0040J Evaluation Board User’s Guide
080753 Le58QL02/021/031 QLSLAC™ Data Sheet
ORDERING INFORMATION
1. Zarlink reserves the right to fulfill all orders for this device with
parts marked with the "Am" part number prefix until all inventory
bearing this mark has been depleted. Note that parts marked with
either the "Am" or the "Le" part number prefix are equivalent
devices in terms of form, fit, and function—the prefix appearing on
the topside mark is the only difference.
2. The green package meets RoHS Directive 2002/95/EC of the
European Council to minimize the environmental impact of
electrical equipment.
3. Due to size constraints, QFN devices are marked by omitting the
“Le” prefix and the performance grade dash character. For
example, Le79R70-1QC is marked 79R701QC.
4. For delivery using a tape and reel packing system, add a "T" suffix
to the OPN (Ordering Part Number) when placing an order.
Device1Package Type2, 3 Packing4
Le79R70DJC 32-pin PLCC, No Pol. Rev.
(Green package) Tube
Le79R70-1DJC 32-pin PLCC, Pol. Rev.
(Green package) Tube
Le79R70-1FQC 32-pin QFN, Pol. Rev.
(Green package) Tray
DESCRIPTION
The Le79R70 Ringing Subscriber Line Interface Circuit
(RSLIC) device is a bipolar monolithic SLIC that offers on-chip
ringing. Designers can achieve significant cost reductions at
the system level for short-loop applications by integrating the
ringing function on chip. Examples of such applications would
be ISDN Terminal Adaptors and set top boxes. Using a CMOS-
compatible input waveform and wave shaping R-C network,
the Le79R70 Ringing SLIC device can provide trapezoidal
wave ringing to meet various design requirements.
See the Le79R70 Block Diagram, on page 3.