™
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
ORDERING INFORMATION
Device1
Package Type2, 3
Packing5
Le79R70JC
32-pin PLCC, No Pol. Rev. Tube
32-pin PLCC, No Pol. Rev.
Le79R70DJC
Le79R70-1JC
Le79R70-1DJC
Tube
(Green package)
32-pin PLCC, Pol. Rev.
32-pin PLCC, Pol. Rev.
(Green package)
Tube
Tube
Le79R70QC
Le79R70-1QC
32-pin QFN, No Pol. Rev.
32-pin QFN, Pol. Rev.
Tray
Tray
32-pin QFN, Pol. Rev.
(Green package)
Le79R70-1FQC
Tray
1. Legerity reserves the right to fulfill all orders for this device with
parts marked with the "Am" part number prefix, until such time as
all inventory bearing this mark has been depleted. It should be
noted that parts marked with either the "Am" or the "Le" part
number prefix are equivalent devices in terms of form, fit, and
function. The only difference between the two is in the part
number prefix appearing on the topside mark.
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
2. Green package meets RoHS Directive 2002/95/EC of the
European Council to minimize the environmental impact of
electrical equipment.
Battery operation:
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.
— VBAT1: –40 V to –67 V
— VBAT2: –19 V to VBAT1
On-chip battery switching and feed selection
On-hook transmission
Polarity reversal option
4. Not available for new customers.
5. For delivery using a tape and reel packing system, add a "T" suffix
to the OPN (Ordering Part Number) when placing an order.
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
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.
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)
See the Le79R70 Block Diagram, on page 3.
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
Document ID#: 080211 Date:
Dec 6, 2005
1
Rev:
I
Version:
Distribution:
Public Document