™
Le79R101
Ringing Subscriber Line Interface Circuit
VE580 Series
APPLICATIONS
Integrated Access Device (IAD)
ORDERING INFORMATION
The table below lists the valid device configurations available.
Construct your part number as follows:
Device + Pol. + Pkg. Option
For example: Le79R101-4JC
Device
Pol.
Pkg.
Options
JC
-1
DJC
QC
Pkg.
Description
32-pin PLCC
32-pin PLCC (Green package)**
32-pin QFN (Green package)**
32-pin QFN
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
Smart Residential Gateway (SRG)
Set Top/House Side Box
Network Interface Unit (NIU)
Cable Modem
Cable PC
Fiber in the Loop (FITL)
Fiber to the Home (FTTH)
Wireless Local Loop (WLL)
Intelligent PBX
ISDN TA/NT1
FEATURES
Meets UL1950 safety requirements
Through sinusoidal ringing with DC offset
On-chip ring-trip detector
Low standby state power
Battery operation:
V
BAT1
: –15 V to –99 V
V
BAT2
: –15 V to V
BAT1
On-hook transmission
On-chip battery switching and feed selection
Two-wire impedance set by single external impedance
Programmable constant-current feed
Programmable Open Circuit voltage
Current gain = 1000
Ground-key detector
Programmable loop-detect threshold
Polarity reversal option available
Internal V
EE
regulator (no external –5 V power supply
required)
Two on-chip relay drivers and snubber circuits
Space-saving package options (8 x 8 QFN)
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Le79R101*
FQC
-2
-3
-4
JC
QC
FQC
32-pin PLCC
32-pin QFN
32-pin QFN (Green package)**
-1: 52 dB Longitudinal Balance, Polarity Reversal
-2: 63 dB Longitudinal Balance, Polarity Reversal
-3: 52 dB Longitudinal Balance, No Polarity Reversal
-4: 63 dB Longitudinal Balance, No Polarity Reversal
* 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 inven-
tory bearing this mark has been depleted. It should be noted that parts
marked with either the "Am" or the "Le" part number prefix are equiva-
lent devices in terms of form, fit, and function.
**Green Package. meets RoHS Directive 2002/95/EC of the European
Council to minimize the environmental impact of electrical equipment.
DESCRIPTION
The Le79R101 device is a bipolar monolithic Ringing SLIC
device that offers on-chip sinusoidal ringing. The sinusoidal
ringing waveform generated through the Le79R101 device has
an advantageously low distortion, and satisfies the traditional
ringing waveform requirements of small PBX, WLL, and
Pairgain applications. The Le79R101 device also offers offset
ringing and satisfies most phones that require an offset from
ring to tip during ringing.
BLOCK DIAGRAM
Relay
Driver
RTRIP1
RTRIP2
Relay
Driver
RYOUT2
RYE
RYOUT1
D1
A(TIP)
Ring-Trip
Detector
Ground-Key
Detector
Two-Wire
Interface
Off-Hook
Detector
Input Decoder
and Control
D2
C1
C2
C3
E1
DET
B(RING)
Signal
Transmission
RD
VTX
RSN
RREF
VRING
RDC
RDCR
RSGL
RSGH
HPB
T
RELATED LITERATURE
HPA
080255 Le79R79/R100/R101 SLIC Evaluation Board
User’s Guide
080149 Le79R79 Ringing SLIC User’s Guide
080158 Le79R70/79/100/101 Ringing SLIC Technical
Overview
080458 Le79R100/101 Vs. Le79R79 Device
Comparison Brief
080753 Le58QL02/021/031 QLSLAC™ Data Sheet
080754 Le58QL061/063 QLSLAC™ Data Sheet
Power-Feed
Controller
VBAT2
VBAT1
Switch
Driver
Document ID# 080280
080280
Date:
Date:
May 07, 2005
Feb 9, 2002
Rev:
E
H
Version:
1
Distribution:
Public Document
TABLE OF CONTENTS
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Related Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Transmission Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Longitudinal Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Idle Channel Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Insertion Loss and Four-to-Four-Wire Balance Return Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Line Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Power Supply Rejection Ratio, Active Normal State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Logic Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Ring Trip Detector Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Ring Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Ground-Key Detector Thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Loop Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Relay Driver Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Relay driver schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
SLIC Device Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
User-Programmable Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
DC Feed Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Ring-Trip Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Test Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Le79R101 Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Application Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Line card Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
32-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
32-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision B1 to C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision C to D1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision D1 to D2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision D2 to E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision E1 to F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision F1 to G1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision G1 to H1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
2
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Le79R101 VE580 Series Data Sheet
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PRODUCT DESCRIPTION
The Legerity family of subscriber line interface circuit (SLIC) products provide the telephone interface functions required
throughout the worldwide market. Legerity SLIC devices address all major telephony markets including central office (CO),
private branch exchange (PBX), digital loop carrier (DLC), fiber-in-the-loop (FITL), radio-in-the-loop (RITL), hybrid fiber coax
(HFC), and cable telephony applications.
The Legerity SLIC devices offer support of BORSHT (battery feed, overvoltage protection, ringing, supervision, hybrid, and test)
functions with features including current limiting, on-hook transmission, polarity reversal, Tip Open, and loop-current detection.
These features allow reduction of linecard cost by minimizing component count, conserving board space, and supporting
automated manufacturing.
The Legerity SLIC devices provide the two- to four-wire hybrid function, DC-loop feed, and two-wire supervision. Two-wire
termination is programmed by a scaled impedance network. Transhybrid balance can be achieved with an external balance
circuit or simply programmed using a companion Legerity codec, the Le58QL02/021/031/061/063 (QLSLAC™) device.
The Le79R101 device is a bipolar monolithic Ringing SLIC device that offers on-chip sinusoidal ringing. Now designers can
achieve significant cost reductions at the system level for reduced-loop applications by integrating the ringing function on chip.
Examples of such applications would be ISDN terminal adaptors, fiber-in-the-loop, radio-in-the-loop, hybrid fiber/coax and cable
telephony (home-side) boxes. The Le79R101 device can provide sufficient voltage to meet the stringent LSSGR five-ringer
equivalent specification. Using an appropriate input signal, the Le79R101 device provides a sinusoidal ringing waveform with DC
offset.
In order to further enhance the suitability of this device in short-loop, distributed switching applications, Legerity has maximized
power savings by incorporating battery switching on chip. The Le79R101 device switches between two battery supplies such that
in the off-hook (active) state, a low battery is used to save power. In order to meet the Open Circuit voltage requirements of fax
machines and maintenance termination units (MTU), the SLIC automatically switches to a higher voltage in the on-hook (standby)
state.
Like all of the Legerity SLIC devices, the Le79R101 device supports on-hook transmission, ring-trip detection, programmable
loop-detect threshold, and is available with on-chip polarity reversal. The Le79R101 device is a programmable constant-current
feed device with two on-chip relay drivers to operate external relays. Several performance grades are available to meet both
CCITT and LSSGR requirements, including various longitudinal balance options. This unique device is available in a 100-V
bipolar process in a 32-pin PLCC package.
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
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Le79R101 VE580 Series Data Sheet
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CONNECTION DIAGRAMS
Figure 1.
RYOUT2
32-Pin PLCC
B(RING)
32
VBAT2
BGND
A(TIP)
31
VCC
4
3
2
1
RD
30
29
28
27
26
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
RYE
RYOUT1
NC
VBAT1
D1
E1
C3
C2
DET
5
6
7
8
9
10
11
12
13
14
15
16
RTRIP1
RTRIP2
HPB
HPA
RINGIN
RDCR
VTX
VNEG
RSN
17
NT
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RYOUT2
B(RING)
VBAT2
VCC
BGND
A(TIP)
RYE
32
1
31
30
29
28
27
Figure 2. 32-Pin QFN
RYOUT1
2
3
4
5
6
7
8
NC
VBAT1
32-pin QFN
D1
E1
DI
SC
NO
O
C3
C2
Exposed Pad
9
10
11
12
T
DET
C1
D2
RSGH
RSGL
RREF
RDC
Note:
1.
2.
3.
Pin 1 is marked for orientation.
NC = No connect.
The thermally enhanced QFN package features an exposed pad on the underside which must be electrically tied to VBAT1.
4
Le79R101 VE580 Series Data Sheet
AGND/DGND
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24
23
22
21
18
19
20
32-Pin PLCC
25
C1
D2
RSGH
RSGL
RREF
RDC
AGND/DGND
26
RTRIP1
RD
25
24
23
RTRIP2
HPB
HPA
22
21
RINGIN
RDCR
VTX
VNEG
RSN
20
19
18
17
16
13
14
15
PIN DESCRIPTIONS
Pin Names
AGND/DGND
A(TIP)
BGND
B(RING)
Gnd
Output
Gnd
Output
Input
Input
Input
Output
Type
Analog and digital ground
Output of A (TIP) power amplifier
Battery (power) ground
Output of B(RING) power amplifier
Decoder. SLIC control pins. C3 is MSB and C1 is LSB. TTL compatible.
Relay1 Control. TTL compatible. Logic Low activates the Relay1 relay driver.
Relay2 Control. (Option) TTL compatible. Logic Low activates the Relay2 relay driver.
Switchhook Detector. When enabled, a logic Low indicates that a selected condition is detected. The
detect condition is selected by the logic inputs (C3–C1 and E1). The output is open collector with a built-
in 15 kΩ pull-up resistor.
Ground-Key Enable. (Option) A logic High selects the off-hook detector. A logic Low selects the ground-
key detector. TTL compatible.
High-Pass Filter. A(TIP) side of high-pass filter capacitor.
Description
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
C3–C1
D1
D2
DET
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
E1
HPA
HPB
RD
RDC
RDCR
RREF
RSGH
RSGL
Input
Capacitor
Capacitor
Resistor
Output
—
—
Input
Input
High-Pass Filter. B(RING) side of high-pass filter capacitor.
Detect Resistor. Detector threshold set and filter pin.
DC Feed Resistor. Connection point for the DC-feed current programming network. The other end of the
network connects to the receiver summing node (RSN). The sign of VRDC is negative for normal polarity
and positive for reverse polarity.
Connection point for feedback during ringing.
Ringing Reference. Reference voltage for VRING pin.
RSN
RTRIP1
RTRIP2
RYE
RYOUT1
RYOUT2
VBAT1
VBAT2
VCC
VNEG
Input
Input
Input
Output
Output
Output
Battery
VRING
VTX
Exposed Pad
DI
SC
NO
O
Battery
Power
Power
Input
Output
Battery
T
NT
RE
CO
IN
NE
M
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W M
D E
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Positive analog power supply
Must be electrically tied to VBAT1.
Saturation Guard High. Pin for resistor to adjust Open Circuit voltage when operating from V
BAT1
.
Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when operating from
both V
BAT1 and
V
BAT2
.
Receive Summing Node. The metallic current (both AC and DC) between A(TIP) and B(RING) is equal
to 1000 x the current into this pin. The networks that program receive gain, two-wire impedance, and feed
resistance all connect to this node.
Ring-Trip Detector. Ring-trip detector threshold set and filter pin.
Ring-Trip Detector. Ring-trip detector threshold offset (switch to V
BAT1
). For power conservation in any
nonringing state, this switch is open.
Common Emitter of RYOUT1/RYOUT2. Emitter output of RYOUT1 and RYOUT2. Normally connected to
relay ground.
Relay/Switch Driver. Open collector driver with emitter internally connected to RYE.
Relay/Switch Driver. (Option) Open collector driver with emitter internally connected to RYE.
Battery supply and connection to substrate.
Power supply to output amplifiers. Connect to off-hook battery through a diode.
Negative analog power supply. This pin is the return for the internal V
EE
regulator.
Ring Signal. Ring signal input with respect R
REF
. 1 V maximum level 10 kΩ input impedance to R
REF
.
Transmit Audio. This output is proportional to the A (TIP) and B (RING) metallic AC voltage. VTX also
sources the two-wire input impedance programming network. (See two-to-four-wire gain accuracy.)
Le79R101 VE580 Series Data Sheet
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Microcontroller MCU
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