ETC LE79R251JC

P R E L I M I N A R Y
ISLIC™
Intelligent Subscriber Line Interface Circuit
Le79R251 device
APPLICATIONS
ORDERING INFORMATION
Provides a cost-effective voice solution for long loop
applications providing POTS and integrated test
capabilities.
—
—
—
—
CO
DLC
PBX/KTS
Pair Gain
Monitor of two-wire interface voltages and currents
supports
— Voice transmission
— Through chip ring generation
— Programmable DC feed characteristics
– Independent of battery
– Current limited
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
– Leakage and Loop resistance
– Line capacitance and Bell
– Foreign voltage sensing
— Power cross and fault detection
Integrates through chip ringing
— High voltage operation supports long loops
— Provides the highest ringing capability in Legerity's
Intelligent Access Voice family.
Dual battery operation for system power saving
— Automatic high/low battery switching
— Intelligent thermal management
— +5 V and battery voltages required
Compatible with inexpensive protection networks
— Maintains longitudinal balance with low tolerance fuse
resistors or PTC thermistors
Provides pulse metering
Device
Package
Le79R251JC
32-pin PLCC
DESCRIPTION
FEATURES
An ISLAC™ device must be used with this part.
— 12 kHz and 16 kHz
— Smooth polarity reversal
Tip-open state supports ground start signaling
Integrated test load switches/relay drivers
5 REN with 20 V DC offset trapezoid.
The Le79R251 device, in combination with an ISLAC™ device,
implements telephone line interface function. This enables the
design of a low cost, high performance, fully software
programmable line interface for multiple country applications
worldwide. All AC, DC, and signaling parameters are fully
programmable via microprocessor or GCI interfaces on the
ISLAC device. Le79R251 device has integrated self-test and
line-test capabilities to resolve faults to the line or line circuit.
Integrated test capability is crucial for remote applications
where dedicated test hardware is not cost effective.
RELATED LITERATURE
080274 Am79D2251 Dual ISLAC Data Sheet
080250 Am79Q224x Quad ISLAC Data Sheet
080345 Am79R2xx/Am79D2251 Technical Reference
080344 Am79R2xx/Am79Q224x Technical Reference
BLOCK DIAGRAM
SA
HPA
Two-Wire
Interface
HPB
Longitudinal
Control
SB
RSN
VTX
Gain/Level
Shift
VLB
Attenuator
VSAB
BD
VREF
Signal
Conditioning
TMN
TMP
Thermal
Management
Control
IMT
ILG
CREF
Fault
Meas
TMS
VBP
VBL
Switch
Driver
VBH
Relay
Control
R2
R3
For US standard:
— drives ring up to 16.9 kft of 26 gauge wire.
or
— drives ring up to 26.8 kft of 24 gauge wire.
For European (British) standard:
— drives ring up to 6.5 km of 0.5 mm copper cable.
Signal
Transmission
AD
Input
Decoder
and
Control
Registers
Relay
Drivers
RYE
R1
P1
P2
P3
Relay Driver 1
BGND
LD
GND
VCC
Publication# 080253 Rev: A
Version: 1.0
Date: Sep 27, 2001
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
Table of Contents
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
ORDERING INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
RELATED LITERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
LE79R251 DEVICE INTERNAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
FEATURES OF THE INTELLIGENT ACCESS™ CHIPSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
CHIPSET BLOCK DIAGRAM - FOUR CHANNEL LINE CARD EXAMPLE . . . . . . . . . . . . . . . . . . . . . .6
CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
THERMAL RESISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
ELECTRICAL OPERATING RANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
POWER DISSIPATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
DC SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
RELAY DRIVER SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
TRANSMISSION SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
RINGING SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
CURRENT-LIMIT BEHAVIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
THERMAL SHUTDOWN FAULT INDICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
OPERATING MODE DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
DRIVER DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
THERMAL-MANAGEMENT EQUATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
TIMING SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
APPLICATION CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
INTERNAL RINGING LINE CARD SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
LINE CARD PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
PHYSICAL DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
PL 032 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
2
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
PRODUCT DESCRIPTION
Legerity’s Intelligent Access™ voice chipsets integrate all the functions of a subscriber line. Two chip types are used to implement
the line card: an Le79R251 device and an ISLAC device. Current ISLAC devices include the following: 79Q2241, 79Q2242,
79Q2243, and 79D2251. These provide the following basic functions:
1.
2.
The Le79R251 device: A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and
senses line conditions.
The ISLAC device: A low voltage CMOS IC that provides conversion, control and DSP functions for the Le79R251 device.
A complete schematic of the line card using the Intelligent Access voice chipsets for internal ringing is shown in “Internal Ringing
Line Card Schematic” on page 18.
The Le79R251 device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines.
It can be programmed by the ISLAC device to operate in eight different modes that control power consumption and signaling,
enabling it to have full control over the subscriber loop. The Le79R251 device is designed to be used exclusively with the ISLAC
devices, and requires only +5 V, 3.3 V battery supplies for its operation.
The Le79R251 device implements a linear loop-current feeding method with the enhancement of intelligent thermal
management. This limits the amount of power dissipated on the Le79R251 device chip by dissipating power in external resistors
in a controlled manner.
The ISLAC device contains high-performance circuits that provide A/D and D/A conversion for the voice (codec), DC-feed and
supervision signals. The ISLAC device contains a DSP core that handles signaling, DC-feed, supervision and line diagnostics for
all channels.
The DSP core selectively interfaces with three types of backplanes:
•
•
•
Standard PCM/MPI
Standard GCI
Modified GCI with a single analog line per GCI channel
The Intelligent Access voice chipset provides a complete software configurable solution to the BORSCHT functions as well as
complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In
addition, these chipsets provide system level solutions for the loop supervisory functions and metering. In total, they provide a
programmable solution that can satisfy worldwide line card requirements by software configuration.
Software programmed filter coefficients, DC-feed data and supervision data are easily calculated with the WinSLAC™ software.
This PC software is provided free of charge, and it allows the designer to enter a description of system requirements. WinSLAC
then computes the necessary coefficients and plots the predicted system results.
The Le79R251 device includes circuitry to report metallic voltages and longitudinal currents on Tip/Ring to the ISLAC device.
These inputs allow the ISLAC device to place several key Le79R251 device performance parameters under software control.
The main functions that can be observed and/or controlled through the ISLAC backplane interface are:
•
DC-feed characteristics
•
Ground-key detection
•
Off-hook detection
•
Metering signal
•
Longitudinal operating point
•
Subscriber line voltage and currents
•
Ring-trip detection
•
Abrupt and smooth battery reversal
•
Subscriber line matching
•
Ringing generation
•
Sophisticated line and circuit tests
To accomplish these functions, the ISLIC device collects the following information and feeds it, in analog form, to the ISLAC
device:
•
The metallic (IMT) and longitudinal (ILG) loop currents
•
The AC (VTX) and DC (VSAB) loop voltage
The outputs supplied by the ISLAC device to the ISLIC device are then:
•
A voltage (VHLi) that provides control for the following high-level ISLIC device outputs:
– DC loop current
– Internal ringing signal
Le79R251 ISLIC™ Data Sheet
3
P R E L I M I N A R Y
•
•
– 12 or 16 kHz metering signal
A low-level voltage proportional to the voice signal (VOUTi)
A voltage that controls longitudinal offset for test purposes (VLBi)
The ISLAC device performs the codec and filter functions associated with the four-wire section of the subscriber line circuitry in
a digital switch. These functions involve converting an analog voice signal into digital PCM samples and converting digital PCM
samples back into an analog signal. During conversion, digital filters are used to band-limit the voice signals.
The user-programmable filters set the receive and transmit gain, perform the transhybrid balancing function, permit adjustment
of the two-wire termination impedance and provide frequency attenuation adjustment (equalization) of the receive and transmit
paths. Adaptive transhybrid balancing is also included. All programmable digital filter coefficients can be calculated using
WinSLAC software and loaded into the ISLAC device registers using the system microprocessor. The PCM codes can be either
16-bit linear, twos-complement, or 8-bit companded A-law or µ-law.
Besides the codec functions, the Intelligent Access voice chipset provides all the sensing, feedback, and clocking necessary to
completely control ISLIC device functions with programmable parameters. System-level parameters under programmable control
include active loop current limits, feed resistance, and feed mode voltages.
The ISLAC device supplies complete mode control to the ISLIC device using the control bus (P1–P3) and tri-level load signal
(LDi).
The Intelligent Access voice chipset provides extensive loop supervision capability including off-hook, ring-trip and ground-key
detection. Detection thresholds for these functions are programmable and a programmable debounce timer is available that
eliminates false detection due to contact bounce.
For subscriber line diagnostics, AC and DC line conditions can be monitored using built-in test tools. Measured parameters can
be compared to programmed threshold levels to set a pass/fail bit and the user can choose to send the measurement data directly
to a higher level processor by way of the PCM voice channel. Both longitudinal and metallic resistance and capacitance can be
measured, which allows leakage resistance, line capacitance, and the number telephone ringers to be identified.
Note:
"i" denotes channel number.
4
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
LE79R251 DEVICE INTERNAL BLOCK DIAGRAM
IA sense
AD
IA
RSN
IA
600
SA
+
A Amplifier
-
Fault
Meas.
+
HPA
Active High Voltage
+
VBP
Power
Amplifiers
Positive
Supply
TMS
VTX
VREF
BGND
+
HPB
Fault
Meas.
+
+
VSAB
β = 0.00667
SB
-
B Amplifier
IB
VREF
IB sense
BD
VREF
IB
600
TMN
TMP
VREF
Thermal
Management
Control
Gain/Level Shift
To Power
Amplifiers
Thermal
Shutdown
VBH
Tip Open
Active Low Battery
Internal Ringing
Standby
Active Boosted Battery
Active High Battery
RYE
OHT Fixed Longitudinal
Voltage
VBL
IA
IB
+
600 600
IMT
IA
IB
600 600
ILG
Disconnect
High Neg
Batt Sel
R3
VLB
Decoder
R2
CREF
RD1
RD2
R1
BGND
RD3
C1
Control Register
C2
C3
Demux
P1
P2
P3
Le79R251 ISLIC™ Data Sheet
LD
VCC
GND
5
P R E L I M I N A R Y
FEATURES OF THE INTELLIGENT ACCESS™ CHIPSET
•
•
•
•
•
•
•
Performs all battery feed, ringing, signaling, hybrid and
test (BORSCHT) functions
Two chip solution supports high density, multi-channel
architecture
Single hardware design meets multiple country requirements through software programming of:
– Ringing waveform and frequency
– DC loop-feed characteristics and current-limit
– Loop-supervision detection thresholds
– Off-hook debounce circuit
– Ground-key and ring-trip filters
– Off-hook detect de-bounce interval
– Two-wire AC impedance
– Transhybrid balance
– Transmit and receive gains
– Equalization
– Digital I/O pins
– A-law/µ-law and linear selection
Supports internal and external battery-backed ringing
– Self-contained ringing generation and control
– Supports external ringing generator and ring relay
– Ring relay operation synchronized to zero crossings
of ringing voltage and current
– Integrated ring-trip filter and software enabled manual or automatic ring-trip mode
Supports metering generation with envelope shaping
Smooth or abrupt polarity reversal
Adaptive transhybrid balance
– Continuous or adapt and freeze
•
•
•
Supports both loop-start and ground-start signaling
Exceeds LSSGR and CCITT central office requirements
Selectable PCM or GCI interface
– Supports most available master clock frequencies
from 512 kHz to 8.192 MHz
On-hook transmission
Power/service denial mode
Line-feed characteristics independent of battery voltage
Only 5 V, 3.3 V and battery supplies needed
Low idle-power per line
Linear power-feed with intelligent power-management
feature
Compatible with inexpensive protection networks;
Accommodates low-tolerance fuse resistors while maintaining longitudinal balance
Monitors two-wire interface voltages and currents for
subscriber line diagnostics
Built-in voice-path test modes
Power-cross, fault, and foreign voltage detection
Integrated line-test features
– Leakage
– Line and ringer capacitance
– Loop resistance
Integrated self-test features
– Echo gain, distortion, and noise
Guaranteed performance over commercial and industrial
temperature ranges.
Up to three relay drivers per ISLIC™ device
– Configurable as test load switches
•
•
•
•
•
•
•
•
•
•
•
•
•
•
CHIPSET BLOCK DIAGRAM - FOUR CHANNEL LINE CARD EXAMPLE
7
4 VCCA
A1
VCCD
LD1
Am79R251
B1
DGND1
VREF
DGND2
4 IO(1-4)
7
A2
Am79R251
B2
A3
RC
Networks
and
Protection
LD2
7
TSCB
DRA/DD
Am79R251
LD3
B3
3
P1-P3
7
A4
Am79R251
LD4
B4
Quad
ISLAC
Am79Q2243
DRB
DXB
DXA/DU
DCLK/S0
PCLK/FS
RREF
RSHB
BATH
RSLB
BATL
MCLK
FS/DCL
CS/RST
DIO/S1
INT
RSPB
BATP
6
TSCA/G
AGND1
AGND2
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
1
VBP
2
BD
BGND
3
AD
VBH
4
VCC
VBL
CONNECTION DIAGRAM
32
31
30
R1
5
29
SB
R2
6
28
SA
RYE
7
27
IMT
26
ILG
25
CREF
R3
8
TMS
9
TMP
10
24
RSVD
TMN
11
23
HPB
P1
12
22
HPA
P2
13
21
VTX
14
15
16
17
18
19
20
P3
LD
VSAB
VLB
GND
RSN
VREF
Le79R251
32-Pin PLCC
Note:
Pin 1 is marked for orientation.
RSVD = Reserved. Don not connect to this pin.
Le79R251 ISLIC™ Data Sheet
7
P R E L I M I N A R Y
PIN DESCRIPTIONS
Pin
Pin Name
AD, BD
A, B Line Drivers
BGND
Ground
Ground return for high and low battery supplies.
CREF
+3.3 VDC
VCCD reference. It is the digital high logic supply rail, used by the ISLIC to ISLAC
interface.
GND
Ground
Analog and digital ground return for VCC.
HPA, HPB
High-Pass Filter
Capacitor
O
These pins connect to CHP, the external high-pass filter capacitor that separates
the DC loop-voltage from the voice transmission path.
ILG
Longitudinal Current
Sense
O
ILG is proportional to the common-mode line current (IAD – IBD), except in
disconnect mode, where ILG is proportional to the current into grounded SB.
IMT
Metallic Current Sense
O
IMT is proportional to the differential line current (IAD + IBD), except in disconnect
mode, where IMT is proportional to the current into grounded SA.The Le79R251
device indicates thermal overload by pulling IMT to >2.8 V.
I
The LD pin controls the input latch and responds to a 3-level input. When the LD
pin is a logic 1 (CREF - 1), the logic levels on P1–P3 latch into the Le79R251
device control register bits that operate the mode-decoder. When the LD pin is a
logic 0 (< 0.6 V), the logic levels on P1–P3 latch into the Le79R251 device control
register bits that control the relay drivers (RD1–RD3). When the LD pin level is at
~VREF ± 0.3 V the control register contents are locked.
LD
Description
Provide the currents to the A and B leads of the subscriber loop.
P1–P3
Control Bus
I
Inputs to the latch for the operating-mode decoder and the relay-drivers.
R1
Relay 1 Driver
O
Collector connection for relay 1 driver. Emitter internally connected to BGND.
R2
Relay 2 Driver
O
Collector connection for relay 2 driver. Emitter internally connected to RYE
R3
Relay 3 Driver
O
Collector connection for relay 3 driver. Emitter internally connected to RYE.
I
The metallic current between AD and BD is equal to 500 times the current into this
pin. Networks that program receive gain and two-wire impedance connect to this
node. This input is at a virtual potential of VREF.
RSN
Receive Summing
Node
RSVD
Reserved
RYE
Relay 2, 3 Common
Emitter
O
Emitter connection for R2 and R3. Normally connected to relay ground.
SA, SB
A, B Lead Voltage
Sense
I
Sense the voltages on the line side of the fuse resistors at the A and B leads.
External sense resistors, RSA and RSB, protect these pins from lightning or
power-cross.
TMP, TMN,
TMS
Thermal Management
External resistors connected from TMP to TMS and TMN to VBL to offload excess
power from the Le79R251 device.
VBH
Battery (Power)
Connection to high-battery supply used for ringing and long loops. Connects to the
substrate. When only a single negative battery is available, it connects to both
VBH and VBL.
VBL
Battery (Power)
Connection to low-battery supply used for short loops. When only a single negative
battery is available, this pin must be connected to VBH.
VBP
Positive Battery
(Power)
Used in Ringing State and for Extended Loop operation.
VCC
+5 V Power Supply
Positive supply for low voltage analog and digital circuits in the Le79R251 device.
VLB
Longitudinal Voltage
I
Sets the DC longitudinal voltage of the Le79R251 device. It is the reference for the
longitudinal control loop. When the VLB pin is greater than VREF, the Le79R251
device sets the longitudinal voltage to a voltage approximately half-way between
the positive and negative power supply battery rails. When the VLB pin is driven
to levels between 0V and VREF, the longitudinal voltage decreases linearly with
the voltage on the VLB pin.
VREF
1.4 V Analog
Reference
I
The ISLAC chip provides this voltage which is used by the Le79R251 device for
internal reference purposes. All analog input and output signals interfacing to the
ISLAC chip are referenced to this pin.
VSAB
Loop Voltage
O
Scaled-down version of the voltage between the sense points SA and SB on this
pin.
O
The voltage between this pin and VREF is a scaled down version of the AC
component of the voltage sensed between the SA and SB pins. One end of the
two-wire input impedance programming network connects to VTX. The voltage at
VTX swings positive and negative with respect to VREF.
VTX
8
Register Load
I/O
O
4-Wire Transmit Signal
This is used during Legerity testing. In the application, this pin must be left floating.
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
Stresses greater than those listed under Absolute Maximum Ratings can cause permanent device failure. Functionality at or
above these limits is not implied. Exposure to absolute maximum ratings for extended periods can affect device reliability.
Storage Temperature
Ambient temperature, under bias
VCC with respect to GND
–55 to +150° C
–40 to +85° C
–0.4 to +7 V
VBH, VBL with respect to GND (see Note 2)
+0.4 to –85 V
VBP with respect to GND
–0.4 to +85 V
VBP with respect to VBH
150 V
–3 to +3V
+7 V
BGND with respect to GND
Voltage on R1 relay outputs
AD or BD to BGND:
Continuous
VBH – 1 to VBP + 1
10 ms (F = 0.1 Hz)
VBH – 5 to VBP + 5
1 µs (F = 0.1 Hz)
VBH – 10 to VBP + 10
VBH – 15 to VBP + 15
250 ns (F = 0.1 Hz)
Current into SA or SB:
10 µs rise to Ipeak;
1000 µs fall to 0.5 Ipeak;
2000 µs fall to I =0
Current into SA or SB:
2 µs rise to Ipeak;
10 µs fall to 0.5 Ipeak;
20 µs fall to I = 0
SA SB continuous
Current through AD or BD
P1, P2, P3, LD to GND
ESD Immunity (Human Body Model)
IPEAK = ±5 mA
IPEAK = ±12.5 mA
5 mA
± 150 mA
–0.4 to VCC + 0.4 V
1000 V min
Charged device model
Maximum power dissipation, (See Note 1)
900 V
TA = 70°C
TA = 85°C
1.67 W
1.33 W
Note:
1.
Thermal-limiting circuitry on chip will shut down the circuit at a junction temperature of about 160° C. Operation above 145° C junction
temperature may degrade device reliability.
2.
Rise time of VBH (dv/dt) must be limited to less than 27 V/µs.
Thermal Resistance
The junction to air thermal resistance of the Le79R251 device in a 32-pin, PLCC package is 43°C/W. The typical junction to case
thermal resistance is 14°C/W. Measured under free air convection conditions and without external heat-sinking.
Electrical Operating Ranges
Legerity guarantees the performance of this device over commercial (0°C to 70°C) and industrial (–40°C to 85°C) temperature
ranges by conducting electrical characterization over each range, and by conducting a production test with single insertion
coupled to periodic sampling. These characterization and test procedures comply with section 4.6.2 of Bellcore TR-TSY-000357
Component Reliability Assurance Requirements for Telecommunications Equipment.
Environmental Ranges
Ambient Temperature
Ambient Relative Humidity
0 to 70°C Commercial
–40 to +85 °C extended temperature
5 to 95%
Le79R251 ISLIC™ Data Sheet
9
P R E L I M I N A R Y
Electrical Ranges
VCC
5 V ± 5%
VBL
–15 V to VBH
VBH
–18 to –79 V
VBP
+79 to +8 V
Maximum supply voltage across device, VBP–VBH
140 V
BGND with respect to GND
–100 to +100 mV
Load resistance on VTX to Vref
20 kΩ minimum
Load resistance on VSAB to Vref
20 kΩ minimum
SPECIFICATIONS
Power Dissipation
Loop resistance = 0 to ∞ unless otherwise noted (not including fuse resistors), 2 x 50 Ω fuse resistors.
For case 1: BATL = –36 V, BATH = –68 V, BATP = +52 V, and VCC = +5 V.
For case 2, BATL = -24 V, BATH = -48 V, BATP = +79 V, and VCC = +5 V.
For power dissipation measurements, DC-feed conditions are as follows:
•
•
•
•
•
ILA (Active mode current limit) = 25 mA (IRSN = 50 µA)
RFD (Feed resistance) = 500 Ω
VAS (Anti-sat activate voltage) = 10 V
VAPP (Apparent Battery Voltage) = 48 V
RMGL = RMGP (Thermal management resistors) = 1 kΩ
Description
Power Dissipation Normal
Polarity
Case 1
Test Conditions
Typ
10
Typ
Max
On-Hook Disconnect
65
85
55
80
On-Hook Standby
110
140
90
120
On-Hook Transmission
Fixed Longitudinal Voltage
ISLIC
210
270
170
220
On-Hook Active High Battery
ISLIC
300
420
220
350
Off-Hook Active Low Battery
RL = 294 Ω
ISLIC
TMG
700
200
800
240
400
40
500
60
600
970
660
1050
On-Hook Active Boost Battery
Power Supply Currents
Case 2
Max
On-Hook Disconnect
VBH
VBL
VCC
VBP
0.6
0.1
3.9
0.08
0.9
0.2
4.5
0.15
0.6
0.1
3.9
0.08
0.9
0.2
4.5
0.15
On-Hook Standby
VBH
VBL
VCC
VBP
1.3
0
4.3
0.12
1.7
0
5
0.3
1.3
0
4.3
0.12
1.7
0
5
0.3
On-Hook Transmission
Fixed Longitudinal Voltage
VBH
VBL
VCC
VBP
3.5
0
7.2
0.10
4.0
0
8.5
0.2
3.5
0
7.2
0.10
4.0
0
8.5
0.2
On-Hook Active High Battery
VBH
VBL
VCC
VBP
4
0
8.2
0.10
6
0
11
0.2
4
0
8.2
0.10
6
0
11
0.2
Off-Hook Active Low Battery
RL = 294 Ω
VBH
VBL
VCC
VBP
2.2
27.5
8.2
0.10
3
30
11
0.2
2.2
27.5
8.2
0.10
3
30
11
0.2
Active Boost
Battery On-Hook
VBH
VBL
VCC
VBP
5
0
5
5
8.5
0
8.5
7.5
5
0
5
5
8.5
0
8.5
7.5
Le79R251 ISLIC™ Data Sheet
Unit
mW
mA
P R E L I M I N A R Y
DC Specifications
30 k Ω
30 k Ω
RT Network
390 pf
VREF
Unless otherwise specified, test conditions are: VCC = 5 V, RMGP = RMGL = 1 kΩ, BATH = –68 V, BATL =
–36 V, BATP = +52 V, RRX = 150 kΩ, RL = 600 Ω, RSA = RSB = 200 kΩ, RFA = RFB = 50 Ω, CHP = 22 nF,
CAD = CBD = 22 nF, IRSN = 50 µA. DC-feed conditions are normally set by the ISLAC device. When the
Le79R251 device is tested by itself, its operating conditions must be simulated as if it were connected to
an ideal ISLAC device.
No.
Item
Condition
Min
Typ
Max
|VBH| – 9
|VBH|–8
|VBH|–7
48
52
55
13.88
15
19.8
22
130
Standby mode, RL = 600 Ω
Standby mode, RL = 2200 Ω
Standby mode, open circuit,
|VBH| < 55 V
|VBH| > 55 V
1
2
Two-wire loop voltage,
including offset (VA-VB)
Feed resistance per leg at
pins AD & BD
Feed current limit
3
IMT current
Unit
Note
16.13
V
2
250
375
Ω
18
30
40
mA
44.6
56
GND – VB
55
Any Active mode (does not
include OHT), RL = 600 Ω,
IRSN = 50 µA
OHT mode, RL = 2200 Ω,
IRSN = 20 µA
Standby mode
Feed current
Standby mode
ILG current
A to VBH
25.7
B to Ground
25.7
µA
Low boundary
4
Ternary input voltage
boundaries for LD pin. Midlevel input source must be
Vref.
5
Logic Inputs P1, P2, P3
6
VTX output offset
Medium boundary
VREF–0.3
High boundary
CREF – 1
0.6
V
VREF+0.3
V
V
Input high current
–20
20
µA
2
Input low current
–20
20
µA
2
Mid-level current
–20
20
µA
2
Input high voltage
2.0
V
Input low voltage
0.6
V
20
µA
Input high current
–20
Input low current
–20
20
µA
–50
+50
mV
µA
2
2
VREF = 1.4 V, Active Low Battery
7
8
VREF input current
CREF input current
ILOOP = -25 mA
60
120
ILOOP = 0 mA
200
300
CREF = 3.3 V
1
10
µA
0.00606
0.00667
0.00740
V/V
41
45
49
V/V
2
2
β, DC Ratio of VSAB to
loop voltage:
9
10
V SAB
β = -------------------------VSA – VSB
Tj < 145°C, VSA – VSB = 22 V
Gain from VLB pin to A or B
pin
11
VLB pin input current
VLB = VREF ±1V
–100
100
µA
12
ILOOP/IMT
ILOOP = 10 mA
290
300
350
A/A
13
ILONG/ILG
ILONG = 10 mA
580
600
700
A/A
14
Input current, SA and SB
pins
Active modes
1.0
3.0
µA
15
K1
Incremental DC current gain
462
500
538
16
ISA/IMT
Disconnect, ISA = 2 mA
5.0
6
7
17
ISB/ILG
Disconnect, ISB = 2 mA
10
12
18
VSAB output offset
-20
19
IMT output offset
–3
Le79R251 ISLIC™ Data Sheet
0
2
2
A/A
14
20
mV
3
µA
11
P R E L I M I N A R Y
No.
20
Item
Condition
ILG output offset
Min
Typ
Max
Unit
–3
0
3
µA
Note
Relay Driver Specifications
No.
Item
Typ
Max
25 mA/relay sink
Condition
Min
0.4
0.5
40 mA/ relay sink
0.8
1.0
0
100
1
On Voltage
2
R2,R3 Off Leakage
3
Zener Break Over, R1
Iz = 100 µA
9
9.5
10.5
4
Zener On Voltage, R1
Iz = 30 mA
8.0
8.8
9.5
R2,R3 = BGND
RYE = VBH
Figure 1.
Unit
Note
V
2
µA
V
Relay Drivers
R3
R2
RYE
A. Relay Driver Configuration
R1
BGND
B. Ring Relay
Transmission Specifications
No.
Item
Condition
1
RSN input impedance
2
VTX output impedance
3
Max, AC + DC loop current
Active High Battery, Active Low
Battery, Active Boosted Battery
4
Input impedance, A or B to GND
Active mode
5
2-4 wire gain
6
2-4 wire gain variation with
frequency
7
2-4 wire gain tracking
f = 300 to 3400 Hz
–10 dBm, 1 kHz, 0 to 70°C
TA = –40°C to 85°C
Typ
Max
1
10
3
20
70
70
135
–14.13
–13.98
–13.83
–14.18
–13.98
–13.78
Note
2
2
Ω
2
–0.1
+0.1
TA=–40°C to 85°C
–0.15
+0.15
2
5
+3 dBm to –55 dBm
Reference: –10 dBm
–10 dBm, 1 kHz
–0.1
0
+0.1
–0.15
0
+0.15
–0.15
0
+0.15
–0.2
0
+0.2
9
4-2 wire gain variation with
frequency
300 to 3400 Hz, relative to 1 kHz
–0.1
+0.1
10
4-2 wire gain tracking
+3 dBm to –55 dBm
Reference: –10 dBm
–0.1
+0.1
4-2 wire gain
Ω
mA
TA= –40°C to 85°C
8
Unit
300 to 3400 Hz, relative to 1 kHz
TA = –40 to 85°C
12
Min
Le79R251 ISLIC™ Data Sheet
dB
2, 5
2
2, 5
P R E L I M I N A R Y
No.
11
12
Item
Condition
Max
Unit
0 dBm
–50
dB
11.2 dBm
–40
dB
–12 dBm
–48
dB
–0.8 dBm
–38
dB
Total harmonic distortion level
300 Hz to 3400 Hz
2-wire
4-wire
Typ
4-wire overload level at VTX
RLOAD = 600 Ω
Idle channel noise
Active modes, RL = 600 Ω
C-message
2-wire
+7
Weighted
4-wire
–7
Psophometric
2-wire
–83
Weighted
4-wire
–97
L-T
Longitudinal balance
200 to 1000 Hz
58
53
1000 to 3400 Hz
53
TA = –40°C to 85°C
48
T-L
200 to 3400 Hz
40
L-T
IL = 50 to 3400 Hz
L-T
200 to 1000 Hz
Normal Polarity
Reverse Polarity
±1
TA = –40°C to 85°C
(IEEE method)
13
Min
TA = –40°C to 85°C
50 to 3400 Hz
14
PSRR (VBH, VBL, VBP)
15
PSRR (VCC)
16
Longitudinal AC current per wire
dBrnC
–79
dBmp
2
58
2
63
dB
50
2
48
3.4 K to 50 kHz
25
3.4 K to 50 kHz
F = 15 to 60 Hz Active mode
+11
2
63
25
50 to 3400 Hz
Vp
Note
45
3,4
40
1, 2, 4
45
3, 4
35
1, 2, 4
20
30
mArms
2
40
56
dB
2
Max
Unit
Note
133
V
7
Freq = 12 kHz 2.8 Vrms
17
Metering distortion
Freq = 16 kHz
metering load = 200 Ω
Ringing Specifications
No.
1
Item
Condition
Peak Ringing Voltage
Min
Active Internal Ringing
Typ
(VBP-VBH) - 10 V
Current-Limit Behavior
No.
SLIC Mode
Condition
Min
Typ
Max
Unit
Note
1
VBH/200K
100
µA
A
6
1
Disconnect
Applied fault between ground and T/R
VBH applied to Tip or Ring
2
Tip Open
Short to GND
30
40
3
Standby
Short Tip-to-VBH
30
45
Short Ring-to-GND
30
40
4
Active Ringing
ISLAC generating internal ringing
100
mA
Thermal Shutdown Fault Indications
No.
Fault
Indication
1
No Fault
ILG, IMT operates normally (Vref ±1V)
2
Thermal Shutdown
ILG, IMT above 2.8 V
Note:
1.
These tests are performed with the following load impedances:
Frequency < 12 kHz – Longitudinal impedance = 500 Ω; metallic impedance = 300 Ω
Frequency > 12 kHz – Longitudinal impedance = 90 Ω; metallic impedance = 135 Ω
2.
Not tested or partially tested in production. This parameter is guaranteed by characterization or correlation to other tests.
3.
This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
Le79R251 ISLIC™ Data Sheet
13
P R E L I M I N A R Y
4.
When the Le79R251 device and ISLAC device is in the anti-sat operating region, this parameter is degraded. The exact degradation
depends on system design.
5.
–55 dBm gain tracking level not tested in production. This parameter is guaranteed by characterization and correlation to other tests.
6.
This spec is valid from 0 V to VBL or –50 V, whichever is lower in magnitude.
7.
Other ringing-voltage characteristics are set by the ISLAC device.
OPERATING MODES
The Le79R251 device receives multiplexed control data on the P1, P2 and P3 pins. The LD pin controls the loading of P1, P2,
and P3 values into the proper bits in the Le79R251 device control register. The device control register is a register in within the
Le79R251 that latches the multiplexed relay and state data. This is organized as two sets of three bits: RD1-RD3 for the relay
data and C1-C3 for the state control. When the LD pin is less than 0.6 V, P1–P3 will contain data for relay control bits RD1, RD2
and RD3. These are latched into the first three bits in the Le79R251 device control register. When the LD pin is more than
CREF - 1, P1–P3 will contain ISLIC control data C1, C2, and C3, which are latched into the last three bits of the Le79R251 device
control register. Setting the voltage on the LD pin to VREF ± 0.3 V locks the contents of the Le79R251 device control register.
The operating mode of the Le79R251 device is determined by the C1, C2, and C3 bits in the control register of the Le79R251
device. The table below defines the Le79R251 device operating modes set by these signals.
Under normal operating conditions, the ISLIC device does not have active relays. The Le79R251 device to ISLAC device
interface is designed to allow continuous real-time control of the relay drivers to avoid incorrect data loads to the relay bit latches
of the Le79R251 devices.
To perform external ringing, the ISLAC device from the Intelligent Access voice family is set to external ringing mode
(RMODE = 1), enables the ring relay, and puts the Le79R251 device in the Standby mode.
Table 1. Operating Mode Descriptions
C3
C2
C1
Battery Voltage
Selection
Operating Mode
Operating Mode
14
Notes
0
0
0
Standby
High Battery (BATH)
and BGND
(High ohmic feed): Loop
supervision active, A and B
amplifiers shut down
Open
1
0
0
1
Tip Open
High Battery (BATH)
and BGND
Tip Open: AD at HighImpedance, Channel A power
amplifier shut down
Open
1
High Battery (BATH)
and BGND
Fixed longitudinal voltage of
–29 V
AD and BD at High-Impedance,
Channel A and B power
amplifiers shut down
0
1
0
On-Hook
Transmission,
Fixed Longitudinal
Voltage
0
1
1
Disconnect
Low Battery selection
at VBL
1
0
0
Active Boosted
Battery
High Battery (BATH)
and Positive Battery
(BATP)
1
0
1
Active High Battery
High Battery (BATH)
and BGND
1
1
0
Active Low Battery
Low Battery (BATL)
and BGND
1
1
1
Active Internal
Ringing
High Battery (BATH)
and Positive Battery
(BATP)
Active feed, normal or reverse
polarity
Active internal ringing
Note:
1.
Connection
to RMGPi &
RMGLi
Resistors
In these modes, the ring lead (B-lead) output has a –50 V internal clamp to battery ground (BGND).
Le79R251 ISLIC™ Data Sheet
A and B
Amplifier
Output
P R E L I M I N A R Y
Operating Mode Descriptions
Operating Mode
Disconnect
Description
This mode disconnects both A and B output amplifiers from the AD and BD outputs. The A and B amplifiers
are shut down and the Le79R251 device selects the low battery voltage at the VBL pin. In the Disconnect
state, the currents on IMT and ILG represent the voltages on the SA and SB pins, respectively. These
V SA
400
V
400
SB
currents are scaled to produce voltages across RMTi and RLGi of ---------- and ---------- , respectively.
Standby
The power amplifiers are turned off. The AD output is driven by an internal 250 Ω (typical) resistor, which
connects to ground. The BD output is driven by an internal 250 Ω (typical) resistor, which connects to the
high battery (BATH) at the VBH pin, through a clamp circuit, which clamps to approximately –50 V with
respect to BGND. For VBH values above–55 V, the open-circuit voltage, which appears at this output is
~VBH + 8 V. If VBH is below –55 V, the voltage at this output is –50 V. The battery selection for the balance
of the circuitry on the chip is VBL. Line supervision remains active. Current limiting is provided on each line
to limit power dissipation under short-loop conditions as specified in the “Le79R251 device Current-Limit
Behavior” section. In external ringing, the standby ISLIC state is selected.
Tip Open
In this mode, the AD (Tip) lead is opened and the BD (Ring) lead is connected to a clamp, which operates
from the high battery on VBH pin and clamps to approximately –50 V with respect to BGND through a resistor
of approximately 250 Ω (typical). The battery selection for the balance of the circuitry on the chip is VBL.
Active High Battery
In the Active High Battery mode, battery connections are connected as shown in “Operating Modes” on
page 14. Both output amplifiers deliver the full power level determined by the programmed DC-feed
conditions. Active High Battery mode is enabled during a call in applications when a long loop can be
encountered. SBAT = VBH.
Active Low Battery
Both output amplifiers deliver the full power level determined by the programmed DC-feed conditions. VBL,
the low negative battery, is selected in the Active Low Battery mode. This is typically used during the voice
part of a call. SBAT = VBL.
Active Boosted
Battery
In the Active Boosted Battery mode, battery connections are as shown in “Operating Modes” on page 14.
Both output amplifiers deliver the power level determined by the programmed DC-feed conditions. Active
Boosted Battery mode is enabled during a call in applications when an extended loop can be encountered.
SBAT = VBP - VBH.
Active Internal
Ringing
In the Internal Ringing mode, the Le79R251 device selects the battery connections as shown in “Operating
Modes” on page 14. When using internal ringing, both the AD and BD output amplifiers deliver the ringing
signal determined by the programmed ringing level. SBAT = VBP - VBH.
On-Hook
Transmission
(OHT), Fixed
Longitudinal
Voltage
In the On-Hook Transmission, Fixed Longitudinal Voltage mode, battery connections are as shown in
“Operating Modes” on page 14. The longitudinal voltage is fixed (as defined in the Table , “Operating Modes,”
on page 14) to allow compliance with safety specifications for some classes of products, such as ones
needing to meet the requirements of UL1950. SBAT = VBH.
Driver Descriptions
Control bits RD1, RD2, and RD3 do not affect the operating mode of the Le79R251 device. These signals perform the following
functions:
Driver
R1
Description
A logic 1 on RD1 turns the R1 driver on and operates a relay connected between the R1 pin and VCCD. R1
drives the ring relay when external ringing is selected.
A logic 1 on the RD2 signal turns the R2 driver on and routes current from the R2 pin to the RYE pin. In the
option where the RYE pin is connected to ground, the R2 pin can sink current from a relay connected to VCCD.
R2
Another option is to connect the RYE pin to the BD (Ring) lead and connect a test load between R2 and the
AD(Tip) lead. This technique avoids the use of a relay to connect a test load. However, it does not isolate the
subscriber line from the line card. The test load must be connected to the Le79R251 device side of the
protection resistor to avoid damage to the R2 driver.
A logic 1 on the RD3 signal turns the R3 driver on and routes current from the R3 pin to the RYE pin. In the
option where the RYE pin is connected to ground, the R3 pin can sink current from a relay connected to VCCD.
R3
Another option is to connect the RYE pin to the B (Ring) lead and connect a test load between R3 and the A(Tip)
lead. This technique avoids the use of a relay to connect a test load. However, it does not isolate the subscriber
line from the line card. The test load must be connected to the Le79R251 device side of the protection resistor
to avoid damage to the R3 driver.
Le79R251 ISLIC™ Data Sheet
15
P R E L I M I N A R Y
Thermal-Management Equations
Applies to all Modes except Standby and Ringing which have no thermal management:
IL < 7.5 mA
TMG resistor-current is limited to be 7.5 mA < IL. If IL < 7.5 mA,
no current flows in the TMG resistor and it all flows in the
Le79R251.
PSLIC = (SBAT – IL(RL + 2RFUSE)) • IL + 0.3 W
PTRTMG = 0
These equations are valid when
RTMG • (IL – 7.5 mA) < (SBAT – (RF + RL)IL) / 2 – 2
because the longitudinal voltage is one-half the battery voltage
and the TMG switches require approximately 2 V.
IL > 7.5 mA
RTMG = (SBAT – IL(RL + 2RFUSE)) / (2(IL – 7.5 mA))
PSLIC = IL(SBAT – IL(RL + 2RFUSE)) + 0.3 W – PTRTMG
2
PTRTMG = (IL – 7.5 mA) (2RTMG)
To choose a power rating for RTMG:
PRATING > PTRTMG / 2
Note that for reliable operation, PSLIC should be less than
1.33 W.
TIMING SPECIFICATIONS
Symbol
trSLD
Signal
LD
Parameter
Min
Rise time Le79R251 device LD pin
Typ
Max
Unit
2
tfSLD
LD
Fall time Le79R251 device LD pin
tSLDPW
LD
LD minimum pulse width
2
tSDXSU
P1,P2,P3
P1–3 data Setup time
4.5
tSDXHD
P1,P2,P3
P1–3 data hold time
4.5
tSDXD
P1,P2,P3
Max P1–3 data delay
3
µs
5
Note:
1.
The P1–3 pins are updated continuously during operation by the LD signal.
2.
After a power-on reset or hardware reset, the relay outputs from the Le79R251 device turn all relays off. An unassuming state is to place
the relay control pins, which are level triggered, to a reset state for all relays. Any noise encountered only raises the levels toward the register
lock state.
3.
When writing to the ISLIC registers, the sequence is:
a)
Set LD pin to mid-state
b)
Place appropriate data on the P1–3 pins
c)
Assert the LD pin to High or Low to write the proper data
d)
Return LD pin to mid-state
4.
Le79R251 device registers are refreshed at 5.33 kHz when used with an ISLAC device.
5.
If the clock or MPI becomes disabled, the LD pins and P1–3 returns to 0 V state, thus protecting the Le79R251 device and the line
connection.
6.
Not tested in production. Guaranteed by characterization.
16
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
WAVEFORMS
187.5 usec
LD
P1,P2,P3
S
R
S
R
S
Write State Register
VCC
LD
R
VREF
Lock Registers
0V
Write Relay Register
Previous
State Data
P1,P2,P3 Relay Data
Relay Data
New State
Data
DETAIL A
VREF
LD
Write State Register
trSLD
tfSLD
VREF
Write Relay Register
tSLDPW
tSDXHD
tSDXSU
P1,P2,P3
tSDXD
Le79R251 ISLIC™ Data Sheet
Relay driver
response
17
P R E L I M I N A R Y
APPLICATION CIRCUIT
Internal Ringing Line Card Schematic
+5V
VCC
RSAi
3.3V
CREF
SA
RRXi
RSN
VOUTi
DGND
RHLai
A
RFAi
RHLbi
CHLbi
AD
VHLi
U3
RHLci
U5
RTi
RHLdi
CHLdi
AGND
VREF
CADi
VCCA
VSAB
CHPi
BATH
CS1
CS2
U4
U6
VSABi
VCC
+3.3VDC
VCCD
HPA
BATP
VTX
DT1i
VINi
HPB
CSSi
B
RFBi
BD
VLB
VLBi
IMT
VIMTi
RSBi
SB
CBDi
TMS
RTEST
RMTi
U1
Am79R251
U2
ISLAC
VREF
RMGPi
ILG
VILGi
BACK
PLANE
TMP
DT2i
RLGi
TMN
VREF
RMGLi
DHi
BATH
VREF
VBH
VREF
DLi
BATL
VBL
LD
LDi
SBP
GND
CBATHi
CBATLi
CBATPi
BATP
BATP
RSPB
P1
P1
P2
P2
P3
P3
SLB
BATL
RSLB
SHB
BATH
RSHB
VBP
RYE
IREF
R2
RREF
R3
R1
BGND
RSVD
Note:
1.
CSS required for > 2.2 VRMS metering.
2.
Connections are shown for one channel.
18
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
LINE CARD PARTS LIST
The following list defines the parts and part values required to meet target specification limits for channel i of the line card (i =
1,2,3,4).
Item
Type
Value
Tol.
Rating
Comments
Components for Internal and External Ringing
U1
Le79R251 device
ISLIC device
U2
Am79X22xx
ISLAC device
U3, U4
B1100CC
100 V
TECCOR Battrax protector
U5, U6
B2100CC
100 V
TECCOR Battrax protector
DHi, DLi, DT1i, DT2i
Diode
100 mA
RFAi, RFBi
Resistor
50 Ω
100 V
50 ns
2%
2W
Fusible PTC protection resistors
Sense resistors
RSAi, RSBi
Resistor
200 kΩ
2%
1/4 W
RTi
Resistor
80.6 kΩ
1%
1/10 W
RRXi
Resistor
90 kΩ
1%
1/10 W
RREF
Resistor
69.8 kΩ
1%
1/10 W
Current reference
RMGLi, RMGPi
Resistor
1 kΩ
5%
1W
Thermal management resistors
RSHB, RSLB
Resistor
750 kΩ
1%
1/8 W
RHLai
Resistor
40.2 kΩ
1%
1/10 W
RHLbi
Resistor
4.32 kΩ
1%
1/10 W
RHLci
Resistor
2.87 kΩ
1%
1/10 W
RHLdi
Resistor
2.87 kΩ
1%
1/10 W
CHLbi
Capacitor
3.3 nF
10%
10 V
Not Polarized
CHLdi
Capacitor
0.82 µF
10%
10 V
Ceramic
RMTi
Resistor
3.01 kΩ
1%
1/8 W
RLGi
Resistor
6.04 kΩ
1%
1/8 W
RTEST
Resistor
2 kΩ
1%
1W
Test board
1
Capacitor
22 nF
10%
100 V
Ceramic, not voltage sensitive
CBATHi, CBATLi, CBATPi
Capacitor
100 nF
20%
100 V
Ceramic
CHPi
Capacitor
22 nF
20%
100 V
Ceramic
CS1i, CS2i1
Capacitor
100 nF
20%
100 V
Protector speed up capacitor
3
Capacitor
56 pF
5%
100 V
Ceramic
CADi, CBDi
CSSi
Note:
1.
Value can be adjusted to suit application.
2.
Can be looser for relaxed ring-trip requirements.
3.
Required for metering > 2.2 Vrms, otherwise may be omitted.
Le79R251 ISLIC™ Data Sheet
19
P R E L I M I N A R Y
PHYSICAL DIMENSIONS
PL 032
Dwg rev AH; 08/00
20
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
The contents of this document are provided in connection with Legerity, Inc. products. Legerity makes no representations or warranties with respect to the accuracy
or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. No
license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. Except as set forth in Legerity's
Standard Terms and Conditions of Sale, Legerity assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including,
but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right.
Legerity's products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other
applications intended to support or sustain life, or in any other application in which the failure of Legerity's product could create a situation where personal injury,
death, or severe property or environmental damage may occur. Legerity reserves the right to discontinue or make changes to its products at any time without notice.
© 2001 Legerity, Inc.
All rights reserved.
Trademarks
Legerity, the Legerity logo and combinations thereof, and ISLIC, ISLAC, Intelligent Access, and WinSLAC are trademarks of Legerity, Inc.
Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
Le79R251 ISLIC™ Data Sheet
21
Americas
Mailing:
P.O. Box 18200
Austin, TX 78760-8200
Shipping: 4509 Freidrich Lane
Austin, TX 78744-1812
ATLANTA
6465 East Johns Crossing, Suite 400
Duluth, GA USA 30097
MainLine: 770-814-4252
Fax: 770-814-4253
AUSTIN
4509 Freidrich Lane
Austin, TX USA 78744-1812
MainLine: 512-228-5400
Fax: 512-228-5510
BOSTON
6 New England Executive Park Suite 400
Burlington, MA USA 01803
MainLine: 781-229-7320
Fax: 781-272-3706
CHICAGO
8770 W. Bryn Mawr, Suite 1300
Chicago, IL USA 60631
MainLine: 773-867-8034
Fax: 773-867-2910
DALLAS
4965 Preston Park Blvd., Suite 280
Plano, TX USA 75093
MainLine: 972-985-5474
Fax: 972-985-5475
HUNTSVILLE
600 Boulevard South, Suite 104
Huntsville, AL USA 35802
MainLine: 256-705-3504
Fax: 256-705-3505
IRVINE
1114 Pacifica Court, Suite 250
Irvine, CA USA 92618
MainLine: 949-753-2712
Fax: 949-753-2713
NEW JERSEY
3000 Atrium Way, Suite 270
Mt. Laurel, NJ USA 08054
MainLine: 856-273-6912
Fax: 856-273-6914
OTTAWA
600 Terry Fox Drive
Ottawa, Ontario, Canada K26 4B6
MainLine: 613-599-2000
Fax: 613-599-2002
RALEIGH
2500 Regency Parkway, Suite 226
Cary, NC USA 27511
MainLine: 919-654-6843
Fax: 919-654-6781
SAN JOSE
1740 Technology Drive, Suite 290
San Jose, CA USA 95110
MainLine: 408-573-0650
Fax: 408-573-0402
Telephone: (512) 228-5400
Fax: (512) 228-5510
North America Toll Free: (800) 432-4009
Worldwide Sales Offices
Asia
Europe
HONG KONG
Units 2401-2, 24th Floor
Jubilee Centre, 18 Fenwick Street
Wanchai, Hong Kong
MainLine: 852-2864-8300
Fax: 852-2866-1323
BELGIUM
Baron Ruzettelaan 27
8310 Brugge
Belgium
MainLine: 32-50-28-88-10
Fax: 32-50-27-06-44
KOREA
135-090 18th Fl., Kyoung Am Bldg
157-26, Samsung-dong, Kangnam-ku
Seoul, Korea
MainLine: 82-2-565-5951
Fax: 82-2-565-3788
FRANCE
7, Avenue G. Pompidou
Suite 402
92300 Levallois-Perret, France
MainLine: 33-1-47-48-2206
Fax: 33-1-47-48-2568
SHANGHAI
Shanghai P.O. Box 232022
Shanghai PR China 200232
MainLine: 86-21-54233253
Fax: 86-21-54233254
GERMANY
Freisinger Str. 1
85737 Ismaning, Germany
MainLine: 49-89-1893-99-0
Fax: 49-89-1893-99-44
SHENZHEN
Room 310, Tower 9
Jinxiu Street 30 Futian District
Shenzhen, PR China 518040
MainLine: 86-755-3706-667
Fax: 86-755-3706-520
ITALY
Via F. Rosselli 3/2
20019 Settimo Mse, Milano Italy
MainLine: 39-02-3355521
Fax: 39-02-33555232
SINGAPORE
Serangoon Central Post Office
P.O. Box 537
Singapore 915502
MainLine: 65-2803267
Fax: 65-2855869
TOKYO
Shinjuku NS Bldg. 5F
2-4-1 Nishi Shinjuku, Shinjuku-ku
Tokyo, Japan 163-0805
MainLine: 81-3-5339-2011
Fax: 81-3-5339-2012
SWEDEN
Frösundaviks Allé 15, 4tr
SE-16970 Solna
Sweden
MainLine: 46-8-509-045-45
Fax: 46-8-509-046-36
UK
Regus House, Windmill Hill Business Park
Whitehill Way
SN5 6QR Swindon
Wiltshire UK
MainLine: 44-(0)1793-441408
Fax: 44-(0)1793-441608
To download or order product literature, visit our website at www.legerity.com.
To order literature in North America, call:(800) 572-4859 or 512-349-3193
or email: [email protected]
To order literature in Europe or Asia, call: 44-0-1179-341607
or email: Europe — [email protected]
Asia — [email protected]