LE79R251JC [ETC]
Telecommunication IC ; 电信IC\n
| 型号： | LE79R251JC |
| 厂家： | 
ETC |
| 描述： | Telecommunication IC
|
| 文件： | 总22页 (文件大小：514K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
P R E L I M I N A R Y
ISLIC™
Intelligent Subscriber Line Interface Circuit
Le79R251 device
APPLICATIONS
ORDERING INFORMATION
An ISLAC™ device must be used with this part.
Device Package
Le79R251JC 32-pin PLCC
Provides a cost-effective voice solution for long loop
applications providing POTS and integrated test
capabilities.
— CO
— DLC
— PBX/KTS
— Pair Gain
DESCRIPTION
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.
FEATURES
Monitor of two-wire interface voltages and currents
supports
— Voice transmission
— Through chip ring generation
— Programmable DC feed characteristics
–
–
Independent of battery
Current limited
RELATED LITERATURE
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
080274 Am79D2251 Dual ISLAC Data Sheet
080250 Am79Q224x Quad ISLAC Data Sheet
080345 Am79R2xx/Am79D2251 Technical Reference
080344 Am79R2xx/Am79Q224x Technical Reference
–
–
–
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
BLOCK DIAGRAM
RSN
VTX
Signal
Transmission
AD
SA
— Provides the highest ringing capability in Legerity's
HPA
HPB
SB
Intelligent Access Voice family.
Two-Wire
Interface
Longitudinal
Control
Gain/Level
Shift
VLB
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
Attenuator
VSAB
VREF
BD
IMT
ILG
Signal
Conditioning
TMN
TMP
Thermal
Management
Control
CREF
Fault
Meas
— Maintains longitudinal balance with low tolerance fuse
TMS
resistors or PTC thermistors
VBP
VBL
Provides pulse metering
— 12 kHz and 16 kHz
— Smooth polarity reversal
Switch
Driver
Tip-open state supports ground start signaling
Integrated test load switches/relay drivers
5 REN with 20 V DC offset trapezoid.
For US standard:
VBH
R2
Relay
Control
Input
Decoder
and
Control
Registers
P1
P2
P3
Relay
Drivers
R3
RYE
— drives ring up to 16.9 kft of 26 gauge wire.
or
R1
Relay Driver 1
LD
— 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.
BGND
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. The Le79R251 device: A high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and
senses line conditions.
2. The ISLAC device: A low voltage CMOS IC that provides conversion, control and DSP functions for the Le79R251 de-
vice.
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
RSN
AD
IA sense
IA
IA
600
SA
+
-
A Amplifier
Fault
Meas.
+
-
HPA
VBP
Active High Voltage
VTX
+
Power
Amplifiers
Positive
Supply
TMS
HPB
VREF
BGND
+
-
-
+
Fault
Meas.
+
β
= 0.00667
VSAB
VREF
-
SB
BD
VREF
B Amplifier
IB
IB sense
IB
600
VREF
TMN
Thermal
Management
Control
Gain/Level Shift
VLB
TMP
VBH
To Power
Amplifiers
Thermal
Shutdown
High Neg
Batt Sel
IA
IB
IMT
ILG
+
VBL
R3
600 600
IA
IB
-
600 600
RYE
R2
Decoder
C2 C3
CREF
RD1 RD2 RD3
C1
Control Register
R1
Demux
BGND
P1
P2
P3
LD
VCC
GND
Le79R251 ISLIC™ Data Sheet
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
•
•
•
Supports both loop-start and ground-start signaling
Exceeds LSSGR and CCITT central office requirements
Selectable PCM or GCI interface
test (BORSCHT) functions
Two chip solution supports high density, multi-channel
architecture
–
Supports most available master clock frequencies
Single hardware design meets multiple country require-
from 512 kHz to 8.192 MHz
ments through software programming of:
•
•
•
•
•
•
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
–
–
–
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
Linear power-feed with intelligent power-management
–
–
–
–
–
–
–
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
feature
•
Compatible with inexpensive protection networks;
Accommodates low-tolerance fuse resistors while main-
taining 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
•
Supports internal and external battery-backed ringing
–
–
–
Self-contained ringing generation and control
Supports external ringing generator and ring relay
–
–
–
Leakage
Line and ringer capacitance
Loop resistance
Ring relay operation synchronized to zero crossings
of ringing voltage and current
•
Integrated self-test features
Echo gain, distortion, and noise
–
Integrated ring-trip filter and software enabled man-
ual or automatic ring-trip mode
–
•
•
•
Supports metering generation with envelope shaping
Smooth or abrupt polarity reversal
Adaptive transhybrid balance
•
•
Guaranteed performance over commercial and industrial
temperature ranges.
Up to three relay drivers per ISLIC™ device
–
Configurable as test load switches
–
Continuous or adapt and freeze
CHIPSET BLOCK DIAGRAM - FOUR CHANNEL LINE CARD EXAMPLE
7
4
4
VCCA
A1
Am79R251
Am79R251
Am79R251
Am79R251
LD1
VCCD
B1
DGND1
DGND2
IO(1-4)
TSCA/G
TSCB
VREF
7
7
A2
B2
LD2
RC
Networks
and
AGND1
AGND2
A3
B3
DRA/DD
DRB
Protection
LD3
Quad
ISLAC
Am79Q2243
P1-P3
DXB
3
7
DXA/DU
DCLK/S0
PCLK/FS
MCLK
A4
B4
LD4
RREF
FS/DCL
CS/RST
DIO/S1
INT
RSHB
RSLB
RSPB
BATH
BATL
BATP
6
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
CONNECTION DIAGRAM
4
3
2
1
32 31 30
5
6
29
28
27
26
25
24
23
22
21
R1
R2
SB
SA
7
RYE
R3
IMT
8
ILG
Le79R251
32-Pin PLCC
9
TMS
TMP
TMN
P1
CREF
RSVD
HPB
HPA
VTX
10
11
12
13
P2
14 15 16 17 18 19 20
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
I/O
Description
AD, BD
BGND
A, B Line Drivers
Ground
O
Provide the currents to the A and B leads of the subscriber loop.
Ground return for high and low battery supplies.
VCCD reference. It is the digital high logic supply rail, used by the ISLIC to ISLAC
interface.
CREF
+3.3 VDC
GND
Ground
Analog and digital ground return for VCC.
High-Pass Filter
Capacitor
Longitudinal Current
Sense
These pins connect to CHP, the external high-pass filter capacitor that separates
the DC loop-voltage from the voice transmission path.
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 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.
HPA, HPB
O
O
ILG
IMT
Metallic Current Sense
Register Load
O
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
LD
I
~V
± 0.3 V the control register contents are locked.
REF
P1–P3
R1
R2
Control Bus
I
Inputs to the latch for the operating-mode decoder and the relay-drivers.
Collector connection for relay 1 driver. Emitter internally connected to BGND.
Collector connection for relay 2 driver. Emitter internally connected to RYE
Collector connection for relay 3 driver. Emitter internally connected to RYE.
Relay 1 Driver
Relay 2 Driver
Relay 3 Driver
O
O
O
R3
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.
Receive Summing
Node
RSN
I
RSVD
RYE
Reserved
Relay 2, 3 Common
Emitter
This is used during Legerity testing. In the application, this pin must be left floating.
O
I
Emitter connection for R2 and R3. Normally connected to relay ground.
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.
A, B Lead Voltage
Sense
SA, SB
TMP, TMN,
TMS
External resistors connected from TMP to TMS and TMN to VBL to offload excess
power from the Le79R251 device.
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.
Thermal Management
Battery (Power)
VBH
VBL
Connection to low-battery supply used for short loops. When only a single negative
battery is available, this pin must be connected to VBH.
Battery (Power)
Positive Battery
(Power)
+5 V Power Supply
VBP
VCC
Used in Ringing State and for Extended Loop operation.
Positive supply for low voltage analog and digital circuits in the Le79R251 device.
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.
VLB
Longitudinal Voltage
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.
Scaled-down version of the voltage between the sense points SA and SB on this
pin.
1.4 V Analog
Reference
VREF
VSAB
I
Loop Voltage
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
4-Wire Transmit Signal
O
8
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
–55 to +150° C
–40 to +85° C
–0.4 to +7 V
+0.4 to –85 V
–0.4 to +85 V
Ambient temperature, under bias
V
V
V
V
with respect to GND
CC
BH
BP
BP
, V with respect to GND (see Note 2)
BL
with respect to GND
with respect to VBH
150 V
BGND with respect to GND
Voltage on R1 relay outputs
AD or BD to BGND:
Continuous
–3 to +3V
+7 V
V
V
V
V
– 1 to VBP + 1
– 5 to VBP + 5
– 10 to VBP + 10
– 15 to VBP + 15
BH
BH
BH
BH
10 ms (F = 0.1 Hz)
1 µs (F = 0.1 Hz)
250 ns (F = 0.1 Hz)
Current into SA or SB:
10 µs rise to Ipeak;
I
= ±5 mA
PEAK
PEAK
1000 µs fall to 0.5 Ipeak;
2000 µs fall to I =0
Current into SA or SB:
2 µs rise to Ipeak;
I
= ±12.5 mA
10 µs fall to 0.5 Ipeak;
20 µs fall to I = 0
SA SB continuous
5 mA
± 150 mA
–0.4 to VCC + 0.4 V
1000 V min
900 V
Current through AD or BD
P1, P2, P3, LD to GND
ESD Immunity (Human Body Model)
Charged device model
Maximum power dissipation, (See Note 1)
T = 70°C
1.67 W
A
T = 85°C 1.33 W
A
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
0 to 70°C Commercial
–40 to +85 °C extended temperature
Ambient Temperature
Ambient Relative Humidity
5 to 95%
Le79R251 ISLIC™ Data Sheet
9
P R E L I M I N A R Y
Electrical Ranges
VCC
VBL
VBH
VBP
5 V ± 5%
–15 V to VBH
–18 to –79 V
+79 to +8 V
140 V
Maximum supply voltage across device, VBP–VBH
BGND with respect to GND
Load resistance on VTX to Vref
Load resistance on VSAB to Vref
–100 to +100 mV
20 kΩ minimum
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
Case 1
Max
Case 2
Max
Description
Test Conditions
Unit
Typ
65
Typ
55
On-Hook Disconnect
85
80
On-Hook Standby
On-Hook Transmission
Fixed Longitudinal Voltage
110
210
140
270
90
170
120
220
ISLIC
ISLIC
Power Dissipation Normal
Polarity
mW
On-Hook Active High Battery
300
420
220
350
Off-Hook Active Low Battery
RL = 294 Ω
ISLIC
TMG
700
200
800
240
400
40
500
60
On-Hook Active Boost Battery
On-Hook Disconnect
600
970
660
1050
VBH
VBL
VCC
VBP
0.6
0.1
0.9
0.2
0.6
0.1
0.9
0.2
3.9
4.5
3.9
4.5
0.08
0.15
0.08
0.15
On-Hook Standby
VBH
VBL
VCC
VBP
1.3
0
4.3
0.12
1.7
0
1.3
0
4.3
0.12
1.7
0
5
5
0.3
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
mA
Power Supply Currents
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
3
2.2
27.5
8.2
3
30
11
0.2
30
11
0.2
0.10
0.10
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
10
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
DC Specifications
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.
30 k
Ω
30 k
390 pf
VREF
Ω
RT Network
No.
Item
Condition
Min
Typ
Max
Unit
Note
Standby mode, open circuit,
|VBH| < 55 V
|VBH| – 9
48
|VBH|–8
52
|VBH|–7
55
55
16.13
|VBH| > 55 V
GND – VB
Two-wire loop voltage,
including offset (V -V )
1
V
2
Any Active mode (does not
13.88
19.8
130
15
22
A
B
include OHT), RL = 600 Ω,
I
= 50 µA
RSN
OHT mode, RL = 2200 Ω,
I
= 20 µA
RSN
Feed resistance per leg at
pins AD & BD
2
3
Standby mode
250
375
40
Ω
Feed current
Feed current limit
IMT current
Standby mode, RL = 600 Ω
Standby mode, RL = 2200 Ω
Standby mode
18
44.6
30
56
mA
µA
ILG current
A to VBH
B to Ground
25.7
25.7
Low boundary
Medium boundary
High boundary
Input high current
Input low current
Mid-level current
Input high voltage
Input low voltage
Input high current
Input low current
0.6
VREF+0.3
V
V
V
µA
µA
µA
V
VREF–0.3
CREF – 1
–20
Ternary input voltage
boundaries for LD pin. Mid-
level input source must be
Vref.
4
5
20
20
20
2
2
2
–20
–20
2.0
0.6
20
20
V
Logic Inputs P1, P2, P3
–20
–20
–50
µA
µA
mV
6
7
8
VTX output offset
VREF input current
CREF input current
+50
VREF = 1.4 V, Active Low Battery
I
I
= -25 mA
= 0 mA
60
200
120
300
µA
µA
2
2
LOOP
LOOP
CREF = 3.3 V
1
10
β, DC Ratio of VSAB to
loop voltage:
9
Tj < 145°C, VSA – VSB = 22 V
0.00606
41
0.00667
0.00740
V/V
VSAB
β = ---------------------------
V
SA – VSB
Gain from VLB pin to A or B
pin
10
45
49
V/V
2
2
11
12
13
VLB pin input current
ILOOP/IMT
ILONG/ILG
VLB = VREF 1V
ILOOP = 10 mA
ILONG = 10 mA
–100
290
580
100
350
700
µA
A/A
A/A
300
600
Input current, SA and SB
pins
K1
ISA/IMT
ISB/ILG
VSAB output offset
IMT output offset
14
Active modes
1.0
3.0
µA
2
2
15
16
17
18
19
Incremental DC current gain
Disconnect, ISA = 2 mA
Disconnect, ISB = 2 mA
462
5.0
10
-20
–3
500
6
12
538
7
14
20
3
A/A
mV
µA
0
Le79R251 ISLIC™ Data Sheet
11
P R E L I M I N A R Y
No.
20
Item
ILG output offset
Condition
Min
–3
Typ
0
Max
3
Unit
µA
Note
Relay Driver Specifications
No.
Item
Condition
Min
Typ
Max
Unit
Note
25 mA/relay sink
40 mA/ relay sink
R2,R3 = BGND
RYE = VBH
Iz = 100 µA
Iz = 30 mA
0.4
0.8
0.5
1.0
1
On Voltage
V
µA
V
2
2
R2,R3 Off Leakage
0
100
3
4
Zener Break Over, R1
Zener On Voltage, R1
9
8.0
9.5
8.8
10.5
9.5
Figure 1. Relay Drivers
R3
R2
RYE
A. Relay Driver Configuration
R1
BGND
B. Ring Relay
Transmission Specifications
No.
Item
RSN input impedance
VTX output impedance
Condition
f = 300 to 3400 Hz
Min
Typ
1
3
Max
10
20
Unit
Note
2
1
Ω
2
3
4
Active High Battery, Active Low
Battery, Active Boosted Battery
Active mode
Max, AC + DC loop current
70
mA
2
Input impedance, A or B to GND
70
135
Ω
–10 dBm, 1 kHz, 0 to 70°C
–14.13 –13.98 –13.83
–14.18 –13.98 –13.78
5
6
2-4 wire gain
T = –40°C to 85°C
2
A
300 to 3400 Hz, relative to 1 kHz
–0.1
+0.1
2-4 wire gain variation with
frequency
T =–40°C to 85°C
–0.15
+0.15
2
5
A
–0.1
0
0
+0.1
+3 dBm to –55 dBm
Reference: –10 dBm
7
8
2-4 wire gain tracking
dB
T = –40 to 85°C
–0.15
+0.15
2, 5
2
A
–10 dBm, 1 kHz
–0.15
–0.2
0
0
+0.15
+0.2
4-2 wire gain
T = –40°C to 85°C
A
4-2 wire gain variation with
frequency
9
300 to 3400 Hz, relative to 1 kHz
–0.1
–0.1
+0.1
+0.1
+3 dBm to –55 dBm
Reference: –10 dBm
10
4-2 wire gain tracking
2, 5
12
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
Condition
No.
Item
Min
Typ
Max
Unit
Note
Total harmonic distortion level
2-wire
300 Hz to 3400 Hz
0 dBm
11.2 dBm
–12 dBm
–0.8 dBm
–50
–40
–48
–38
dB
dB
dB
dB
Vp
11
4-wire
4-wire overload level at VTX
RLOAD = 600 Ω
±1
2
Active modes, R = 600 Ω
Idle channel noise
C-message
Weighted
Psophometric
Weighted
L
+7
–7
–83
–97
+11
–79
dBrnC
dBmp
2-wire
4-wire
2-wire
4-wire
12
L - T
200 to 1000 Hz
T = –40°C to 85°C
1000 to 3400 Hz
T = –40°C to 85°C
58
53
53
48
63
2
2
A
Longitudinal balance
(IEEE method)
Normal Polarity
58
A
13
14
T - L
L - T
L - T
200 to 3400 Hz
IL = 50 to 3400 Hz
200 to 1000 Hz
40
63
2
dB
50
48
Reverse Polarity
T = –40°C to 85°C
A
50 to 3400 Hz
3.4 K to 50 kHz
50 to 3400 Hz
3.4 K to 50 kHz
F = 15 to 60 Hz Active mode
Freq = 12 kHz 2.8 Vrms
Freq = 16 kHz
25
25
20
40
45
40
45
35
30
3,4
1, 2, 4
3, 4
1, 2, 4
2
PSRR (VBH, VBL, VBP)
15
16
PSRR (VCC)
Longitudinal AC current per wire
mArms
dB
17
Metering distortion
56
2
metering load = 200 Ω
Ringing Specifications
No.
Item
Condition
Active Internal Ringing
Min
(VBP-VBH) - 10 V
Typ
Max
133
Unit
V
Note
7
1
Peak Ringing Voltage
Current-Limit Behavior
No.
SLIC Mode
Condition
Min
Typ
Max
Unit
Note
Applied fault between ground and T/R
VBH applied to Tip or Ring
1
µA
A
1
Disconnect
100
6
VBH/200K
2
3
4
Tip Open
Short to GND
Short Tip-to-VBH
Short Ring-to-GND
ISLAC generating internal ringing
30
30
30
100
40
45
40
Standby
mA
Active Ringing
Thermal Shutdown Fault Indications
No.
Fault
Indication
1
2
No Fault
Thermal Shutdown
ILG, IMT operates normally (Vref ±1V)
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
Connection
to RMGPi &
Battery Voltage
Selection
RMGLi
C3
C2
C1
Operating Mode
Operating Mode
Resistors
Notes
(High ohmic feed): Loop
supervision active, A and B
amplifiers shut down
Tip Open: AD at High-
Impedance, Channel A power
amplifier shut down
High Battery (BATH)
and BGND
0
0
0
Standby
Open
Open
1
High Battery (BATH)
and BGND
0
0
0
1
1
0
Tip Open
1
On-Hook
Transmission,
Fixed Longitudinal
Voltage
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
Low Battery selection
at VBL
0
1
1
0
1
0
Disconnect
High Battery (BATH)
and Positive Battery
(BATP)
High Battery (BATH)
and BGND
A and B
Amplifier
Output
Active Boosted
Battery
Active feed, normal or reverse
polarity
1
1
0
1
1
0
Active High Battery
Active Low Battery
Low Battery (BATL)
and BGND
High Battery (BATH)
and Positive Battery
(BATP)
Active Internal
Ringing
1
1
1
Active internal ringing
Note:
1. In these modes, the ring lead (B-lead) output has a –50 V internal clamp to battery ground (BGND).
14
Le79R251 ISLIC™ Data Sheet
P R E L I M I N A R Y
Operating Mode Descriptions
Operating Mode
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
Disconnect
VSA
----------
400
VSB
400
currents are scaled to produce voltages across RMTi and RLGi of
and ---------- , respectively.
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.
Standby
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.
Tip Open
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.
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 High Battery
Active Low 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 Boosted
Battery
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.
Active Internal
Ringing
On-Hook
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.
Transmission
(OHT), Fixed
Longitudinal
Voltage
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
Description
A logic 1 on RD1 turns the R1 driver on and operates a relay connected between the R1 pin and VCCD. R1
R1
R2
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.
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.
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.
R3
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:
I < 7.5 mA
L
TMG resistor-current is limited to be 7.5 mA < I . If I < 7.5 mA,
no current flows in the TMG resistor and it all flows in the
Le79R251.
L
L
P
= (S
– I (R + 2R
)) • I + 0.3 W
SLIC
BAT
L
L
FUSE
L
PT
= 0
RTMG
These equations are valid when
R
• (I – 7.5 mA) < (S
– (R + R )I ) / 2 – 2
TMG
L
BAT F L L
I > 7.5 mA
L
because the longitudinal voltage is one-half the battery voltage
and the TMG switches require approximately 2 V.
R
P
= (S
– I (R + 2R
)) / (2(I – 7.5 mA))
)) + 0.3 W – PT
FUSE RTMG
TMG
SLIC
BAT
L
L
FUSE
L
To choose a power rating for RTMG:
= I (S
– I (R + 2R
L
BAT
L
L
P
> PT
/ 2
RATING
RTMG
2
PT
= (I – 7.5 mA) (2R
)
RTMG
L
TMG
Note that for reliable operation, P
1.33 W.
should be less than
SLIC
TIMING SPECIFICATIONS
Symbol
trSLD
tfSLD
tSLDPW
tSDXSU
tSDXHD
tSDXD
Signal
Parameter
Min
Typ
Max
2
2
Unit
LD
LD
LD
Rise time Le79R251 device LD pin
Fall time Le79R251 device LD pin
LD minimum pulse width
P1–3 data Setup time
P1–3 data hold time
Max P1–3 data delay
3
4.5
4.5
µs
P1,P2,P3
P1,P2,P3
P1,P2,P3
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
R
Write State Register
Lock Registers
VCC
VREF
LD
0V
Write Relay Register
New State
Data
Previous
Relay Data
State Data
Relay Data
P1,P2,P3
DETAIL A
VREF
VREF
Write State Register
Write Relay Register
trSLD
tfSLD
LD
tSLDPW
tSDXHD
tSDXSU
P1,P2,P3
Relay driver
response
tSDXD
Le79R251 ISLIC™ Data Sheet
17
P R E L I M I N A R Y
APPLICATION CIRCUIT
Internal Ringing Line Card Schematic
+5V
3.3V
VCC
CREF
RSAi
RFAi
RRXi
SA
AD
RSN
VOUTi
DGND
AGND
RHLai
CHLbi
A
RHLbi
VHLi
RHLci
RTi
RHLdi
CHLdi
U3
U5
VREF
CADi
CHPi
VCCA
VCCD
VCC
+3.3VDC
VSAB
VTX
VSABi
VINi
HPA
HPB
BD
CS1
U4
CS2
U6
BATP
BATH
DT1i
CSSi
RFBi
RSBi
B
VLB
IMT
VLBi
VIMTi
SB
CBDi
TMS
RMTi
U1
Am79R251
RTEST
U2
ISLAC
VREF
RMGPi
ILG
VILGi
BACK
TMP
TMN
PLANE
DT2i
RLGi
VREF
RMGLi
DHi
DLi
VREF
VREF
BATH
VBH
VBL
BATL
LD
LDi
P1
SBP
BATP
BATL
BATH
GND
RSPB
RSLB
RSHB
CBATHi
CBATPi
CBATLi
P1
P2
P3
SLB
SHB
P2
P3
VBP
RYE
R2
BATP
IREF
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
U2
Le79R251 device
Am79X22xx
B1100CC
B2100CC
Diode
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
ISLIC device
ISLAC device
TECCOR Battrax protector
TECCOR Battrax protector
50 ns
U3, U4
U5, U6
DHi, DLi, DT1i, DT2i
RFAi, RFBi
RSAi, RSBi
RTi
RRXi
RREF
RMGLi, RMGPi
RSHB, RSLB
RHLai
RHLbi
RHLci
RHLdi
CHLbi
CHLdi
RMTi
RLGi
RTEST
100 V
100 V
100 V
2 W
1/4 W
1/10 W
1/10 W
1/10 W
1 W
1/8 W
1/10 W
1/10 W
1/10 W
1/10 W
10 V
100 mA
50 Ω
200 kΩ
80.6 kΩ
90 kΩ
2%
2%
1%
1%
1%
5%
1%
1%
1%
1%
1%
10%
10%
1%
1%
1%
Fusible PTC protection resistors
Sense resistors
69.8 kΩ
1 kΩ
Current reference
Thermal management resistors
750 kΩ
40.2 kΩ
4.32 kΩ
2.87 kΩ
2.87 kΩ
3.3 nF
0.82 µF
3.01 kΩ
6.04 kΩ
2 kΩ
Capacitor
Capacitor
Resistor
Resistor
Resistor
Not Polarized
Ceramic
10 V
1/8 W
1/8 W
1 W
Test board
1
Capacitor
Capacitor
Capacitor
Capacitor
22 nF
10%
20%
20%
20%
100 V
100 V
100 V
100 V
Ceramic, not voltage sensitive
Ceramic
Ceramic
CADi, CBDi
CBATHi, CBATLi, CBATPi
100 nF
22 nF
CHPi
1
100 nF
Protector speed up capacitor
CS1i, CS2i
3
Capacitor
56 pF
5%
100 V
Ceramic
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
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