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. 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