AM79R251JC Advanced Micro Devices, AM79R251JC Datasheet

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Intelligent Access Am79R251 Intelligent Subscriber Line Interface Circuit (ISLIC DISTINCTIVE CHARACTERISTICS Monitor of two-wire interface voltages and currents supports — Voice transmission — Through chip ring generation — Programmable DC feed characteristics — Independent of battery — Current limited — ...

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TABLE OF CONTENTS Distinctive Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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The Am79R251, in combination with an ISLAC 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 ...

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BLOCK DIAGRAMS Figure 1. Example Four-Channel Linecard Block Diagram 4 Am79R251 ...

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Figure 2. Am79R251 Block Diagram IA sense 600 SA Fault Meas. HPA Active High Voltage VBP Power Amplifiers TMS Positive Supply BGND HPB Fault Meas sense BD IB 600 TMN Thermal Management Control TMP ...

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ORDERING INFORMATION AMD standard products are available in several packages and operating ranges. The ordering number (valid combination) is formed by a combination of the elements below. An ISLAC device must be used with this part. Am79R251 J Valid Combinations ...

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CONNECTION DIAGRAM RYE TMS TMP TMN Am79R251 9 32-Pin PLCC Am79R251 29 SB ...

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PIN DESCRIPTIONS Pin Pin Name I/O AD Line Drivers O BGND Ground CREF +3.3 VDC GND Ground HPA, HPB High-Pass Filter O Capacitor ILG Longitudinal Current O Sense IMT Metallic Current Sense O LD Register Load P1–P3 ...

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GENERAL DESCRIPTION The Intelligent Access voice chipsets integrate all functions of the subscriber line. Two chip types are used to implement the linecard; an Am79R251 device and an ISLAC device. These provide the following basic functions: 1. The Am79R251: A ...

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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 ...

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INTELLIGENT ACCESS ™ Figure 3. Internal Ringing Linecard Schematic RSAi RFAi RTESTMi CS1 CS2 BATP BATH DT1i U4 U6 RFBi B RSBi CBDi DT2i RMGPi RMGLi DHi BATH DLi BATL CBATHi CBATLi CBATPi BATP RTESTLi VOICE CHIPSETS ...

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Figure 4. External Ringing Linecard Schematic RSAi RFAi A KRi( RTESTMi CS1 CS2 BATH BATP DT1i U4 U6 RFBi B RSBi KRi (B) DT2i RMGPi RMGLi DHi BATH DLi BATL CBATHi CBATLi CBATPi BATP RTESTLi RGFDLi KRi +5V ...

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LINECARD PARTS LIST The following list defines the parts and part values required to meet target specification limits for channel i of the linecard (i = 1,2,3,4). Item Type U1 Am79R251 U2 Am79X22xx U3, U4 P1001SC U5, U6 — D1, ...

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ELECTRICAL CHARACTERISTICS Power Dissipation Loop resistance = 0 to BATL = -40 V, BATH = –68 V, BATP = +52 V, VCC = +5 V. For power dissipation measurements, DC-feed conditions are as follows: • ILA (Active mode current limit) ...

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Thermal Resistance The junction to air thermal resistance of the Am79R251 in a 32-pin, PLCC package is 45°C/W. The typical junction to case thermal resistance is 14°C/W. Measured under free air convection conditions and without external heatsinking. Absolute Maximum Ratings ...

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Electrical Maximum Ranges VCC VBL VBH VBP Maximum supply voltage across device, VBP–VBH BGND with respect to GND Load resistance on VTX to Vref Load resistance on VSAB to Vref Note: Vloopmax: Maximum expected loop voltage in application; I Vpk: ...

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SPECIFICATIONS Target Specifications (See note 1) No. Item 1 Two-wire loop voltage Standby mode, open circuit, (including offset) |VBH| < |VBH| > Any Active mode (does not include OHT 600 , I OHT mode, ...

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Relay Driver Specifications Item On Voltage R2,R3 Off Leakage Zener Break Over, R1 Zener On Voltage, R1 Figure 5. Relay Driver Configuration R2 Figure 5A. Ring Relay 18 Condition Min Typ 25 mA/relay sink 1 relay on 0.225 3 relays ...

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Am79R251 Transmission Specifications No. Item 1 RSN input impedance 2 VTX output impedance 3 Max loop current 4 Input impedance GND 5 2-4 wire gain 6 2-4 wire gain variation with frequency 7 ...

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Am79R251 Ringing Specifications Item Peak Ringing Voltage Am79R251 Current-Limit Behavior SLIC Mode Disconnect Applied fault between ground and T/R VBH applied to Tip or Ring Tip Open Short to GND Standby Short Tip-to-VBH Short Ring-to-GND Active Ringing ISLAC generating internal ...

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Operating Modes The Am79R251 receives multiplexed control data on the P1, P2 and P3 pins. The LD pin then controls the loading of P1, P2, and P3 values into the proper bits in the Am79R251 control register. When the LD ...

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Table 2. Mode Descriptions Operating Mode Disconnect 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 Am79R251 selects the low battery voltage at the ...

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Control bits RD1, RD2, and RD3 do not affect the operating mode of the Am79R251. These signals usually perform the following functions. Table 3. Driver Descriptions Driver R1 A logic 1 on RD1 turns the R1 driver on and operates ...

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TIMING SPECIFICATIONS Symbol trSLD LD tfSLD LD tSLDPW LD tSDXSU P1,P2,P3 tSDXHD P1,P2,P3 tSDXD P1,P2,P3 Notes: – 1. The P1 3 pins are updated continuously during operation by the LD signal. 2. After a power-on reset or hardware reset, the ...

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WAVEFORMS VCC VREF LD 0V Previous Relay Data P1,P2,P3 VREF tr SLD LD VREF t SDXSU P1,P2,P3 Relay Data State Data DETAIL A tf SLD t SLDPW t SDXHD Am79R251 Write State Register Lock Registers Write Relay Register New Relay ...

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PHYSICAL DIMENSIONS PL032 .485 .495 .447 .453 .585 Pin 1 I.D. .595 .547 .553 .026 .032 TOP VIEW REVISION SUMMARY Revision A to Revision B • Revision A was a condensed version of the datasheet while Revision B contains the ...

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... The contents of this document are provided in connection with Advanced Micro Devices, Inc. ("AMD") products. AMD 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 speci- fications and product descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any in- tellectual property rights is granted by this publication. Except as set forth in AMD’ ...