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Details, datasheet, quote on part number:821621
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Datasheet text preview:
IDT821621
LONG HAUL SLIC
LONG HAUL SLIC IDT821621
Version December 18, 2002
2975 Stender Way, Santa Clara, California 95054 Telephone: (800) 345-7015 · · FAX: (408) 492-8674 Printed in U.S.A. © 2002 Integrated Device Technology, Inc.
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
DISCLAMER Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent, patent rights or other rights, of Integrated Device Technology, Inc.
LIFE SUPPORT POLICY Integrated Device Technology's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is executed between the manufacturer and an officer of IDT. 1. Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any components of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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*Notice: The information in this document is subject to change without notice
December 18, 2002
LONG HAUL SLIC
ADVANCE INFORMATION IDT821621
FEATURES
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DESCRIPTION
The IDT821621 is a long haul Subscriber Line Interface Circuit. It implements the basic telephone line interface functions such as battery feeding, impedance matching, off-hook detection and ring-trip detection. The IDT821621 allows battery feeding between -19 V and -58 V and has the capability for driving long loops. The architecture of operating the SLIC in different states according to different loop states minimizes the system power dissipation. This long haul SLIC is pin-to-pin compatible with AMD7920. It provides a cost-effective solution for PBX and Central Office applications.
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SLIC operating states: Active, Ringing, Standby and Disconnect Low Standby power consumption (35 mW) -19 V to -58 V battery operation On-hook transmission Two-wire impedance set by single external impedance Programmable constant-current feed Programmable loop-detect threshold Programmable ring-trip detect threshold +3.3 V / +5 V compatible power supply No -5 V supply required On-chip Thermal Management (TMG) Four on-chip relay drivers and relay snubbers, 1 ringing and 3 general purpose Package available: 32 pin PLCC
FUNCTIONAL BLOCK DIAGRAM
TM G
Rel ay Driver Rel ay Driver Rel ay Driver A (TIP) Ri n g Relay Driver HP A Di g i tal I n te r fa c e T wo -Wi re I n ter face S i g n al T ran sm i ssi o n HP B O ff-h o o k Detecto r B (RING) P o wer Feed C o n tr o l l e r DA DB V BA T BG ND V CC
The IDT an the IDT logo are registered trademarks of Integrated Device Technology, Inc.
RYO UT 3 RYO UT 2 RYO UT 1 R I N G O UT D1 D2 D3 C1 C2 DE T V TX RS N
RD R DC C AS Ri n g -tr i p Detecto r
V BR E F
AG ND
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2002 Integrated Device Technology, Inc. *Notice: The information in this document is subject to change without notice
December 18, 2002
DSC-6225/-
Table of Contents
Features ...... 1 Description .......... 1 Functional Block Diagram ......... 1 Pin Configuration...... 5 Pin Description ......... 6 Functional Description...... 7 SLIC States Control ......... 7 Off-hook Detector.... 7 Ring-trip Detector .... 7 Relay Drivers Control ....... 8 DC Feeding ............. 8 Impedance Matching........ 9 Receive Gain Setting ....... 9 Thermal Management ...... 9 DC Electrical Characteristics......... 10 AC Electrical Characteristics......... 11 Test Circuits ............ 15 Basic Application Circuit ......... 18 Ordering Information....... 19
Table of Contents
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*Notice: The information in this document is subject to change without notice
December 18, 2002
List of Figures
Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Loop-Detect Threshold Setting ..... 7 Ring-trip Detection .............. 8 Relay Drivers Schematic...... 8 DC Feeding Characteristics .......... 8 DC Feed Programming Circuit...... 8 Two-Wire AC Input Impedance Programming Network ..... 11 Two-Wire Return Loss ....... 15 Longitudinal Balance.......... 15 Four-Wire Longitudinal Signal Generation.......... 16 Two-to-Four Wire Gain ...... 16 Four-to-Two Wire Gain and Four-to-Four Wire Gain ......... 17 Loop Detector Switching .... 17 Basic Application Circuit .... 18
List of Figures
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*Notice: The information in this document is subject to change without notice
December 18, 2002
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