obsolescence notice this product is obsolete. this information is available for your convenience only. for more information on zarlink?s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/
9-113 9-113 not recommended f or ne w design see mt9171/72 features ? full duplex transmission over a single twisted pair ? selectable 80 or 160 kbit/s line rate ? adaptive echo cancellation ? up to 3km (8971b) and 4 km (8972b) ? isdn compatible (2b+d) data format ? transparent modem capability ? frame synchronization and clock extraction ? mitel st-bus compatible ? low power (typically 50 mw), single 5v supply applications ? digital subscriber lines ? high speed data transmission over twisted wires ? digital pabx line cards and telephone sets ? 80 or 160 kbit/s single chip modem figure 1 - functional block diagram dsti/di cdsti/ f0/ cld c4/ tck f0o/ rck ms0 ms1 ms2 regc dsto/do cdsto/ cdo transmit interface prescrambler scrambler control register transmit/ clock receive timing & control status transmit timing master clock phase locked sync detect receive dpll receive interface de - prescrambler descrambler differentially encoded biphase receiver differentially encoded biphase transmitter transmit filter & line driver receive filter -1 +2 mux address echo canceller error signal echo estimate v bias v dd v ss v bias v ref l out l out dis precan l in osc2 osc1 + ? cdi issue 7 may 1995 description the mt8971b (dsic) and MT8972B (dnic) are multi-function devices capable of providing high speed, full duplex digital transmission up to 160 kbit/s over a twisted wire pair. they use adaptive echo-cancelling techniques and transfer data in (2b+d) format compatible to the isdn basic rate. several modes of operation allow an easy interface to digital telecommunication networks including use as a high speed limited distance modem with data rates up to 160 kbit/s. both devices function identically but with the dsic having a shorter maximum loop reach speci?cation. the generic "dnic" will be used to reference both devices unless otherwise noted. the mt8971b/72b is fabricated in mitels iso 2 - cmos process. ordering information mt8971be 22 pin plastic dip MT8972Be 22 pin plastic dip MT8972Bc 22 pin ceramic dip mt8971bp 28 pin plcc MT8972Bp 28 pin plcc -40 c to + 85 c mt8971b/72b digital subscriber interface circuit digital network interface circuit iso 2 -cmos st-bus ? family
mt8971b/72b 9-114 notes:
www.zarlink.com information relating to products and services furnished herein by zarlink semiconductor inc. or its subsidiaries (collectively ?zarlink?) is believed to be reliable. however, zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from t he application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. neither the supply of such information or purchase of product or service conveys any license, either express or implied, u nder patents or other intellectual property rights owned by zarlink or licensed from third parties by zarlink, whatsoever. purchasers of products are also hereby notified that the use of product in certain ways or in combination with zarlink, or non-zarlink furnished goods or services may infringe patents or other intellect ual property rights owned by zarlink. this publication is issued to provide information only and (unless agreed by zarlink in writing) may not be used, applied or re produced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. the products, t heir specifications, services and other information appearing in this publication are subject to change by zarlink without notice. no warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. it is the user?s responsibility t o fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not b een superseded. manufacturing does not necessarily include testing of all functions or parameters. these products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. all products and materials are sold and services provided subject to zarlink?s conditi ons of sale which are available on request. purchase of zarlink?s i 2 c components conveys a licence under the philips i 2 c patent rights to use these components in and i 2 c system, provided that the system conforms to the i 2 c standard specification as defined by philips. zarlink, zl and the zarlink semiconductor logo are trademarks of zarlink semiconductor inc. copyright zarlink semiconductor inc. all rights reserved. technical documentation - not for resale for more information about all zarlink products visit our web site at
|
