SMSC DS TMC2005

Rev. 10/24/2000

TMC2005

PRELIMINARY

5 Port HUB Controller Device

FEATURES

HUB Circuit for ARCNET Protocol (Data Rate
From 156.25Kbps to 10Mbps)

Able to Connect Various Transceivers Directly

Device Includes TX/RX Timing Circuit for 5 Port
Hub and Direction Control Circuit, Jitter Correct
Circuit and Noise Cancel Circuit

Easy to Design 8 or 12 Port Hub

Can Connect with HYC9068 or HYC9088 in
Normal Mode

Can Connect with RS485 Transceiver,
HYC2485S, HYC2488S, Opt Module and TTL
Interface in Backplane Mode

Supports both Normal and Backplane Mode at the
Same Time for Media Conversion

+ 5V Single Power

GENERAL DESCRIPTION

When configuring a network, the maximum number of nodes and the maximum cable length are limited by the
electric capacity of the transceiver. In this case, the network is expanded by an equipment called a "HUB" or
"repeater". It maybe necessary to have a converter between coax, T/P and the fiber cable. It is easy to design a
HUB or a repeater because the TMC2005 has various features for expanding such network.

It can connect with HYC9088 and HYC9068, RS485 transceiver, HYC2485S, HYC2488S and TTL interface for
optical module. It can connect with three different transceivers at the same time and convert the media of each.
(The data rate cannot be converted. It is necessary to operate all nodes in the same network at the same data
rate). The Hubs can be expanded by connecting two or more TMC2005 chips. By setting one of 5 ports to open-
drain output. The Hub can be expanded to either 12 or 16 ports.

SMSC DS TMC2005

Page 2

Rev. 10/24/2000

80 Arkay Drive
Hauppauge, NY 11788
(631) 435-6000
FAX (631) 273-3123

Standard Microsystems is a registered trademark of Standard Microsystems Corporation, and SMSC is a trademark of Standard Microsystems
Corporation. Product names and company names are the trademarks of their respective holders. Circuit diagrams utilizing SMSC products are
included as a means of illustrating typical applications; consequently complete information sufficient for construction purposes is not necessarily
given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves
the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the
latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the semiconductor
devices described any licenses under the patent rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and
conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale
Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from
published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in
any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such
uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC's website at
http://www.smsc.com.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT, AND ANY AND ALL WARRANTIES
ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE.

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OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON
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ANY REMEDY IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE; AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

SMSC DS TMC2005

Page 3

Rev. 10/24/2000

TABLE OF CONTENTS

FEATURES......................................................................................................................................................................................... 1
GENERAL DESCRIPTION ................................................................................................................................................................ 1
PIN CONFIGURATION ...................................................................................................................................................................... 4
BLOCK DIAGRAM............................................................................................................................................................................. 5
DESCRIPTION OF PIN FUNCTIONS ............................................................................................................................................... 6

TX/RX Interface............................................................................................................................................................................ 8
Operating Mode Setup............................................................................................................................................................... 9
PLL................................................................................................................................................................................................ 9
Other Signals ............................................................................................................................................................................10

OPERATIONAL DESCRIPTION.....................................................................................................................................................11

Direction Determination..........................................................................................................................................................11
Direction Release ....................................................................................................................................................................11
Jitter Filter...................................................................................................................................................................................11
Option Feature for Jitter Filtering ...........................................................................................................................................12

APPLICATION NOTES ...................................................................................................................................................................13
PORT GROUP .................................................................................................................................................................................21

Various Setup............................................................................................................................................................................21
Example For Operation Mode Setup To Each Port ............................................................................................................21
Note for Unused port ...............................................................................................................................................................21
Example for Power-On Reset Circuit....................................................................................................................................21

CONNECTING THE TMC2005 WITH INTERNAL PLL................................................................................................................22

Method To Connect A Crystal Clock......................................................................................................................................23

CASCADING CONNECTION ..........................................................................................................................................................23

Ring Network With the TMC2005 ..........................................................................................................................................27

OPERATIONAL DESCRIPTION.....................................................................................................................................................29

MAXIMUM GUARANTEED RATINGS* ...................................................................................................................................29
STANDARD OPERATING CONDITION ................................................................................................................................29
DC CHARACTERISTIC - INPUT PIN.....................................................................................................................................29
DC CHARACTERISTIC - OUTPUT PIN ................................................................................................................................30
AC CHARACTERISTIC - CLOCK and RESET.....................................................................................................................30

TMC2005 60 PIN QFP PACKAGE OUTLINE...............................................................................................................................31

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