SMSC DS – TMC2005

Rev. 10/24/2000

TMC2005

PRELIMINARY

5 Port HUB Controller Device

FEATURES

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HUB Circuit for ARCNET Protocol (Data Rate

From 156.25Kbps to 10Mbps)

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Able to Connect Various Transceivers Directly

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Device Includes TX/RX Timing Circuit for 5 Port

Hub and Direction Control Circuit, Jitter Correct

Circuit and Noise Cancel Circuit

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Easy to Design 8 or 12 Port Hub

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Can Connect with HYC9068 or HYC9088 in

Normal Mode

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Can Connect with RS485 Transceiver,

HYC2485S, HYC2488S, Opt Module and TTL

Interface in Backplane Mode

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Supports both Normal and Backplane Mode at the

Same Time for Media Conversion

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+ 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.