TMC2005
PRELIMINARY
5 Port HUB Controller Device
FEATURES
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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
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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
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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
Rev. 10/24/2000
SMSC [ SMSC CORPORATION ]
