COM20020I Rev D
5Mbps ARCNET (ANSI
878.1) Controller with
2K x 8 On-Chip RAM
Datasheet
Product Features
Eight, 256 Byte Pages Allow Four Pages TX
and RX Plus Scratch-Pad Memory
New Features for Rev. D
− Data Rates up to 5 Mbps
− Programmable Reconfiguration Times
Next ID Readable
28 Pin PLCC and 48 Pin TQFP Packages;
Lead-free RoHS Compliant Packages also
Available
Ideal for Industrial/Factory/Building
Automation and Transportation Applications
Deterministic, (ANSI 878.1), Token Passing
ARCNET Protocol
Minimal Microcontroller and Media Interface
Logic Required
Internal Clock Scaler and Clock Multiplier for
Adjusting Network Speed
Operating Temperature Range of -40oC to
+85oC
Self-Reconfiguration Protocol
Supports up to 255 Nodes
Supports Various Network Topologies (Star,
Tree, Bus...)
CMOS, Single +5V Supply
Flexible Interface For Use With All
Microcontrollers or Microprocessors
Duplicate Node ID Detection
Powerful Diagnostics
Automatically Detects Type of
Microcontroller Interface
Receive All Packets Mode
2Kx8 On-Chip Dual Port RAM
Flexible Media Interface:
Command Chaining for Packet Queuing
− Traditional Hybrid Interface For Long
Distances up to Four Miles at 2.5 Mbps
− RS485 Differential Driver Interface For Low
Cost, Low Power, High Reliability
Sequential Access to Internal RAM
Software Programmable Node ID
ORDERING INFORMATION
Order Numbers:
COM20020ILJP for 28 pin PLCC package
COM20020I-DZD for 28 pin PLCC lead-free RoHS compliant package
COM20020I-HD for 48 pin TQFP package
COM20020I-HT for 48 pin TQFP lead-free RoHS compliant package
SMSC COM20020I Rev D
Page 1
DATASHEET
Revision 12-05-06
