COM20020I Rev D
Universal Local Area
Network Controller with
2K x 8 On-Board 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
24 Pin DIP, 28 Pin PLCC, 48 Pin TQFP
Packages
Internal Clock Scaler and Clock Multiplier for
Adjusting Network Speed
Ideal for Industrial/Factory/Building
Automation and Transportation Applications
Operating Temperature Range of -40oC to
+85oC
Deterministic, (ANSI 878.1), Token Passing
ARCNET Protocol
Minimal Microcontroller and Media Interface
Logic Required
Flexible Interface For Use With All
Microcontrollers or Microprocessors
Self-Reconfiguration Protocol
Supports up to 255 Nodes
Supports Various Network Topologies (Star,
Tree, Bus...)
CMOS, Single +5V Supply
Duplicate Node ID Detection
Automatically Detects Type of
Microcontroller Interface
Powerful Diagnostics
Receive All Packets Mode
2Kx8 On-Chip Dual Port RAM
Command Chaining for Packet Queuing
Flexible Media Interface:
Sequential Access to Internal RAM
− Traditional Hybrid Interface For Long
Distances up to Four Miles at 2.5Mbps.
− RS485 Differential Driver Interface For Low
Cost, Low Power, High Reliability
Software Programmable Node ID
ORDERING INFORMATION
Order Number(s):
COM20020I-LJP for 28 pin PLCC package
COM20020I-P for 24 pin DIP package
COM20020I-HD for 48 pin TQFP package
SMSC COM20020I Rev D
Page 1
DATASHEET
Rev. 04-15-05
