COM20020I Rev D
5Mbps ARCNET (ANSI
878.1) Controller with
2K x 8 On-Chip RAM
Datasheet
Product Features
New Features for Rev. D
−
Data Rates up to 5 Mbps
−
Programmable Reconfiguration Times
Eight, 256 Byte Pages Allow Four Pages TX
and RX Plus Scratch-Pad Memory
Next ID Readable
Internal Clock Scaler and Clock Multiplier for
Adjusting Network Speed
Operating Temperature Range of -40
o
C to
+85
o
C
Self-Reconfiguration Protocol
Supports up to 255 Nodes
Supports Various Network Topologies (Star,
Tree, Bus...)
CMOS, Single +5V Supply
Duplicate Node ID Detection
Powerful Diagnostics
Receive All Packets Mode
Flexible Media Interface:
−
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
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
Flexible Interface For Use With All
Microcontrollers or Microprocessors
Automatically Detects Type of
Microcontroller Interface
2Kx8 On-Chip Dual Port RAM
Command Chaining for Packet Queuing
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
Revision 12-05-06
DATASHEET