COM20020ID
COM20020 ULANC
Revision D
Universal Local Area Network Controller
with 2K x 8 On-Board RAM
FEATURES
New Features for Rev. D
Data Rates up to 5 Mbps
Programmable Reconfiguration Times
24 Pin DIP, 28 Pin PLCC, 48 Pin TQFP
Packages
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
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
o
Operating Temperature Range of -40 C to
o
+85 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 2.5Mbps.
RS485 Differential Driver Interface For
Low Cost, Low Power, High Reliability
GENERAL DESCRIPTION
SMSC's COM20020ID is a member of the family
of Embedded ARCNET Controllers from Standard
Microsystems Corporation. The device is a
general purpose communications controller for
networking microcontrollers and intelligent
peripherals in industrial, automotive, and
embedded control
environments
using an
®
protocol engine. The small 24 pin
ARCNET
package, flexible microcontroller and media
interfaces, eight- page message support, and
extended temperature range of the COM20020ID
make it the only true network controller optimized
for use in industrial, embedded, and automotive
applications. Using an ARCNET protocol engine
is the ideal solution for embedded control
applications because it provides a deterministic
token-passing protocol, a highly reliable and
