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COM20020
COM20020 ULANC
Universal Local Area Network Controller
with 2K x 8 On-Board RAM
FEATURES
• 24-Pin Embedded Network Controller/
Transceiver/RAM
• Ideal for Industrial/Factory Automation
and Automotive Applications
• Deterministic, 2.5 Mbps, Token Passing
ARCNET Protocol
• Minimal Microcontroller and Media
Interface Logic Required
• Flexible Microcontroller Interface for Use
with 80XX, 68XX, etc.
• Automatically Detects Type of
Microcontroller Interface:
- Non-Multiplexed or Multiplexed Bus
- Separate nRD & nWR Lines or DIR &
nDS Lines
• Full 2Kx8 On-Chip RAM
• Command Chaining for Top Performance
• Reduced Reconfiguration Times
• Sequential Access to Internal RAM
• Software Programmable Node ID
• Duplicate Node ID Detection
• Powerful Diagnostics
• Receive All Mode
• Data Rates from 2.5 Mbps to 156.25 Kbps
• 24-Pin DIP or 28-Pin PLCC Package
• Flexible Media Interface:
- Traditional Hybrid Interface for Long
Distances
- RS485 Differential Driver Interface for
Low Cost, Low Power, High Reliability
- Backplane Mode for Direct Connection to
Media in Short Distance Applications
• Eight, 256-Byte Pages Allow 4 Pages TX
and RX Plus Scratch-Pad Memory
• No Wait-State Arbitration
• Programmable TXEN Polarity
• Next ID Readable
• Internal Clock Prescaler for Slower Network
Speed without Slowing Arbitration
• Operating Temperature Range of -40
o
C to
+85
o
C, or 0
o
C to +70
o
C
• Self-Reconfiguration Protocol
• Supports up to 255 Nodes
• Supports Various Network Topologies (Star,
Tree, Bus...)
• CMOS, Single +5V Supply
GENERAL DESCRIPTION
SMSC's COM20020 is a member of the family
of Industrial Network Controllers from Standard
Microsystems Corporation. The device is a
special purpose communications controller for
networking microcontrollers and intelligent
peripherals in industrial, automotive, and
embedded control environments using an
ARCNET
®
protocol engine. The small 24-pin
package, flexible microcontroller and media
interfaces, eight-page message support, and
extended temperature range of the COM20020
make it the only true network