Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete
information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no
responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without
notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does
not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC
or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard
Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request.
SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause
or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further
testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale
Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems
Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND
ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY
DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR
REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC
OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO
HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
Rev. 09-25-07
Page 2
SMSC COM20019I
PRODUCT PREVIEW
General Description
SMSC's COM20019I 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 ARCNET protocol engine. The flexible microcontroller and media interfaces, eight- page message
support, and extended temperature range of the COM20019I 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 proven networking scheme, and a data rate of up to 312.5 Kbps
when using the COM20019I.
A token-passing protocol provides predictable response times because each network event occurs within a
predetermined time interval, based upon the number of nodes on the network. The deterministic nature of
ARCNET is essential in real time applications. The integration of the 2Kx8 RAM buffer on-chip, the
Command Chaining feature, the maximum data rate, and the internal diagnostics make the COM20019I
the highest performance embedded communications device available. With only one COM20019I and one
microcontroller, a complete communications node may be implemented.
SMSC COM20019I
Page 3
Rev. 09-25-07
PRODUCT PREVIEW
Block Diagram
A0/nMUX
A1
A2/BALE
ADDRESS
DECODING
CIRCUITRY
2K x 8
RAM
ADDITIONAL
REGISTERS
AD0-AD2,
D3-D7
STATUS/
COMMAND
REGISTER
nINTR
nRESET
RESET
LOGIC
MICRO-
SEQUENCER
AND
WORKING
REGISTERS
TX/RX
LOGIC
nPULSE1
nPULSE2
nTXEN
RXIN
OSCILLATOR
nRD/nDS
nWR/DIR
nCS
BUS
ARBITRATION
CIRCUITRY
XTAL1
XTAL2
RECONFIGURATION
TIMER
NODE ID
LOGIC
Figure 1
- Internal Block Diagram
Rev. 09-25-07
Page 4
SMSC COM20019I
PRODUCT PREVIEW
Package Outlines
28-Pin PLCC Package Outline and Parameters
G
E
PIN N O.
1
J
F
A
B
B1
D3
D2
R
J
D1
D
J
A1
C
D IM
A
A1
B
B1
C
D
D1
D2
D3
E
F
G
J
R
N OTES:
28L
.160-.180
.090-.120
.013-.021
.026-.032
.020-.045
.485-.495
.450-.456
.390-.430
.300 R EF
.050 BSC
.042-.056
.042-.048
.000-.020
.025-.045
1. A ll dim ensions are in inches.
2. C ircle indicating pin 1 can appear on a top surface as show n on the draw ing or
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