COM20022ITQFP SMSC, COM20022ITQFP Datasheet - Page 14

• Manufacturer Part Number: COM20022ITQFP
• Description: Network Controller & Processor ICs ARCNET Contrllr
• Manufacturer: SMSC

Specifications of COM20022ITQFP

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 10 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current (max): 65 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Acknowledgements
An Acknowledgement is used to acknowledge reception of a packet or as an affirmative response to FREE BUFFER
ENQUIRIES and is sent by the following sequence:
Negative Acknowledgements
A Negative Acknowledgement is used as a negative response to FREE BUFFER ENQUIRIES and is sent by the
following sequence:
SMSC COM20020I 3.3V Rev.E
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
BURST
ALERT
N data bytes where COUNT = 256-N (or 512-N for a long packet)
Two CRC (Cyclic Redundancy Check) characters. The CRC polynomial used is: X
An ALERT BURST
An ACK (ACKnowledgement--ASCII code 86H) character
An ALERT BURST
A NAK (Negative Acknowledgement--ASCII code 15H) character
ALERT BURST
ALERT BURST
SOH
SID
ACK
NAK
DID
DID
COUNT
DATASHEET
Page 14
data
data
CRC
16
+ X
15
CRC
+ X
2
+ 1.
Revision 09-11-06