COM20019I-HD View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'COM20019I-HD' PDF : 65 Pages View PDF
Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM
XTAL1
XTAL2
AD0-AD7
ALE
A15
RESET
nRD
nWR
nINT1
8051
COM20019I
AD0-AD2, D3-D7
A2/BALE
nCS
nRESET
nRD/nDS
nWR/DIR
nINTR
RXIN
nTXEN
nPULSE1
nPULSE2
GND
75176B or
Equiv.
Differential Driver
Configuration
A0/nMUX XTAL1 XTAL2
27 pF
20 MHz
XTAL
27 pF
*Media Interface
may be replaced
with Figure A or B.
RXIN
TXEN
nPULSE1
nPULSE2
GND
+5V
100 Ohm
BACKPLANE CONFIGURATION
FIGURE A
RXIN
+5V
2
6 Receiver
HFD3212-002
7
nPULSE1
+5V
Transmitter
3 HFE4211-014
2
6
7
2 Fiber Interface
(ST Connectors)
NOTE: COM20019 must be in backplane mode
FIGURE B
Figure 5.1 - MULTIPLEXED, 8051-LIKE BUS INTERFACE WITH RS-485 INTERFACE
Rev. 04-15-05
Page 16
DATASHEET
SMSC COM20019I
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