COM20020I-HT Standard Microsystems (SMSC), COM20020I-HT Datasheet - Page 18

• Manufacturer Part Number: COM20020I-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20020I-HT

• Number Of Transceivers: 1
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Revision 12-05-06
nPULSE
nPULSE
TXEN
RXIN
GND
Figure 5.1 – Multiplexed, 8051-Like Bus Interface with RS-485 Interface
8051
BACKPLANE
AD0-
RESET
XTAL1
XTAL2
nINT1
ALE
A15
FIGURE A
nWR
nRD
DATASHEET
A0/nMU
27 pF
AD0-AD2, D3-
A2/BAL
nRESET
nRD/nD
nWR/DI
nCS
nINTR
+5V
100
Page 18
XTAL1
COM20020ID
20 MHz
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
XTAL
nPULSE
XTAL2
NOTE: COM20020 must be in backplane mode
RXIN
nPULSE
nPULSE
nTXEN
RXIN
GND
27 pF
FIGURE B
Differential
Configuratio
*
Media
with Figure A, B or
may be
+5V
+5V
75176B or
Equiv.
2
6
7
3
2
6
7
2 Fiber
(ST
HFD3212-
HFE4211-
Transmitte
Receive
SMSC COM20020I Rev D
Datasheet