COM20020I-HD Standard Microsystems (SMSC), COM20020I-HD Datasheet - Page 10

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

Specifications of COM20020I-HD

• 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: Not Compliant

Revision 12-05-06
21
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15,28
7,14,22
PLCC PIN
NO.
Ground
nTransmit
nEnable
Crystal
Oscillator
Power
Supply
NAME
nTXEN
XTAL1,
XTAL2
V
V
DD
SS
SYMBOL
DATASHEET
Page 10
Output. This signal is used prior to the Power-up to enable
the line drivers for transmission. The polarity of the signal
is programmable through the nPULSE2 pin.
nPULSE2 floating before Power-up: nTXEN active low
(Default option)
nPULSE2 grounded before Power-up: nTXEN active high
(This option is only available in Backplane Mode)
An external crystal should be connected to these pins.
Oscillation frequency range is from 10 to 20 MHz. If an
external TTL clock is used instead, it must be connected to
XTAL1 with a 390Ω pull-up resistor, and XTAL2 should be
left floating.
+5 Volt Power Supply pin.
Ground pin.
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
DESCRIPTION
SMSC COM20020I Rev D
Datasheet