COM20020I3V-HT Standard Microsystems (SMSC), COM20020I3V-HT Datasheet - Page 9

• Manufacturer Part Number: COM20020I3V-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20020I3V-HT

• Number Of Transceivers: 1
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
SMSC COM20020I 3.3V
PIN NO
32, 35,
18, 23,
19, 27,
33, 40,
38, 43
30, 41
14-17,
42, 48
8, 20,
6, 11,
3, 5,
24
25
28
29
21
22
nPulse 1
nPulse 2
Receive In
nTransmit
Enable
Crystal
Oscillator
Power
Supply
Ground
N/C
NAME
N/C
nPULSE1
nPULSE2
RXIN
nTXEN
XTAL1
XTAL2
VDD
VSS
SYMBOL
TRANSMISSION MEDIA INTERFACE
DATASHEET
PWR
PWR
OUT
OUT
OUT
I/O
I/O
IN
IN
Page 9
In Normal Mode, these active low signals carry the
transmit data information, encoded in pulse format as
DIPULSE waveform. In Backplane Mode, the
nPULSE1 signal driver is programmable (push/pull or
open-drain), while the nPULSE2 signal provides a
clock with frequency of doubled data rate. nPULSE1
is connected to a weak internal pull-up resistor on
the open/drain driver in backplane mode.
This signal carries the receive data information from
the line transceiver.
Transmission Enable signal. Active polarity is
programmable through the nPULSE2 pin.
nPULSE2 floating before power-up;
nTXEN active low
nPULSE2 grounded before power-up;
nTXEN active high (this option is only available in
Back Plane mode)
An external crystal should be connected to these
pins. Oscillation frequency range is from 10 MHz to
20 MHz. If an external TTL clock is used instead, it
must be connected to XTAL1 with a 390ohm pull-up
resistor, and XTAL2 should be left floating.
+5 Volt power supply pins.
Ground pins.
Non-connection
DESCRIPTION
Revision 12-06-06