COM20022I-HT SMSC, COM20022I-HT Datasheet - Page 9

• Manufacturer Part Number: COM20022I-HT
• Description: IC CTRLR ARCNET 2KX8 RAM 48-TQFP
• Manufacturer: SMSC
• Series: ARCNETr

Specifications of COM20022I-HT

• Controller Type: ARCNET Controller
• Interface: Differential
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 65mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1003

10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
Datasheet
SMSC COM20022I
PIN NO
18,23,
32,43
30,41
19,27
8,20,
6,11,
24
25
28
29
21
22
nPulse 1
nPulse 2
Receive In
nTransmit
Enable
Crystal
Oscillator
Power
Supply
Ground
N/C
NAME
nPULSE1
nPULSE2
RXIN
nTXEN
XTAL1
XTAL2
VDD
VSS
N/C
SYMBOL
TRANSMISSION MEDIA INTERFACE
DATASHEET
OUT
I/O
IN
OUT
IN
OUT
PWR
PWR
I/O
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 09-27-07