COM20020ILJP datasheet(10/72 Pages) MICROCHIP

Part #	COM20020ILJP

Description	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

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Manufacturer	MICROCHIP [Microchip Technology]

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5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

Datasheet

Revision 12-05-06

Page 10

SMSC COM20020I Rev D

DATASHEET

PLCC PIN

NO.

NAME

SYMBOL

DESCRIPTION

21

nTransmit

nEnable

nTXEN

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)

16,17

Crystal

Oscillator

XTAL1,

XTAL2

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 390

Ω pull-up resistor, and XTAL2 should be

left floating.

15,28

Power

Supply

VDD

+5 Volt Power Supply pin.

7,14,22

Ground

VSS

Ground pin.

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