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COM20022I3V-HD

10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM

SMSC -> Microchip 

10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM

Datasheet

XTAL1

XTAL2

AD0-AD7

ALE

A15

RESET

nRD

nWR

nINT1

8051

COM20022

AD0-AD2, D3-D7

A2/BALE

nCS

nRESET

nRD/nDS

nWR/DIR

nINTR

RXIN

nTXEN

nPULSE1

nPULSE2

GND

75176B or

Equiv.

Differential Driver

Configuration

A0/nMUX XTAL1 XTAL2

27 pF

20 MHz

XTAL

27 pF

*Media Interface

may be replaced

with Figure A, B or C.

RXIN

TXEN

nPULSE1

nPULSE2

GND

+5V

100 Ohm

BACKPLANE CONFIGURATION

FIGURE A

3V.

RXIN

+5V

2

6 Receiver

HFD3212-002

7

nPULSE1

+5V

Transmitter

3 HFE4211-014

2

6

7

2 Fiber Interface

(ST Connectors)

NOTE: COM20022 must be in backplane mode

FIGURE B

Figure 5.1 - Multiplexed, 8051 - Like Bus Interface with RS-485 Interface

SMSC COM20022I 3.3V Rev.C

Page 17

DATASHEET

Revision 03-08-07

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