COM20020ILJP datasheet(65/72 Pages) MICROCHIP

Part #	COM20020ILJP

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

PDF	72 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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65 / 72 page

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

Datasheet

SMSC COM20020I Rev D

Page 65

Revision 12-05-06

DATASHEET

Parameter

Input Clock High Time

Input Clock Period

min

max

units

XTAL1

Input Clock Frequency

100

Input Clock Low Time

typ

MHz

Frequency Accuracy*

-200

200

ppm

Note*: Input clock frequency must be 20 MHz ( 100ppm or better) to use the internal Clock Multiplier.

t5 is applied to crystal oscillaton.

4.0V

1.0V

50% of VDD

Figure 8.13 - TTL Input Timing on XTAL1 Pin

Parameter

nRESET Pulse Width***

min

max

units

nRESET

nINTR High to Next nINTR Low

typ

nINTR

5TXTL*

EF = 0

EF = 1

TDR**/2

4TXTL*

Note*: TXTL is period of external XTAL oscillation frequency.

Note**: TDR is period of Data Rate (i.e. at 2.5 Mbps, TDR = 400 nS)

Note***: When the power is turned on, t1 is measured from stable XTAL

oscillation after VDD was over 4.5V.

Figure 8.14 - Reset and Interrupt Timing

COM20020ILJP Datasheet(PDF) 65 Page - Microchip Technology

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