COM20019 datasheet(70/81 Pages) SMSC

Part #	COM20019

Description	Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM

PDF	81 Pages

Scroll/Zoom	100%

Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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70 / 81 page

FIGURE 18 – BACKPLANE MODE TRANSMIT OR RECEIVE TIMING

(These signals are to and from the differential driver or the cable)

DISCONTINUED 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*: t4 and t5 are applied to crystal oscillaton.

4.0V

1.0V

50% of VDD

FIGURE 19 – TTL INPUT TIMING ON XTAL1 PIN

FIGURE 20 – RESET AND INTERRUPT TIMING

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 312.5 Kbps, TDR = 3200 nS)

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

oscillation after VDD was over 4.5V.

COM20019 Datasheet(PDF) 70 Page - SMSC Corporation

COM20019 Datasheet(HTML) 70 Page - SMSC Corporation

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