SMSC COM20020 manual TTL Input Timing on XTAL1 PIN

	t1	t2	t3
XTAL1
	Parameter		min	typ	max	units
t1	Input Clock High Time		20			nS
						nS
t2	Input Clock Low Time		20
t3	Input Clock Period		50		100	nS
t4	Input Clock Frequency		10		20	MHz
	FIGURE 16 - TTL INPUT TIMING ON XTAL1 PIN
	t1

nRESET IN

nINTR

t2

	Parameter	min	typ	max	units
t1	nRESET IN Pulse Width	3.2			µS
t2	nINTR High to Next nINTR Low	200			nS

FIGURE 17 - RESET AND INTERRUPT TIMING

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