COM20020-5 Datasheet, PDF (54/58 Pages) SMSC Corporation – Universal Local Area Network Controller with 2K x 8 On-Board RAM

t1
t2
XTAL1
Parameter
t1
Input Clock High Time
t2
Input Clock Low Time
t3
Input Clock Period
t4
Input Clock Frequency
t3
min
typ max units
10
nS
10
nS
25
100 ^nS
10
40 MHz
FIGURE 16 – TTL INPUT TIMING ON XTAL1 PIN
t1
nRESET IN
nINTR
t2
Parameter
t1
nRESET IN Pulse Width
t2
nINTR High to Next nINTR Low
min typ max units
1.6
µS
200
nS
FIGURE 17 - RESET AND INTERRUPT TIMING
54