ICS1893 Datasheet, PDF (127/152 Pages) Integrated Circuit Systems – 3.3-V 10Base-T/100Base-TX Integrated PHYceiver™

ICS1893 - Release
10.5 Timing Diagrams
Chapter 10 DC and AC Operating Conditions
10.5.1 Timing for Clock Reference In (REF_IN) Pin
Table 10-8 lists the significant time periods for signals on the clock reference in (REF_IN) pin. Figure 10-2
shows the timing diagram for the time periods.
Note: The REF_IN switching point is 50% of VDD.
Table 10-8. REF_IN Timing
Time
Period
Parameter
t1 REF_IN Duty Cycle
t2 REF_IN Period
Conditions
–
–
Min. Typ. Max. Units
45
50
55
%
–
40
–
ns
Figure 10-2. REF_IN Timing Diagram
t1
REF_IN
t2
ICS1893 Rev C 6/6/00
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
127
June, 2000