ICS1892 Datasheet, PDF (124/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver

ICS1892 Data Sheet
Chapter 10 DC and AC Operating Conditions
10.5 Timing Diagrams
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 10-1
shows the timing diagram for the time periods.
Note: The REF_IN switching point is 50% of V_DD.
Table 10-8. REF_IN Timing
Time
Period
Parameter
Conditions
Min. Typ. Max. Units
t1 REF_IN Duty Cycle
–
45
50
55
%
t2 REF_IN Period
–
–
40
–
ns
Figure 10-1. REF_IN Timing Diagram
t1
REF_IN
t2
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
124
February 26, 2001