RTL8169
2002/03/27
Rev.1.21
71
PCI Clock Specification
0.6Vcc
0.2Vcc
0.4Vcc, peak-to-peak
(minimum)
0.3Vcc
T_high
T_low
T_cyc
0.5Vcc
0.4Vcc
3.3V Clock Waveform
CLK (@ Device #1)
CLK (@ Device #2)
T_skew
T_skew
T_skew
V_ih
V_ih
V_il
V_il
V_test
V_test
Clock Skew Diagram
66MHz
33MHz
Symbol
Parameter
Min
Max
Min
Max
Units
Tcyc
CLK
Cycle Time
15 30 30
∞
ns
Thigh
CLK
High Time
6 11
ns
Tlow
CLK
Low Time
6 11
ns
--
CLK
Slew Rate
1.5 4 1 4
V/ns
--
RST#
Slew Rate
50 - 50 -
mV/ns
Tskew
CLK
Skew
1 2
ns
Clock and Reset Specifications