
IDT / ICS HCSL CLOCK GENERATOR
7
ICS841602AGI REV. A JULY 10, 2008
ICS841602I
FEMTOCLOCKS CRYSTAL-TO-HCSL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION, CONTINUED
DIFFERENTIAL MESUREMENT POINTS FOR DUTY CYCLE PERIOD
SINGLE-ENDED MEASUREMENT POINTS FOR
ABSOLUTE CROSS POINT/SWING
SINGLE-ENDED MEASUREMENT POINTS FOR DELTA CROSS POINT
nQ
Q
VCROSS_MAX = 550mV
VCROSS_MIN = 250mV
VMAX = 1.15V
VMIN = -0.30V
Q
nQ
VCROSS_DELTA = 140mV
Clock Period (Differential)
Positive Duty
Cycle (Differential)
Negative Duty
Cycle (Differential)
Q - nQ
0.0V
COMPOSITE PCIe TRANSFER FUNCTION
20
-20
-40
-60
-80
-100
0
104
105
106
107
108
-3dB
1.2MHz
-3dB
21.9MHz
Frequency (Hz)
Ma
g
(dB)
H3(s) * (H1(s) – H2(s))