ICS841654I Datasheet, PDF (8/17 Pages) Integrated Device Technology – FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR

ICS841654I
FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION, CONTINUED
20%
REF_OUT
80%
t_R
LVCMOS OUTPUT RISE/FALL TIME
80%
t_F
20%
REF_OUT
t _PW
V
DDO
2
t
PERIOD
odc = ^{t PW} x 100%
t _PERIOD
LVCMOS OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
nQAx,
nQBx
0.175V
QAx, QBx
0.525V
t_R
0.525V
t_F
V_{SW I N G}
0.175V
0.0V
Q - nQ
Clock Period (Differential)
Positive Duty
Cycle (Differential)
Negative Duty
Cycle (Differential)
DIFFERENTIAL MEASUREMENT POINTS FOR RISE/FALL TIME
nQ
VCROSS_DELTA = 140mV
Q
SE MEASUREMENT POINTS FOR DELTA CROSS POINT
IDT^™ / ICS^™ HCSL CLOCK GENERATOR
DIFFERENTIAL MEASUREMENT POINTS FOR DUTY CYCLE/PERIOD
+150mV
VRB = +100mV
0.0V
VRB = -100mV
-150mV
Q - nQ
TSTABLE
VRB
VRB
TSTABLE
DIFFERENTIAL MEASUREMENT POINTS FOR RINGBACK
8
ICS841654AGI REV. A APRIL 17, 2008