CY28405
AC Electrical Specifications
Parameter
Crystal
Description
Conditions
Min.
Max.
Unit
TDC
XIN Duty Cycle
The device will operate
reliably with input duty cycles
up to 30/70 but the REFclock
duty cycle will not be within
specification
47.5
52.5
%
TPERIOD
TR / TF
TCCJ
XIN period
When Xin is driven from an
external clock source
69.841
71.0
10.0
ns
ns
XIN Rise and Fall Times
XIN Cycle to Cycle Jitter
Long-term Accuracy
Measured between 0.3VDD
and 0.7VDD
–
–
As an average over 1 Ps
duration
500
300
ps
LACC
Over 150ms
ppm
CPU at 0.7V
TDC
CPUT and CPUC Duty Cycle
100-MHz CPUT and CPUC Period
133-MHz CPUT and CPUC Period
200-MHz CPUT and CPUC Period
Any CPU to CPU Clock Skew
CPU Cycle to Cycle Jitter
MeasuredatcrossingpointVOX
Measured at crossing point VOX
Measured at crossing point VOX
Measured at crossing point VOX
MeasuredatcrossingpointVOX
Measured at crossing point VOX
45
9.9970
7.4978
4.9985
–
55
%
ns
ns
ns
ps
ps
TPERIOD
TPERIOD
TPERIOD
TSKEW
TCCJ
10.003
7.5023
5.0015
100
–
125
TR / TF
CPUT and CPUC Rise and Fall Times Measured from VOL = 0.175
to VOH = 0.525V
175
–
700
20
ps
%
TRFM
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/ (TR + TF)
'TR
Rise Time Variation
–
–
125
ps
ps
mv
mv
mv
V
'TF
Fall Time Variation
125
VHIGH
VLOW
VOX
Voltage High
Math average, see Figure 7
Math average,see Figure 7
660
–150
250
–
850
Voltage Low
–
550
Crossing Point Voltage at 0.7V Swing
Maximum Overshoot Voltage
Minimum Undershoot Voltage
Ring Back Voltage
VOVS
VUDS
VRB
VHIGH+0.3
–
–0.3
–
V
See Figure 7. Measure SE
0.2
V
3V66
TDC
3V66 Duty Cycle
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 2.4V
Measurement at 0.4V
45
55
15.0045
15.0799
–
%
ns
ns
ns
ns
TPERIOD
TPERIOD
THIGH
Spread Disabled 3V66 Period
Spread Enabled 3V66 Period
3V66 High Time
14.9955
14.9955
4.9500
4.5500
TLOW
3V66 Low Time
–
TR / TF
3V66 Rise and Fall Times
Measured between 0.4V and
2.4V
0.5
2.0
ns
TSKEW
TCCJ
Any 3V66 to Any 3V66 Clock Skew
3V66 Cycle to Cycle Jitter
Measurement at 1.5V
Measurement at 1.5V
–
–
250
250
ps
ps
PCI/PCIF
TDC
PCIF and PCI Duty Cycle
Measurement at 1.5V
Measurement at 1.5V
Measurement at 1.5V
Measurement at 2.4V
45
55
30.0009
30.1598
–
%
ns
ns
ns
TPERIOD
TPERIOD
THIGH
Spread Disabled PCIF/PCI Period
Spread Enabled PCIF/PCI Period
PCIF and PCI High Time
29.9910
29.9910
12.0
Rev 1.0,November 20, 2006
Page 15 of 18
SPECTRALINEAR [ SPECTRALINEAR INC ]
