CY28RS480
AC Electrical Specifications
Parameter
Description
Condition
Min.
Max.
Unit
Crystal
TDC
XIN Duty Cycle
XIN Period
Thedevice willoperatereliably withinput
dutycyclesupto30/70buttheREFclock
duty cycle will not be within specification
47.5
52.5
%
TPERIOD
When XIN is driven from an external
clock source
69.841
71.0
ns
TR / TF
TCCJ
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
Over 150 ms
–
–
–
10.0
500
300
ns
ps
LACC
ppm
CPU Outputs
TR/TF
Output Slew Rate
Measured @ test load using VOCM
400 mV, 0.85 to 1.65
2
7
V/ns
VDIFF
TSKEW
_ VDIFF
VCM
Differential Voltage
Measured at load single ended
Measured at crossing point VOX
Measured at load single ended
Measured at load single ended
Measured at load single ended
Measured at VOX
0.4
–
2.3
250
150
1.45
200
55
V
ps
mV
V
Any CPU to CPU Clock Skew
Change in VDIFF_DC Magnitude
Common Mode Voltage
Change in VCM
–150
1.05
–200
45
_ VCM
TDC
mV
%
Duty Cycle
TJCYC
Cycle to Cycle Jitter
Measured at VOX
0
200
ps
SRC
TDC
SRCT and SRCC Duty Cycle
Measured at crossing point VOX
Measured at crossing point VOX
45
55
%
TPERIOD
100-MHz SRCT and SRCC Period
9.997001 10.00300 ns
9.997001 10.05327 ns
10.12800 9.872001 ns
TPERIODSS
TPERIODAbs
100-MHz SRCT and SRCC Period, SSC Measured at crossing point VOX
100-MHz SRCT and SRCC Absolute
Period
Measured at crossing point VOX
TPERIODSSAbs 100-MHz SRCT and SRCC Absolute
Period, SSC
Measured at crossing point VOX
9.872001 10.17827 ns
TSKEW
TSKEW
Any SRCT/C to SRCT/C Clock Skew
Measured at crossing point VOX
Measured at crossing point VOX
–
–
250
250
ps
ps
Any SRCS clock to Any SRCS clock
Skew
TCCJ
SRCT/C Cycle to Cycle Jitter
SRCT/C Long Term Accuracy
Measured at crossing point VOX
Measured at crossing point VOX
–
–
125
300
700
ps
ppm
ps
LACC
TR / TF
SRCT and SRCC Rise and Fall Times Measured from VOL = 0.175 to
OH = 0.525V
175
V
TRFM
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/(TR + TF)
–
20
%
'TR
Rise TimeVariation
–
–
125
ps
ps
mv
mv
mV
V
'TF
Fall Time Variation
125
VHIGH
VLOW
VOX
Voltage High
Math averages Figure 5
Math averages Figure 5
660
–150
250
–
850
Voltage Low
–
Crossing Point Voltage at 0.7V Swing
Maximum Overshoot Voltage
Minimum Undershoot Voltage
Ring Back Voltage
550
VOVS
VUDS
VRB
VHIGH + 0.3
–0.3
–
–
V
See Figure 5. Measure SE
0.2
V
HTT66 HyperTransport Output
F66 Operating Frequency
–
66.67
MHz
Rev 1.0,November 22, 2006
Page 10 of 14
SPECTRALINEAR [ SPECTRALINEAR INC ]
