Altera Corporation
4–95
January 2006
Stratix Device Handbook, Volume 1
DC & Switching Characteristics
tSKEW
Clock skew between two external
clock outputs driven by the different
counters with the same settings
±75
ps
fSS
Spread spectrum modulation
frequency
30
150
kHz
% spread
Percentage spread for spread
0.4
0.5
0.6
%
tARESET
Minimum pulse width on areset
signal
10
ns
tARESET_RECON
FIG
Minimum pulse width on the
areset
signal when using PLL
reconfiguration. Reset the PLL after
scandataout
goes high.
500
ns
Table 4–128. Enhanced PLL Specifications for -6 Speed Grades
(Part 1 of 2)
Symbol
Parameter
Min
Typ
Max
Unit
fIN
Input clock frequency
3
650
MHz
fINPFD
Input frequency to PFD
3
420
MHz
fINDUTY
Input clock duty cycle
40
60
%
fEINDUTY
External feedback clock input duty
cycle
40
60
%
tINJITTER
Input clock period jitter
ps
tEINJITTER
External feedback clock period jitter
ps
tFCOMP
External feedback clock compensation
6ns
fOUT
Output frequency for internal global or
regional clock
0.3
450
MHz
fOUT_EXT
Output frequency for external clock
(3)0.3
500
MHz
tOUTDUTY
Duty cycle for external clock output
(when set to 50%)
45
55
%
tJITTER
Period jitter for external clock output
±100 ps for >200-MHz outclk
±20 mUI for <200-MHz outclk
ps or
mUI
tCONFIG5,6
Time required to reconfigure the scan
chains for PLLs 5 and 6
289/fSCANCLK
tCONFIG11,12 Time required to reconfigure the scan
chains for PLLs 11 and 12
193/fSCANCLK
Table 4–127. Enhanced PLL Specifications for -5 Speed Grades (Part 2 of 2)
Symbol
Parameter
Min
Typ
Max
Unit