
3-16
DC and Switching Characteristics
Lattice Semiconductor
MachXO Family Data Sheet
sysCLOCK PLL Timing
Over Recommended Operating Conditions
MachXO “C” Sleep Mode Timing
Parameter
Descriptions
Conditions
Min.
Max.
Units
fIN
Input Clock Frequency (CLKI, CLKFB)
25
420
MHz
Input Divider (M) = 1;
Feedback Divider (N) <= 4
5, 6
18
25
MHz
fOUT
Output Clock Frequency (CLKOP, CLKOS)
25
420
MHz
fOUT2
K-Divider Output Frequency (CLKOK)
0.195
210
MHz
fVCO
PLL VCO Frequency
420
840
MHz
fPFD
Phase Detector Input Frequency
25
—
MHz
Input Divider (M) = 1;
Feedback Divider (N) <= 4
5, 6
18
25
MHz
AC Characteristics
tDT
Output Clock Duty Cycle
Default duty cycle selected
3
45
55
%
tPH
4
Output Phase Accuracy
—
0.05
UI
tOPJIT
1
Output Clock Period Jitter
fOUT >= 100 MHz
—
+/-120
ps
fOUT < 100 MHz
—
0.02
UIPP
tSK
Input Clock to Output Clock Skew
Divider ratio = integer
—
+/-200
ps
tW
Output Clock Pulse Width
At 90% or 10%
3
1—
ns
tLOCK
2
PLL Lock-in Time
—
150
s
tPA
Programmable Delay Unit
100
450
ps
tIPJIT
Input Clock Period Jitter
fOUT 100 MHz
—
+/-200
ps
fOUT < 100 MHz
—
0.02
UI
tFBKDLY
External Feedback Delay
—
10
ns
tHI
Input Clock High Time
90% to 90%
0.5
—
ns
tLO
Input Clock Low Time
10% to 10%
0.5
—
ns
tRST
RST Pulse Width
10
—
ns
1. Jitter sample is taken over 10,000 samples of the primary PLL output with a clean reference clock.
2. Output clock is valid after tLOCK for PLL reset and dynamic delay adjustment.
3. Using LVDS output buffers.
4. CLKOS as compared to CLKOP output.
5. When using an input frequency less than 25 MHz the output frequency must be less than or equal to 4 times the input frequency.
6. The on-chip oscillator can be used to provide reference clock input to the PLL provided the output frequency restriction for clock
inputs below 25 MHz are followed.
Rev. A 0.19
Symbol
Parameter
Device
Min.
Typ.
Max
Units
tPWRDN
SLEEPN Low to Power Down
All
—
400
ns
tPWRUP
SLEEPN High to Power Up
LCMXO256
—
400
s
LCMXO640
—
600
s
LCMXO1200
—
800
s
LCMXO2280
—
1000
s
tWSLEEPN
SLEEPN Pulse Width
All
400
—
ns
tWAWAKE
SLEEPN Pulse Rejection
All
—
100
ns
Rev. A 0.19