Phase Lock Loop Electrical Specifications; Pll Electrical Specifications - Motorola ColdFire MCF5281 User Manual

Phase Lock Loop Electrical Specifications

33.4 Phase Lock Loop Electrical Specifications
Characteristic
PLL Reference Frequency Range
Crystal reference
External reference
1:1 Mode
1
System Frequency
External Clock Mode
On-Chip PLL Frequency
Loss of Reference Frequency
Self Clocked Mode Frequency
4, 5
Crystal Start-up Time
EXTAL Input High Voltage
Crystal Mode
All other modes (1:1, Bypass, External)
EXTAL Input Low Voltage
Crystal Mode
All other modes (1:1, Bypass, External)
XTAL Output High Voltage
I = 1.0 mA
OH
XTAL Output Low Voltage
I = 1.0 mA
OL
6
XTAL Load Capacitance
4,7
PLL Lock Time
4, 5,8
Power-up To Lock Time
With Crystal Reference
Without Crystal Reference
1:1 Clock Skew (between CLKOUT and EXTAL)
4
Duty Cycle of reference
Frequency un-LOCK Range
Frequency LOCK Range
4, 5, 7, 10,11
CLKOUT Period Jitter
Peak-to-peak Jitter (Clock edge to clock edge)
Long Term Jitter (Averaged over 2 ms interval)
1
All internal registers retain data at 0 Hz.
2
"Loss of Reference Frequency" is the reference frequency detected internally, which transitions the PLL into
self clocked mode.
3
Self clocked mode frequency is the frequency that the PLL operates at when the reference frequency falls
below f with default MFD/RFD settings.
LOR
4
This parameter is characterized before qualification rather than 100% tested.
5
Proper PC board layout procedures must be followed to achieve specifications.
6
Load Capacitance determined from crystal manufacturer specifications and will include circuit board parasitics.
7
This specification applies to the period required for the PLL to relock after changing the MFD frequency control bits
in the synthesizer control register (SYNCR).
33-6
Table 33-4. PLL Electrical Specifications
(V and V = 2.7 to 3.6 V, V
DD DDPLL
2, 4
3, 4
9
, Measured at f Max
SYS
MCF5282 User's Manual
= V = 0 V)
SS SSPLL
Symbol Min
f 2
ref_crystal
f 2
ref_ext
f 33.33
ref_1:1
f
sys
0
f / 32
ref
f 100
LOR
f 1
SCM
t —
cst
V
IHEXT
V - 1.0
DD
2.0
V
ILEXT
V
SS
V
SS
V
OL
V - 1.0
DD
V
OL
—
—
t —
lpll
t
lplk
—
—
t -2
skew
t 40
dc
f - 1.5
UL
fLCK - 0.75
C
jitter
—
—
Max Unit
MHz
10.0
10.0
80
MHz
80
80
1000 kHz
5 MHz
10 ms
V
V
DD
V
DD
V
1.0
0.8
V
—
V
0.5
— pF
µs
500
10.5 ms
µs
500
2 ns
60 % f
sys
1.5 % f
sys
0.75 % % f
sys
10 % f
sys
.01
MOTOROLA