Motorola ColdFire MCF5281 - Manual (Page 691)

Electrical Characteristics
Freescale Semiconductor 33-7
33.5 Phase Lock Loop Electrical Specifications
Table 33-8. PLL Electrical Specifications
(V
DD
and V
DDPLL
= 2.7 to 3.6 V, V
SS
= V
SSPLL
= 0 V)
Characteristic Symbol Min
Max
Unit
66MHz 80MHz
PLL Reference Frequency Range
Crystal reference
External reference
1:1 Mode f
ref_crystal
f
ref_ext
f
ref_1:1
2
2
33.33
8.33
8.33
66.66
10.0
10.0
80
MHz
System Frequency
1
External Clock Mode
On-Chip PLL Frequency
1
All internal registers retain data at 0 Hz.
f
sys
0
f
ref
/ 32
f
sys(max)
66.66
66.66
f
sys(max)
80
80
MHz
Loss of Reference Frequency
2, 4
2
“Loss of Reference Frequency” is the reference frequency detected internally, which transitions the PLL into self
clocked mode.
f
LOR
100 1000 kHz
Self Clocked Mode Frequency
3, 4
3
Self clocked mode frequency is the frequency that the PLL operates at when the reference frequency falls below
f
LOR
with default MFD/RFD settings.
f
SCM
1 5 MHz
Crystal Start-up Time
4, 5
4
This parameter is characterized before qualification rather than 100% tested.
5 Proper PC board layout procedures must be followed to achieve specifications.
t
cst
— 10 ms
EXTAL Input High Voltage
Crystal Mode
All other modes (1:1, Bypass, External)
V
IHEXT
V
XTAL
+ 0.4
2.0
V
DD
V
DD
V
EXTAL Input Low Voltage
Crystal Mode
All other modes (1:1, Bypass, External)
V
ILEXT
V
SS
V
SS
V
XTAL
- 0.4
0.8
V
XTAL Output High Voltage
I
OH
= 1.0 mA
V
OL
V
DD
- 1.0 —
V
XTAL Output Low Voltage
I
OL
= 1.0 mA
V
OL
— 0.5
V
XTAL Load Capacitance 6 — — pF
PLL Lock Time 4,7 t
lpll
— 500
μ
s
Power-up To Lock Time 4, 5,8
With Crystal Reference
Without Crystal Reference
t
lplk
—
— 10.5
500
ms
μ
s
1:1 Clock Skew (between CLKOUT and EXTAL) 9 t
skew
-2 2 ns
Duty Cycle of reference 4 t
dc
40 60 % f
sys
Frequency un-LOCK Range f
UL
- 1.5 1.5 % f
sys
Frequency LOCK Range fLCK - 0.75 0.75 % % f
sys
CLKOUT Period Jitter 4, 5, 7, 10,11 , Measured at f
SYS
Max
Peak-to-peak (Clock edge to clock edge) — MCF521x
Peak-to-peak (Clock edge to clock edge) — MCF528x
Long Term Jitter (Averaged over 2 ms interval)
C
jitter
—
—
— 5
10
.01
% f
sys
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3