mcf51ac256 Freescale Semiconductor, Inc, mcf51ac256 Datasheet - Page 27

• Manufacturer Part Number: mcf51ac256
• Description: Mcf51ac256 Coldfire Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

2.10
Freescale Semiconductor
Num C
10
11
12
13
14
17
18
1
2
3
4
5
6
7
8
9
—
P
P
P
D Internal reference startup time
D DCO output frequency range - trimmed
D
D
D
D
D FLL acquisition time
D PLL acquisition time
D
D VCO operating frequency
D
D Lock entry frequency tolerance
Internal reference frequency - factory
trimmed at V
= 25
Average internal reference frequency –
untrimmed
Average internal reference frequency –
user trimmed
DCO output frequency range -
untrimmed
value provided for reference: f
1024 X f
Resolution of trimmed DCO output
frequency at fixed voltage and
temperature (using FTRIM)
Resolution of trimmed DCO output
frequency at fixed voltage and
temperature (not using FTRIM)
Total deviation of trimmed DCO output
frequency over voltage and
temperature
Total deviation of trimmed DCO output
frequency over fixed voltage and
temperature range of 0 – 70
Long term Jitter of DCO output clock
(averaged over 2ms interval)
Jitter of PLL output clock measured
over 625 ns
MCG Specifications
Table 16. MCG Frequency Specifications (Temperature Range = –40 to 125°C Ambient)
°C
int_ut
1
1
5
DD
= 5 V and temperature
Rating
2
3
MCF51AC256 ColdFire Microcontroller Data Sheet, Rev.1
Preliminary—Subject to Change Without Notice
°C
C
4
dco_ut
1
EXTAL
6
=
Crystal or Resonator
f
pll_jitter_625ns
Δf
Δf
t
t
Symbol
pll_acquire
fll_acquire
Δf
Δf
f
dco_res_t
dco_res_t
C
f
f
dco_ut
D
f
t
f
MCU
int_ut
dco_t
f
int_ft
irefst
int_t
dco_t
dco_t
Jitter
vco
lock
R
F
31.25
±1.49
XTAL
25.6
Min
7.0
25
32
—
—
—
—
—
—
—
—
—
—
R
S
C
2
Preliminary Electrical Characteristics
Typical
0.566
31.25
33.48
32.7
±0.1
±0.2
–1.0
±0.5
0.02
0.5
60
—
—
—
—
—
—
5
39.0625
41.66
42.66
±2.98
Max
±0.2
±0.4
55.0
100
0.2
40
±2
±1
—
—
1
1
%f
%f
%f
%f
%f
MHz
MHz
MHz
Unit
%f
kHz
kHz
kHz
ms
ms
μs
%
dco
dco
dco
dco
dco
pll
27