參數(shù)資料
型號(hào): MCF51MM256VLK
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 50.33 MHz, MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, ROHS COMPLIANT, LQFP-80
文件頁數(shù): 31/58頁
文件大?。?/td> 609K
代理商: MCF51MM256VLK
Electrical Characteristics
Freescale Semiconductor
37
3.10
MCG and External Oscillator (XOSC) Characteristics
Table 18. MCG (Temperature Range = –40 to 105°C Ambient)
#
Rating
Symbol
Min
Typical
Max
Unit
C
1
Internal reference startup time
tirefst
—55
100
sD
2
Average internal reference
frequency
factory trimmed at
VDD=3.0 V and
temp=25
C
fint_ft
31.25
kHz
C
user trimmed
31.25
39.0625
C
3
DCO output frequency range —
trimmed
Low range
(DRS=00)
fdco_t
16
20
MHz
C
Mid range
(DRS=01)
32
40
C
High range1
(DRS=10)
1
This should not exceed the maximum CPU frequency for this device which is 50.33 MHz.
40
60
C
4
Resolution of trimmed DCO
output frequency at fixed voltage
and temperature
with FTRIM
f
dco_res_t
0.1
0.2
%fdco
C
without FTRIM
0.2
0.4
C
5
Total deviation of trimmed DCO
output frequency over voltage and
temperature
over voltage and
temperature
f
dco_t
1.0
2
%fdco
P
over fixed voltage
and temp range
of 0 – 70
C
0.5
1C
6
Acquisition time
FLL2
tfll_acquire
——
1
ms
C
PLL3
tpll_acquire
——
1
D
7
Long term Jitter of DCO output clock (averaged over
2mS interval) 4
CJitter
—0.02
0.2
%fdco
C
8
VCO operating frequency
fvco
7.0
55.0
MHz
D
9
PLL reference frequency range
fpll_ref
1.0
2.0
MHz
D
10
Jitter of PLL output clock
measured over 625ns 5
Long term
fpll_jitter_625
ns
0.5664
%fpll
D
11 Lock frequency tolerance
Entry6
Dlock
1.49
2.98
%
D
Exit7
Dunl
4.47
5.97
D
12 Lock time
FLL
tfll_lock
——
tfll_acquire+
1075(1/fint_t)
s
D
PLL
tpll_lock
——
tpll_acquire+
1075(1/fpll_re
f)
D
13
Loss of external clock minimum frequency - RANGE =
0
floc_low
(3/5) x
fint_t
——
kHz
D
14
Loss of external clock minimum frequency - RANGE =
1
floc_high
(16/5) x
fint_t
——
kHz
D
Freescale reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
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