Datasheet

Electrical Characteristics
MCF5227x ColdFire
®
Microprocessor Data Sheet, Rev. 8
Freescale Semiconductor 19
5.5 Oscillator and PLL Electrical Characteristics
SDRAM and FlexBus Output High Voltage
Mobile DDR/Bus Input High Voltage (nominal 1.8V)
DDR/Bus Pad Supply Voltage (nominal 2.5V)
SDR/Bus Pad Supply Voltage (nominal 3.3V)
I
OH
= –5.0 mA for all modes
SDV
OH
1.4
2.1
2.4
—
—
—
V
SDRAM and FlexBus Output Low Voltage
Mobile DDR/Bus Input High Voltage (nominal 1.8V)
DDR/Bus Pad Supply Voltage (nominal 2.5V)
SDR/Bus Pad Supply Voltage (nominal 3.3V)
I
OL
= 5.0 mA for all modes
SDV
OL
—
—
—
0.3
0.3
0.5
V
Input Leakage Current
V
in
= V
DD
or V
SS
, Input-only pins
I
in
–1.0 1.0 μA
Weak Internal Pull-Up Device Current, tested at V
IL
Max.
1
I
APU
–10 –130 μA
Input Capacitance
2
All input-only pins
All input/output (three-state) pins
C
in
—
—
7
7
pF
1
Refer to the signals section for pins having weak internal pull-up devices.
2
This parameter is characterized before qualification rather than 100% tested.
Table 11. PLL Electrical Characteristics
Num Characteristic Symbol Min Max Unit
1 PLL Reference Frequency Range
Crystal reference
External reference
f
ref_crystal
f
ref_ext
16
16
25
1
66.67
1
MHz
MHz
2 Core/system frequency
CLKOUT Frequency
f
sys
f
sys/2
512 Hz
2
256 Hz
2
166.67
83.33
MHz
MHz
3 Crystal Start-up Time
3,4
t
cst
—10ms
4 EXTAL Input High Voltage
Crystal Mode
5
All other modes (External, Limp)
V
IHEXT
V
IHEXT
V
XTAL
+ 0.4
E
VDD
/2 + 0.4
—
—
V
V
5 EXTAL Input Low Voltage
Crystal Mode
5
All other modes (External, Limp)
V
ILEXT
V
ILEXT
—
—
V
XTAL
– 0.4
E
VDD
/2 – 0.4
V
V
7 PLL Lock Time
3,6
t
lpll
— 50000 CLKIN
8 Duty cycle of reference
3
t
dc
40 60 %
9 XTAL Current I
XTAL
13mA
10 Total on-chip stray capacitance on XTAL C
S_XTAL
—1.5pF
11 Total on-chip stray capacitance on EXTAL C
S_EXTAL
—1.5pF
12 Crystal capacitive load C
L
See crystal spec
Table 10. DC Electrical Specifications (continued)
Characteristic Symbol Min Max Unit