mcf51cn128 Freescale Semiconductor, Inc, mcf51cn128 Datasheet - Page 16

• Manufacturer Part Number: mcf51cn128
• Description: Mcf51cn128 Coldfire Microcontroller Cover Mcf51cn128
• Manufacturer: Freescale Semiconductor, Inc

1
2
3
4
5
6
7
8
9
10
Num C
Electrical Characteristics
16
17
18
19
20
Typical values are measured at 25 °C. Characterized, not tested
As an exception, the Fast Ethernet Controller (FEC) is only operational above the operating voltage of 3 V.
As the supply voltage rises, the LVD circuit will hold the MCU in reset until the supply has risen above V
All functional non-supply pins are internally clamped to V
Input must be current limited to the value specified. To determine the value of the required current-limiting resistor, calculate
resistance values for positive and negative clamp voltages, then use the larger of the two values.
Power supply must maintain regulation within operating V
conditions. If positive injection current (V
in external power supply going out of regulation. Ensure external V
current. This will be the greatest risk when the MCU is not consuming power. Examples are: if no system clock is present, or if
clock rate is very low (which would reduce overall power consumption).
Maximum is highest voltage that POR is guaranteed.
Low voltage detection and warning limits measured at 1 MHz bus frequency.
Run at 1 MHz bus frequency
Factory trimmed at V
40
35
30
25
20
1.8
P
P
P
P Bandgap Voltage Reference
Low-voltage detection threshold —
low range
Low-voltage warning threshold —
high range
Low-voltage warning threshold —
low range
2
2.2
PULL-UP RESISTOR TYPICALS
8
8
2.4
8
DD
Characteristic
2.6
= 3.3 V, Temp = 25 °C
V
DD
2.8
(V)
Figure 5. Pull-up and Pull-down Typical Resistor Values
MCF51CN128 ColdFire Microcontroller Data Sheet, Rev. 4
3
10
Table 8. DC Characteristics (continued)
3.2
In
> V
3.4
–40°C
DD
85°C
25°C
) is greater than I
3.6
Symbol
V
V
V
V
LVWH
LVWL
LVDL
BG
SS
DD
and V
range during instantaneous and operating maximum current
DD
DD
40
35
30
25
20
DD
1.8
V
V
V
, the injection current may flow out of V
Condition
V
V
V
.
DD
DD
DD
DD
DD
DD
load will shunt current greater than maximum injection
—
falling
falling
falling
rising
rising
rising
2.3
PULL-DOWN RESISTOR TYPICALS
1.70
1.80
2.50
2.50
2.25
2.29
1.15
Min
V
DD
(V)
2.8
Typ
1.83
1.89
2.62
2.62
2.32
2.39
1.17
Freescale Semiconductor
1
LVDL
DD
3.3
.
and could result
–40°C
Max
1.95
2.00
2.70
2.70
2.45
2.49
1.18
85°C
25°C
3.6
Unit
V
V
V
V