Datasheet

MC9S08QE128 Series Data Sheet, Rev. 7
Electrical Characteristics
Freescale Semiconductor16
Figure 7. Pull-up and Pull-down Typical Resistor Values
18 P
Low-voltage detection threshold —
low range
7
V
LVDL
V
DD
falling
V
DD
rising
1.80
1.86
1.82
1.90
1.91
1.99
V
19 P
Low-voltage warning threshold —
high range
7
V
LVWH
V
DD
falling
V
DD
rising
2.36
2.36
2.46
2.46
2.56
2.56
V
20 P
Low-voltage warning threshold —
low range
7
V
LVWL
V
DD
falling
V
DD
rising
2.11
2.16
2.16
2.21
2.22
2.27
V
21 C
Low-voltage inhibit reset/recover
hysteresis
7
V
hys
—50—mV
22 P Bandgap Voltage Reference
9
V
BG
1.15 1.17 1.18 V
1
Typical values are measured at 25°C. Characterized, not tested
2
As the supply voltage rises, the LVD circuit will hold the MCU in reset until the supply has risen above V
LVDL
.
3
All functional non-supply pins are internally clamped to V
SS
and V
DD
.
4
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.
5
Power supply must maintain regulation within operating V
DD
range during instantaneous and operating maximum current
conditions. If positive injection current (V
In
> V
DD
) is greater than I
DD
, the injection current may flow out of V
DD
and could result
in external power supply going out of regulation. Ensure external V
DD
load will shunt current greater than maximum injection
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).
6
Maximum is highest voltage that POR is guaranteed.
7
Low voltage detection and warning limits measured at 1 MHz bus frequency.
8
Run at 1 MHz bus frequency
9
Factory trimmed at V
DD
= 3.0 V, Temp = 25°C
Table 8. DC Characteristics (continued)
Num C Characteristic Symbol Condition Min Typ
1
Max Unit
PULL-UP RESISTOR TYPICALS
V
DD
(V)
PULL-UP RESISTOR (kΩ)
20
25
30
35
40
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
25°C
85 ° C
–40°C
PULL-DOWN RESISTOR TYPICALS
V
DD
(V)
PULL-DOWN RESISTANCE (k
Ω
)
20
25
30
35
40
1.8 2.3 2.8 3.3
25°C
85 ° C
–40°C
3.6