Datasheet

MC9S08QE32 Series MCU Data Sheet, Rev. 7
Electrical Characteristics
Freescale Semiconductor14
Figure 6. Pullup and Pulldown Typical Resistor Values (V
DD
= 3.0 V)
16 D POR re-arm time t
POR
10 — — s
17 P
Low-voltage detection threshold —
high range
V
LVD H
V
DD
falling
V
DD
rising
2.11
2.16
2.16
2.21
2.22
2.27
V
18 P
Low-voltage detection threshold —
low range
V
LVDL
V
DD
falling
V
DD
rising
1.80
1.88
1.82
1.90
1.91
1.99
V
19 P
Low-voltage warning threshold —
high range
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
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
V
hys
—80—mV
22 P Bandgap Voltage Reference
7
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, except for PTA5 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
Factory trimmed at V
DD
= 3.0 V, Temp = 25 C
Table 7. DC Characteristics (continued)
Num C Characteristic Symbol Condition Min Typical
1
Max Unit
PULLUP RESISTOR TYPICALS
V
DD
(V)
PULL-UP RESISTOR (k)
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
PULLDOWN RESISTOR TYPICALS
V
DD
(V)
PULLDOWN RESISTANCE (k

)
20
25
30
35
40
1.8 2.3 2.8 3.3
25C
85  C
–40C
3.6