3.3-V DC Electrical Characteristics
MC68HC908QC16 MC68HC908QC8 MC68HC908QC4 Data Sheet, Rev. 5
Freescale Semiconductor
241
Input hysteresis
VHYS
0.06 x VDD
——
V
DC injection current(3) (4) (5) (6)
Single pin limit
Vin > VDD
Vin < VSS
Total MCU limit, includes sum of all stressed pins
Vin > VDD
Vin < VSS
IIC
0
—
2
–0.2
25
–5
mA
Ports Hi-Z leakage current
IIL
0—
±1
A
Capacitance
CIN
——
8
pF
POR rearm voltage
VPOR
750
—
mV
POR rise time ramp rate(3)(7)
RPOR
0.035
—
V/ms
Monitor mode entry voltage (3)
VTST
VDD + 2.5
—
VDD + 4.0
V
Pullup resistors(8)
PTA0–PTA5, PTB0–PTB7, PTC3–PTC0, PTD7–PTD0
RPU
16
26
36
k
Pulldown resistors(6)
PTA0–PTA5
RPD
16
26
36
k
Low-voltage inhibit reset, trip falling voltage(9)
VTRIPF
2.65
2.85
3.0
V
Low-voltage inhibit reset, trip rising voltage
VTRIPR
2.73
2.93
3.08
V
Low-voltage inhibit reset/recover hysteresis
VHYS
—80
—
mV
1. VDD = 3.0 to 3.6 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
2. Typical values reflect average measurements at midpoint of voltage range, 25 C only.
3. Values are based on characterization results, not tested in production.
4. All functional non-supply pins are internally clamped to VSS and VDD.
5. 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.
6. Power supply must maintain regulation within operating VDD range during instantaneous and operating maximum current
conditions. If positive injection current (Vin > VDD) is greater than IDD, the injection current may flow out of VDD and could
result in external power supply going out of regulation. Ensure external VDD 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).
7. If minimum VDD is not reached before the internal POR reset is released, the LVI will hold the part in reset until minimum
VDD is reached.
8. RPU and RPD measured at VDD = 3.3 V. Pulldown resistors only available when KBIx is enabled with KBIxPOL =1.
9. Functionality of MCU guaranteed by production test down to minimum LVI trip point. The electrical parameters are only
guaranteed within the specified operating voltage range.
Characteristic(1)
Symbol
Min
Typ(2)
Max
Unit