MC68HC908QL4 Datasheet, PDF (208/226 Pages) Motorola, Inc – Microcontrollers

Electrical Specifications
Characteristic⁽¹⁾
Input hysteresis⁽³⁾
DC injection current^{(3) (4) (5) (6)}
Single pin limit
V_in > V_DD
V_in < V_SS
Total MCU limit, includes sum of all stressed pins
V_in > V_DD
V_in < V_SS
Symbol
V_HYS
Min
0.06 x V_DD
Typ⁽²⁾
—
Max
—
Unit
V
0
—
2
I_IC
0
—
–0.2
mA
0
—
25
0
—
–5
Ports Hi-Z leakage current
Capacitance
Ports (as input)⁽³⁾
I_IL
0
—
±1
μA
C_IN
—
—
8
pF
POR rearm voltage
POR rise time ramp rate⁽³⁾⁽⁷⁾
Monitor mode entry voltage ⁽³⁾
Pullup resistors⁽⁸⁾
PTA0–PTA5, PTB0–PTB7
Pulldown resistors⁽⁹⁾
PTA0–PTA5
V_POR
R_POR
V_TST
R_PU
R_PD
0.75
0.035
V_DD + 2.5
16
16
—
—
V
—
—
V/ms
—
V_DD + 4.0
V
26
36
kΩ
26
36
kΩ
Low-voltage inhibit reset, trip falling voltage
Low-voltage inhibit reset, trip rising voltage
Low-voltage inhibit reset/recover hysteresis
V_TRIPF
2.65
2.8
3.0
V
V_TRIPR
2.75
2.9
3.10
V
V_HYS
—
100
—
mV
1. V_DD = 3.0 to 3.6 Vdc, V_SS = 0 Vdc, T_A = T_L to T_H, unless otherwise noted.
2. Typical values reflect average measurements at midpoint of voltage range, 25°C only.
3. This parameter is characterized and not tested on each device.
4. All functional non-supply pins are internally clamped to V_SS and V_DD.
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 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).
7. If minimum V_DD is not reached before the internal POR reset is released, the LVI will hold the part in reset until minimum
V_DD is reached.
8. R_PU is measured at V_DD = 3.3 V. Pullup resistors only available when PTAPUEx is enabled with KBIPx = 0.
9. R_PD is measured at V_DD = 3.3 V, Pulldown resistors only available when PTAPUEx is enabled with KBIPx =1.
MC68HC908QL4 Data Sheet, Rev. 7
208
Freescale Semiconductor