MEC1404 Datasheet, PDF (498/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
TABLE 42-5: DC ELECTRICAL CHARACTERISTICS (CONTINUED)
Parameter
Symbol MIN
TYP MAX Units Comments
Crystal oscillator
XTAL1 (OCLK)
XTAL2 (ICLK)
The MEC140X/1X crystal oscillator design requires a 32.768 KHz parallel resonant crystal
with load caps in the range 4-18pF. Refer to “Application Note PCB Layout Guide for
MEC140X/1X” for more information.
Low Input Level
High Input Level
V_ILI
0.4
V
V_ILH
2.0
V
VIN = 0 to VTR
ADC, DAC, and Comparator Reference Pins
ADC_VREF
Voltage (Option A)
Voltage (Option B)
Input Impedance
Input Low Current
DAC_VREF
V
V
R_REF
ILEAK
VTR
V
2.97
3.0 3.03
V
75
kΩ
-0.05
+0.05 µA
connect to same power supply as
VTR
This buffer is not 5V tolerant
This buffer is not backdrive protected.
Voltage
Input Impedance
Input Low Current
CMP_VREF
V
0.5
R_REF
100
ILEAK
-10
VTR
V
kΩ
+10
µA
This buffer is not 5V tolerant
This buffer is not backdrive protected.
Voltage
Input Current (com-
parator enabled)
Input Low Current
V
I_DC
ILEAK
0
-
-0.05
VTR
V
30
µA
+0.05 µA
This buffer is not 5V tolerant
This buffer is not backdrive protected.
42.2.4.1 Max Voltage Tolerance
All the functional pins are 3.63V tolerant, except for the 1.8V I/O signals defined in Section 2.6, "1.8V or 3.3V I/O Pins,"
on page 24. The 1.8V I/O signals can only tolerate up to +/-10% I/O operation (or +1.98V max)
42.2.4.2 Pin Leakage
Leakage characteristics for all pins, except for the battery powered pins with the ILLK buffer type, is shown in the fol-
lowing table:
DS00001956D-page 498
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