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written agreement.
WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
3.3
Electrical Information for Digital I/O
The three types of digital I/O on the Q2686 Wireless CPU
®
are: 2.8 volt CMOS,
1.8 volt CMOS and Open drain.
The three types are described below:
Electrical characteristics of digital I/O
2.8 volt type (2V8 )
Parameter
I/O type
Minim.
Typ
Maxim.
Condition
Internal 2.8V power supply VCC_2V8
2.74V 2.8V
2.86V
V
IL
CMOS
-0.5V* 0.84V
V
IH
CMOS
1.96V 3.2V*
V
OL
CMOS
0.4V
I
OL
= - 4 mA
V
OH
CMOS
2.4V I
OH
= 4 mA
I
OH
4mA
Input / Output pin
I
OL
-
4mA
*Absolute maximum ratings
All 2.8V I/O pins do not accept input signal voltage above the maximum
voltage specified above, except for the UART1 interface, which is 3.3V tolerant.
1.8 volt type (1V8)
Parameter
I/O type
Minim.
Typ
Maxim.
Condition
Internal 1V8 power supply VCC_1V8
1.76V 1.8V
1.94V
V
IL
CMOS -0.5V* 0.54V
V
IH
CMOS 1.33V 2.2V*
V
OL
CMOS
0.4V
I
OL
= - 4 mA
V
OH
CMOS 1.4V
I
OH
= 4 mA
I
OH
4mA
Input / Output pin
I
OL
-
4mA
*Absolute maximum ratings