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SLAS826F – MARCH 2015 – REVISED MARCH 2017
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Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
5.25.5 Digital I/Os
lists the characteristics of the digital inputs.
(1)
The input leakage current is measured with V
SS
or V
CC
applied to the corresponding pins, unless otherwise noted.
(2)
The input leakage of the digital port pins is measured individually. The port pin is selected for input and the pullup/pulldown resistor is
disabled.
(3)
An external signal sets the interrupt flag every time the minimum interrupt pulse duration t
int
is met. It may be set by trigger signals
shorter than t
int
.
(4)
A trigger pulse duration less than the MIN value is always filtered, and a trigger pulse duration more than the MAX value is always
passed. The trigger pulse may or may not be filtered if the duration is between the MIN and MAX values.
(5)
Not applicable if RSTn/NMI pin configured as NMI.
Table 5-22. Digital Inputs (Applies to Both Normal and High-Drive I/Os)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
V
IT+
Positive-going input threshold voltage
2.2 V
0.99
1.65
V
3 V
1.35
2.25
V
IT–
Negative-going input threshold voltage
2.2 V
0.55
1.21
V
3 V
0.75
1.65
V
hys
Input voltage hysteresis (V
IT+
– V
IT–
)
2.2 V
0.32
0.84
V
3 V
0.4
1.0
R
Pull
Pullup or pulldown resistor
For pullup: V
IN
= V
SS
,
For pulldown: V
IN
= V
CC
20
30
40
k
Ω
C
I,dig
Input capacitance, digital only port pins
V
IN
= V
SS
or V
CC
3
pF
C
I,ana
Input capacitance, port pins shared with
analog functions
V
IN
= V
SS
or V
CC
5
pF
I
lkg,ndio
Normal I/O high-impedance input leakage
current
See
(1) (2)
2.2 V, 3 V
±20
nA
I
lkg,hdio
High-drive I/O high-impedance input leakage
current
See
(1) (2)
2.2 V, 3 V
±20
nA
t
int
External interrupt timing (external trigger
pulse duration to set interrupt flag)
Ports with interrupt capability and
without glitch filter
(3)
2.2 V, 3 V
20
ns
Ports with interrupt capability and
with glitch filter but glitch filter
disabled (GLTFLT_EN = 0)
(3)
2.2 V, 3 V
20
Ports with interrupt capability and
with glitch filter, glitch filter enabled
(GLTFTL_EN = 1)
(4)
2.2 V, 3 V
0.25
1
µs
t
RST
External reset pulse duration on RSTn pin
(5)
2.2 V, 3 V
1
µs