Datasheet

  
  
SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
23
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
Schmitt-trigger inputs − Ports P1 and P2
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
Positive-going input threshold
0.45 0.75 V
CC
V
IT+
Positive-going input threshold
voltage
2.2 V 1.00 1.65
V
V
IT+
voltage
3 V 1.35 2.25
V
Negative-going input threshold
0.25 0.55 V
CC
V
IT−
Negative-going input threshold
voltage
2.2 V 0.55 1.20
V
V
IT−
voltage
3 V 0.75 1.65
V
V
hys
Input voltage hysteresis (V
IT+
−
2.2 V 0.2 1.0
V
V
hys
Input voltage hysteresis (V
IT+
−
V
IT−
)
3 V 0.3 1.0
V
R
Pull
Pull-up/pull-down resistor
For pull-up: V
IN
= V
SS
;
For pull-down: V
IN
= V
CC
20 35 50 kW
C
I
Input Capacitance V
IN
= V
SS
or V
CC
5 pF
inputs − Ports P1 and P2
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
t
(int)
External interrupt timing
Port P1, P2: P1.x to P2.x, External
trigger puls width to set interrupt
flag, (see Note 1)
2.2 V/3 V 20 ns
NOTES: 1. An external signal sets the interrupt flag every time the minimum interrupt puls width t
(int)
is met. It may be set even with trigger signals
shorter than t
(int)
.
leakage current − Ports P1 and P2
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
I
lkg(Px.x)
High-impedance leakage current see Notes 1 and 2 2.2 V/3 V ±50 nA
NOTES: 1. The leakage current is measured with V
SS
or V
CC
applied to the corresponding pin(s), unless otherwise noted.
2. The leakage of the digital port pins is measured individually. The port pin is selected for input and the pull-up/pull-down resistor is
disabled.