General
Table 1. Voltage and current operating requirements (continued)
Symbol
V
HYS
I
ICDIO
Description
Input hysteresis
Digital pin negative DC injection current — single pin
• V
IN
< V
SS
-0.3V
I
ICAIO
Analog
pin DC injection current — single pin
• V
IN
< V
SS
-0.3V (Negative current injection)
• V
IN
> V
DD
+0.3V (Positive current injection)
I
ICcont
Contiguous pin DC injection current —regional limit,
includes sum of negative injection currents or sum of
positive injection currents of 16 contiguous pins
• Negative current injection
• Positive current injection
V
RAM
V
DD
voltage required to retain RAM
mA
-5
—
—
+5
-5
—
mA
Min.
0.06 × V
DD
Max.
—
Unit
V
Notes
-25
—
1.2
—
+25
—
mA
V
1. All digital I/O pins are internally clamped to V
SS
through a ESD protection diode. There is no diode connection to V
DD
. If
V
IN
greater than V
DIO_MIN
(=V
SS
-0.3V) is observed, then there is no need to provide current limiting resistors at the pads. If
this limit cannot be observed then a current limiting resistor is required. The negative DC injection current limiting resistor
is calculated as R=(V
DIO_MIN
-V
IN
)/|I
IC
|.
2. Analog pins are defined as pins that do not have an associated general purpose I/O port function.
3. All analog pins are internally clamped to V
SS
and V
DD
through ESD protection diodes. If V
IN
is greater than V
AIO_MIN
(=V
SS
-0.3V) and V
IN
is less than V
AIO_MAX
(=V
DD
+0.3V) is observed, then there is no need to provide current limiting
resistors at the pads. If these limits cannot be observed then a current limiting resistor is required. The negative DC
injection current limiting resistor is calculated as R=(V
AIO_MIN
-V
IN
)/|I
IC
|. The positive injection current limiting resistor is
calcualted as R=(V
IN
-V
AIO_MAX
)/|I
IC
|. Select the larger of these two calculated resistances.
5.2.2 LVD and POR operating requirements
Table 2. V
DD
supply LVD and POR operating requirements
Symbol
V
POR
V
LVDH
Description
Falling VDD POR detect voltage
Falling low-voltage detect threshold — high
range (LVDV=01)
Low-voltage warning thresholds — high range
V
LVW1H
V
LVW2H
V
LVW3H
V
LVW4H
V
HYSH
V
LVDL
• Level 1 falling (LVWV=00)
• Level 2 falling (LVWV=01)
• Level 3 falling (LVWV=10)
• Level 4 falling (LVWV=11)
Low-voltage inhibit reset/recover hysteresis —
high range
Falling low-voltage detect threshold — low range
(LVDV=00)
2.62
2.72
2.82
2.92
—
1.54
2.70
2.80
2.90
3.00
±60
1.60
2.78
2.88
2.98
3.08
—
1.66
V
V
V
V
mV
V
Min.
0.8
2.48
Typ.
1.1
2.56
Max.
1.5
2.64
Unit
V
V
Notes
Table continues on the next page...
KL24 Sub-Family Data Sheet Data Sheet, Rev. 3, 9/19/2012.
Freescale Semiconductor, Inc.
11
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
