General
Table 1. Voltage and current operating requirements (continued)
Symbol
VHYS
Description
Min.
Max.
Unit
Notes
Input hysteresis
0.06 × VDD
—
V
IICDIO
Digital pin negative DC injection current — single pin
• VIN < VSS-0.3V
1
-5
—
mA
mA
IICAIO
Analog2 pin DC injection current — single pin
• VIN < VSS-0.3V (Negative current injection)
• VIN > VDD+0.3V (Positive current injection)
3
-5
—
—
+5
IICcont
Contiguous pin DC injection current —regional limit,
includes sum of negative injection currents or sum of
positive injection currents of 16 contiguous pins
-25
—
—
mA
V
• Negative current injection
• Positive current injection
+25
VRAM
VDD voltage required to retain RAM
1.2
—
1. All digital I/O pins are internally clamped to VSS through a ESD protection diode. There is no diode connection to VDD. If
VIN greater than VDIO_MIN (=VSS-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=(VDIO_MIN-VIN)/|IIC|.
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 VSS and VDD through ESD protection diodes. If VIN is greater than VAIO_MIN
(=VSS-0.3V) and VIN is less than VAIO_MAX(=VDD+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=(VAIO_MIN-VIN)/|IIC|. The positive injection current limiting resistor is
calcualted as R=(VIN-VAIO_MAX)/|IIC|. Select the larger of these two calculated resistances.
5.2.2 LVD and POR operating requirements
Table 2. VDD supply LVD and POR operating requirements
Symbol Description
Min.
0.8
Typ.
1.1
Max.
1.5
Unit
V
Notes
VPOR
Falling VDD POR detect voltage
VLVDH
Falling low-voltage detect threshold — high
range (LVDV=01)
2.48
2.56
2.64
V
Low-voltage warning thresholds — high range
• Level 1 falling (LVWV=00)
1
VLVW1H
VLVW2H
VLVW3H
VLVW4H
2.62
2.72
2.82
2.92
2.70
2.80
2.90
3.00
2.78
2.88
2.98
3.08
V
V
V
V
• Level 2 falling (LVWV=01)
• Level 3 falling (LVWV=10)
• Level 4 falling (LVWV=11)
VHYSH
VLVDL
Low-voltage inhibit reset/recover hysteresis —
high range
—
60
—
mV
V
Falling low-voltage detect threshold — low range
(LVDV=00)
1.54
1.60
1.66
Table continues on the next page...
KL24 Sub-Family Data Sheet Data Sheet, Rev. 3, 9/19/2012.
Freescale Semiconductor, Inc.
11
FREESCALE [ Freescale ]
