General
5.2 Nonswitching electrical specifications
5.2.1 Voltage and current operating requirements
Table 1. Voltage and current operating requirements
Symbol
Description
Min.
Max.
Unit
Notes
VDD
Supply voltage
1.71
3.6
V
VDDA
Analog supply voltage
1.71
–0.1
–0.1
1.71
3.6
0.1
0.1
3.6
V
V
V
V
VDD – VDDA VDD-to-VDDA differential voltage
VSS – VSSA VSS-to-VSSA differential voltage
VBAT
VIH
RTC battery supply voltage
Input high voltage
• 2.7 V ≤ VDD ≤ 3.6 V
• 1.7 V ≤ VDD ≤ 2.7 V
0.7 × VDD
—
—
V
V
0.75 × VDD
VIL
Input low voltage
• 2.7 V ≤ VDD ≤ 3.6 V
• 1.7 V ≤ VDD ≤ 2.7 V
—
—
0.35 × VDD
0.3 × VDD
V
V
VHYS
IICDIO
Input hysteresis
0.06 × VDD
-5
—
—
V
Digital pin negative DC injection current — single pin
• VIN < VSS-0.3V
1
3
mA
Analog2, EXTAL, and XTAL pin DC injection current
— single pin
IICAIO
mA
-5
—
• VIN < VSS-0.3V (Negative current injection)
• VIN > VDD+0.3V (Positive current injection)
—
+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
• Negative current injection
• Positive current injection
+25
VRAM
VDD voltage required to retain RAM
1.2
—
—
V
V
VRFVBAT
VBAT voltage required to retain the VBAT register file
VPOR_VBAT
1. All 5 V tolerant 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.
K51 Sub-Family Data Sheet, Rev. 2, 4/2012.
12
Freescale Semiconductor, Inc.
FREESCALE [ Freescale ]
