PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 81
PIC18F-LF1XK50
Manufacturer Part Number
PIC18F-LF1XK50
Description
20-Pin USB Flash Microcontrollers
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F-LF1XK50.pdf
(420 pages)
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8.0
The
PIC18LF1XK50 devices due to an internal Low
Dropout (LDO) voltage regulator. The PIC18F1XK50
contain an internal LDO, while the PIC18LF1XK50 do
not.
The lithography of the die allows a maximum operating
voltage of the nominal 3.6V on the internal digital logic.
In order to continue to support 5.0V designs, a LDO
voltage regulator is integrated on the die. The LDO
voltage regulator allows for the internal digital logic to
operate at 3.3V, while I/O’s operate at 5.0V (V
The LDO voltage regulator requires an external bypass
capacitor for stability. The V
an external bypass capacitor. It is recommended that
the capacitor be a ceramic cap between 0.22 to 0.47 µF.
On power-up, the external capacitor will look like a
large load on the LDO voltage regulator. To prevent
erroneous operation, the device is held in Reset while
a constant current source charges the external
capacitor. After the cap is fully charged, the device is
released from Reset. For more information, refer to
Section 27.0 “Electrical
2010 Microchip Technology Inc.
PIC18F1XK50
LOW DROPOUT (LDO)
VOLTAGE REGULATOR
devices
Specifications”.
USB
pin is required to have
differ
PIC18F1XK50/PIC18LF1XK50
from
DD
).
Preliminary
the
DS41350E-page 81
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