PIC18F45J10 FAMILY
B.1
Power Requirement Differences
B.3
Oscillator Differences
The most significant difference between the
PIC18F45J10 family and PIC18F4520 device families
is the power requirements. PIC18F45J10 family
devices are designed on a smaller process; this results
in lower maximum voltage and higher leakage current.
PIC18F4520 family devices have a greater range of
oscillator options than PIC18F45J10 family devices.
The latter family is limited primarily to operating modes
that support HS and EC oscillators.
In addition, the PIC18F45J10 family has an internal RC
oscillator with only a fixed 32 kHz output. The higher
frequency RC modes of the PIC18F4520 family are not
available.
The operating voltage range for PIC18F45J10 family
devices is 2.0V to 3.6V. One of the VDD pins is separated
for the core logic supply (VDDCORE). This pin has specific
voltage and capacitor requirements as described in
Section 24.0 “Electrical Characteristics”.
B.4
Peripherals
The current specifications for PIC18F45J10 family
devices are yet to be determined.
The PIC18F45J10 family is able to operate at 40 MHz
down to 2.15 volts unlike the PIC18F4520 family where
40 MHz operation is limited to 4.2 +V applications.
B.2
Pin Differences
Peripherals must also be considered when making a
conversion between the PIC18F45J10 family and the
PIC18F4520 families:
There are several differences in the pinouts between
the PIC18F45J10 family and the PIC18F4520 families:
• Input voltage tolerance
• Output current capabilities
• Available I/O
• Data EEPROM: PIC18F45J10 family devices do
not have this module.
• BOR: PIC18F45J10 family devices do not have a
programmable BOR. Simple brown-out capability
is provided through the use of the internal voltage
regulator (not available in PIC18LFXXJ10
devices).
Pins on the PIC18F45J10 family that have digital only
input capability will tolerate voltages up to 5.5V and are
thus tolerant to voltages above VDD. Table 10-1 in
Section 10.0 “I/O Ports” contains the complete list.
• LVD: PIC18F45J10 family devices do not have
In addition to input differences, there are output differ-
ences as well. Not all I/O pins can source or sink equal
levels of current. Only PORTB and PORTC support the
25 mA source/sink capability that is supported by all
output pins on the PIC18F4520. Table 10-2 in
Section 10.0 “I/O Ports” contains the complete list of
output capabilities.
this module.
• Timer3 (TMR3) has been removed from the
PIC18F45J10 family.
• The T0CKI/C1OUT pins have been moved from
RA4 to RB5.
• The 40/44-pin devices in the PIC18F45J10 family
have a second MSSP module available on pins
RD<3:0>.
There are additional differences in how some pin func-
tions are implemented on PIC18F45J10 family
devices. First, the OSC1/OSC2 oscillator pins are
strictly dedicated to the external oscillator function;
there is no option to re-allocate these pins to I/O (RA6
or RA7) as on PIC18F4520 devices. Second, the
MCLR pin is dedicated only to MCLR and cannot be
configured as an input (RE3). Finally, RA4 does not
exist on PIC18F45J10 family devices.
All of these pin differences (including power pin
differences) should be accounted for when making a
conversion between PIC18F4520 and PIC18F45J10
family devices.
© 2009 Microchip Technology Inc.
DS39682E-page 351
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