Datasheet

© 2008 Microchip Technology Inc. DS39631E-page 395
PIC18F2420/2520/4420/4520
APPENDIX A: REVISION HISTORY
Revision A (June 2004)
Original data sheet for PIC18F2420/2520/4420/4520
devices.
Revision B (January 2007)
This revision includes updates to the packaging
diagrams.
Revision C (June 2007)
This revision includes updates to Section 6.0 “Flash
Program Memory”, Section 23.0 “Special Features
of the CPU”, Section 26.0 “Electrical Characteris-
tics” and minor corrections applicable to Timer1,
EUSART and the packaging diagrams. Also added the
125°C specifications.
Revision D (July 2007)
This revision updated the extended temperature
information in Section 26.0 “Electrical Characteris-
tics”.
Revision E (October 2008)
This revision updated Section 26.0 “Electrical Charac-
teristics”, Section 27.0 “DC and AC Characteristics
Graphs and Tables” and Section 28.0 “Packaging
Information”.
APPENDIX B: DEVICE
DIFFERENCES
The differences between the devices listed in this data
sheet are shown in Table B-1.
TABLE B-1: DEVICE DIFFERENCES
Features PIC18F2420 PIC18F2520 PIC18F4420 PIC18F4520
Program Memory (Bytes)
16384 32768 16384 32768
Program Memory (Instructions) 8192 16384 8192 16384
Interrupt Sources 19 19 20 20
I/O Ports Ports A, B, C, (E) Ports A, B, C, (E) Ports A, B, C, D, E Ports A, B, C, D, E
Capture/Compare/PWM Modules 2 2 1 1
Enhanced
Capture/Compare/PWM Modules
00 1 1
Parallel Communications (PSP) No No Yes Yes
10-Bit Analog-to-Digital Module 10 Input Channels 10 Input Channels 13 Input Channels 13 Input Channels
Packages 28-Pin SPDIP
28-Pin SOIC
28-Pin QFN
28-Pin SPDIP
28-Pin SOIC
28-Pin QFN
40-Pin PDIP
44-Pin TQFP
44-Pin QFN
40-Pin PDIP
44-Pin TQFP
44-Pin QFN