AVR Parts comparison

Part FLASH SRAM EEPROM I/O pins Max speed Voltage range T/C Ext. intr. Analog comp. RC osc. ADC UART SPI Comments
AT90S1200 1K No 64 15 12 MHz 2.7-6.0V 1 8-bit 1 Yes Yes No No No
AT90S2313 2K 128 128 15 10 MHz 2.7-6.0V 1 8-bit, 1 16-bit 2 Yes No No Yes No
AT90S2323 2K 128 128 3 10 MHz 4.0-6.0V 1 8-bit 1 No No No No No
AT90S2343 2K 128 128 5 10 MHz 4.0-6.0V 1 8-bit 1 No Yes No No No No XTAL osc.
AT90S2333 2K 128 128 20 8 MHz 4.0-6.0V 1 8-bit, 1 16-bit 2 Yes No 6 channel,
10-bit		 Yes Yes Brown-out, enhanced POR
AT90S4433 4K 256 128 20 8 MHz 4.0-6.0V 1 8-bit, 1 16-bit 2 Yes No 6 channel, 10-bit Yes Yes Brown-out, enhanced POR
AT90S4434 4K 256 256 32 8 MHz 4.0-6.0V 2 8-bit, 1 16-bit 2 Yes No 8 channel, 10-bit Yes Yes RTC
AT90S8535 8K 512 512 32 8 MHz 4.0-6.0V 2 8-bit, 1 16-bit 2 Yes No 8 channel, 10-bit Yes Yes RTC
AT90C8534 8K 256 512 7 1.5MHz 3.3-6.0V 1 8-bit, 1 16-bit 2 No No 6 channel, 10 bit No No Low-power
AT90S4414 4K 256 256 32 8 MHz (4.0-6.0V)
4 MHz (2.7-4.0V)		 2.7-6.0V 1 8-bit, 1 16-bit 2 Yes No No Yes Yes
AT90S8515 8K 512 512 32 8 MHz (4.0-6.0V)
4 MHz (2.7-4.0V)		 2.7-6.0V 1 8-bit, 1 16-bit 2 Yes No No Yes Yes
ATmega103 128K 4K 4K 32+8+8 6 MHz 4.0-5.5V 2 8-bit, 1 16-bit 8 Yes No 8 channel, 10-bit Yes Yes RTC, XTAL divider
ATmega603 64K 2K 4K 32+8+8 6 MHz 4.0-5.5V 2 8-bit, 1 16-bit 8 Yes No 8 channel, 10-bit Yes Yes RTC, XTAL divider
ATmega161 16K 1K 512 35 8MHz 4.0-5.5V 1 16-bit, 2 8-bit 2 Yes No No 2 Yes RTC, Self-programmable flash, MUL instruction
ATtiny10 1K No No 5+1+0 6 MHz 4.0-5.5V 1 8-bit 1 Yes No No No No QuickFlash
ATtiny11 1K No No 5+1+0 6 MHz 4.0-5.5V 1 8-bit 1 Yes No No No No No ISP
ATtiny12 1K No 64 6 8 MHz 4.0-5.5V 1 8-bit 1 Yes Yes No No No Enhanced POR, internal calibrated RC osc.
ATtiny22 2K 128 128 5 8 MHz 4.0-6.0V 1 8-bit 1 No Yes No No No
POR=Power on reset, XTAL=Crystal, HW=Hardware, RTC=Real-time clock, ISP=In-system programmable

The I/O lines is in the format : General I/O+Input+Output

LS versions (available for 2323, 2343, 4433, 4434, 8535) are the same as S, except : Voltage range 2.7-6.0V, Max. speed 4 MHz.
L versions (available for mega103, mega603, mega161) are the same as the non-L parts, except : Voltage range 2.7-3.6V (2.7-5.5 for mega161), Max. speed 4 MHz.
L versions (tiny10, tiny11, tiny12, tiny22) are the same as non-L parts, except : Voltage range 2.7-5.5V (tiny10, tiny11, tiny12), 2.7-6.0V (tiny22) Max. speed 2 MHz (tiny10, tiny11), 4 MHz (tiny12, tiny22).
V versions (tiny12) are the same as non-V parts, except : Voltage range 1.8-5.5V, Max. speed 1 MHz.

All AVR parts have 32 registers, Watchdog timer and low-power modes (details vary).

All AVR parts without SRAM have a 3 entry HW stack

Note that parts marked QuickFlash do not have serial programming, all others can be programmed via a 6-pin serial interface.
 

Instruction set

All AVRs have the same rich core instruction set, with the following exceptions : Currently, only the ATmega161 supports the MUL instruction.
 

Disclaimer

All the information in this page was compiled from the summary datasheets on Atmel's website.

Page written by Karl H. Torvmark. Any comments about this page are welcome.
Last updated 08.10.99.