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Availability: Obsolete



It's the upgrade of the AT90S8535, but it's also a lot more. This puppy has 7 differential analog inputs, low power oscillators, and SELF PROGRAMMING MEMORY! (Yeah) Not happy with the size of the EEPROM?. No worries, use the entire Flash Memory for your parameters. Or download code upgrades on the fly. And it's still impossible to hack the program memory. This device is also avalable in a 3V version, ATmega163L.


For new designs, you should use ATmega16. The ATmega163 was announced End Of Life in 2002. Last orders need to be in by January 6th 2003, and last delivery is May 6th 2003.


  • pin compatible with 4434, more features.
  • pin compatible with 8535, more features.
  • pin compatible with mega16, less features.
  • pin compatible with mega32, less features.
  • pin compatible with mega323, less features.
  • pin and feature compatible with mega323, less memory.
  • pin compatible with mega8535, more features.

Overview features

Flash EEPROM SRAM Speed Volts
16kB 512B 1024B 0 - 8MHz 4 - 5.5V



General package info

  44-pin TQFP 40-pin PDIP
Package Lead Code 44 40
Carrier Type TRAY TUBE
Max Package Height 1.2  
Body Thickness 1.00 3.81
Body Width 10.00 15.24
Body Length 10.00 52.32
Units per Carrier 160 10
Carriers per Bag 10 20
Units per Bag 1600 200
Quantity per Reel 2000 0
Tape Pitch 16  
Tape Width 24  
Downloadable Files pdf Package Drawing
pdf Tube Tray Drawing
pdf Carrier Tape Drawing
pdf Reel Drawing
pdf Package Drawing
pdf Tube Tray Drawing
Other features Tools
Flash Memory 16 kB
EEPROM Data Memory 512 B
SRAM Data Memory 1024 B
General Purpose Registers (Accumulators) 32
MCU Specific
Clock Frequency 0 - 8 MHz
Supply Voltage 4 - 5.5 V
Sleep Modes 4
Hardware Multiplier Yes
I/O Pins 32
On Chip Oscillator Yes
Interrupts 17
Interrupts, External pins 2
Brown-out Detection Yes
Power-on Reset Yes
Fully Static Operation Yes
Timers / Counters
Timer/Counters (8-bit) 2
Watchdog Timer with On-chip Oscillator Yes
Real Time Counter Yes
Timer/Counters (16-bit) 1
Pulse Width Modulator 3 ch
Analog I/O
Analog Comparator Yes
Analog-to-Digital Converter (10-bit) 8 ch
Programming Modes
In-System Programming via SPI Port Yes
High Voltage Parallel Programming (12V) Yes
Self-Programming via on-chip Boot Program Yes
Serial I/O
Full Duplex Serial Peripheral Interface (SPI) Yes
Full Duplex UART 1
2-wire Serial Interface (I2C compatible) Yes