ATtiny microcontroller comparison chart explained

ATtiny (also known as TinyAVR) is a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips. The first members of this family were released in 1999 by Atmel (later acquired by Microchip Technology in 2016).^[1]

Features

ATtiny microcontrollers specifically exclude various common features, such as: USB peripheral, DMA controller, crypto engine, or an external memory bus.

The following table summarizes common features of the ATtiny microcontrollers, for easy comparison. This table is not meant to be an unabridged feature list.

Device (family)[2]	data-sort-type="number"	Max clock (MHz) !	data-sort-type="number"	Flash (KiB) !	data-sort-type="number"	SRAM (bytes) !	data-sort-type="number"	EEPROM (bytes) !	USART (UART)	I²C		Timers 16/12/8 (bits)	data-sort-type="number"	ADC pins !	data-sort-type="number"	GPIO pins !		GCC arch ID [3]	Pgm Dbg	Refs
ATtiny11, ATtiny11L	6, 2	1						0 / 0 / 1		5		avr1	HVSP	[4]
ATtiny12, ATtiny12L, ATtiny12V	8, 1.2	1		64				0 / 0 / 1		5		avr1	ISP, HVSP
ATtiny15L	1.6	1		64				0 / 0 / 2	4	6		avr1	ISP, HVSP	[5]
ATtiny28L, ATtiny28V	4, 1.2	2						0 / 0 / 1		11		avr1	HVPP	[6]
														<	-- NOTE - grouping divider -->
ATtiny22, ATtiny22L	8, 4	2	128	128				0 / 0 / 1		5		avr2	ISP, HVSP	[7]
ATtiny26, ATtiny26L	16, 8	2	128	128				0 / 0 / 2	11	16		avr2	ISP, HVPP	[8]
														<	-- NOTE - grouping divider -->
ATtiny13, ATtiny13V, ATtiny13A	20, 10	1	64	64				0 / 0 / 1	4	6		avr25	ISP, dW, HVSP	[9] [10] [11]
ATtiny24, ATtiny24V, ATtiny24A, ATtiny44, ATtiny44V, ATtiny44A, ATtiny84, ATtiny84V, ATtiny84A	20, 10	2, 4, 8	128, 256, 512	128, 256, 512				1 / 0 / 1	8	12		avr25	ISP, dW, HVSP	[12] [13] [14] [15] [16] [17]
ATtiny25, ATtiny25V, ATtiny45, ATtiny45V, ATtiny85, ATtiny85V	20, 10	2, 4, 8	128, 256, 512	128, 256, 512				0 / 0 / 2[18]	4	6		avr25	ISP, dW, HVSP	[19] [20] [21]
ATtiny43U[22]	8	4	256	64				0 / 0 / 2	4	16		avr25	ISP, dW, HVPP	[23]
ATtiny48, ATtiny88	12	4, 8	256, 512	64				1 / 0 / 1	6	24		avr25	ISP, dW, HVPP	[24] [25]
								1 / 0 / 1	8	28
ATtiny87, ATtiny167	16	8, 16	512	512				1 / 0 / 1	11	16		avr25, avr35	ISP, dW, HVPP	[26] [27]
ATtiny261, ATtiny261A, ATtiny461, ATtiny461A, ATtiny861, ATtiny861A	20	2, 4, 8	128, 256, 512	128, 256, 512				1 / 0 / 1[28]	11	16		avr25	ISP, dW, HVPP	[29] [30] [31] [32] [33]
ATtiny441, ATtiny841	16	4, 8	256, 512	256, 512				2 / 0 / 1	12	12		avr25	ISP, dW, HVSP	[34] [35]
ATtiny828	20	8	512	256				1 / 0 / 1	28	28		avr25	ISP, dW, HVPP	[36]
ATtiny1634	12	16	1024	256				1 / 0 / 1	12	18		avr35	ISP, dW, HVPP	[37]
ATtiny2313, ATtiny2313V, ATtiny2313A, ATtiny4313	20	2, 4	128, 256	128, 256				1 / 0 / 1		18		avr25	ISP, dW, HVPP	[38] [39] [40] [41]
														<	-- NOTE - grouping divider -->
ATtiny4, ATtiny5, ATtiny9, ATtiny10	12	0.5 / 1	32					1 / 0 / 0	4 [42]	4		avrtiny	TPI	[43] [44] [45] [46]
ATtiny20	12	2	128					1 / 0 / 1	8	12		avrtiny	TPI	[47]
ATtiny40	12	4	256					1 / 0 / 1	12	18		avrtiny	TPI	[48]
ATtiny102(F)	12	1	32					1 / 0 / 0	5	6		avrtiny	TPI	[49]
ATtiny104(F)	12	1	32					1 / 0 / 0	9	12		avrtiny	TPI	[50]
														<	-- NOTE - grouping divider -->
ATtiny202, ATtiny402 (0-series)	20	2, 4	128, 256	64, 128				2 / 0 / 0 / RTT	6	6		avrxmega3	UPDI	[51] [52]
ATtiny204, ATtiny404, ATtiny804, ATtiny1604 (0-series)	20	2, 4, 8, 16	128, 256, 512, 1024	64, 128, 256				2 / 0 / 0 / RTT	10	12		avrxmega3	UPDI	[53] [54] [55] [56]
ATtiny406, ATtiny806, ATtiny1606 (0-series)	20	4, 8, 16	256, 512, 1024	128, 256				2 / 0 / 0 / RTT	12	18		avrxmega3	UPDI	[57] [58] [59]
ATtiny807, ATtiny1607 (0-series)	20	8, 16	512, 1024	128, 256				2 / 0 / 0 / RTT	12	22		avrxmega3	UPDI	[60] [61]
														<	-- NOTE - grouping divider -->
ATtiny212, ATtiny412 (1-series)	20	2, 4	128, 256	64, 128				2 / 1 / 0 / RTT	6	6		avrxmega3	UPDI	[62] [63]
ATtiny214, ATtiny414, ATtiny814, ATtiny1614 (1-series)	20	2, 4, 8, 16	128, 256, 512, 2048	64, 128, 256				2 / 1 / 0 / RTT	10	12		avrxmega3	UPDI	[64] [65] [66] [67]
ATtiny416, ATtiny816, ATtiny1616, ATtiny3216 (1-series)	20	4, 8, 16, 32	256, 512, 2048	128, 256				2or3 / 1 / 0 / RTT	12	18		avrxmega3	UPDI	[68] [69] [70] [71]
ATtiny417, ATtiny817, ATtiny1617, ATtiny3217 (1-series)	20	4, 8, 16, 32	256, 512, 2048	128, 256				2 / 1 / 0 / RTT	12	22		avrxmega3	UPDI	[72] [73] [74] [75]
														<	-- NOTE - grouping divider -->
ATtiny424, ATtiny824, ATtiny1624, ATtiny3224 (2-series)	20	4, 8, 16, 32	512, 1024, 2048, 3072	128, 128, 256, 256				3 / 0 / 0 / RTT	9	12		avrxmega3	UPDI	[76] [77]
ATtiny426, ATtiny826, ATtiny1626, ATtiny3226 (2-series)	20	4, 8, 16, 32	512, 1024, 2048, 3072	128, 128, 256, 256				3 / 0 / 0 / RTT	15	18		avrxmega3	UPDI	[78] [79]
ATtiny427, ATtiny827, ATtiny1627, ATtiny3227 (2-series)	20	4, 8, 16, 32	512, 1024, 2048, 3072	128, 128, 256, 256				3 / 0 / 0 / RTT	15	22		avrxmega3	UPDI	[80] [81]
Device (family)	Max clock (MHz)	Flash (KiB)	SRAM (bytes)	EEPROM (bytes)	USART (UART)	I²C		Timers 16/12/8/R (bits)	ADC pins	GPIO pins		GCC arch ID	Pgm Dbg	Refs

Notes

• Package column - the number after the dash is the number of pins on the package. DIP packages in this table are 0.3inches row-to-row. SOwww means SOIC package with a case width of 'www' in thousandth of an inch. Though some package types are known by more than one name, a common name was chosen to make it easier to compare packages.

• UART/I²C/SPI columns - means a dedicated peripheral, * means a multi-feature peripheral that is chosen by setting configuration bits. Most USART peripherals support a minimum choice between UART or SPI, where as some might support additional choices, such as LIN, IrDA, RS-485.

• Timers column - more recent families have wider timers and may allow chaining two 16-bit timers to do 32-bit capture. RTT is a 16-bit Real Time Timer that is driven by a 32.768KHz clock, though Microchip calls it RTC for Real Time Counter (easily confused to mean Real Time Clock).

• ADC pins column - the total number of analog channels that are accessible via pins that multiplex into the ADC input. Most parts have one ADC, a few have two ADC.

• Pgm/Dbg column - flash programming and debugging protocols: HVPP means High Voltage Parallel Programming 12V protocol, HVSP means High Voltage Serial Programming 12V protocol, ISP means In-System Programmable protocol, uses SPI to program the internal flash. TPI is Tiny Programming Interface. dW means debugWIRE protocol. UPDI means Unified Program and Debug Interface protocol (newest).^[82]

Abbreviations

• TWI: Many of Atmels microcontrollers contain built-in support for interfacing to a two-wire bus, called Two-Wire Interface. This is essentially the same thing as the I²C interface by Philips, but that term is avoided in Atmel's documentation due to trademark issues.
• USI: Universal Serial Interface (not to be confused with USB). The USI is a multi-purpose hardware communication module. With appropriate software support, it can be used to implement an SPI,^[83] I²C^{[84] [85]} or UART^[86] interface. USART peripherals have more features than USI peripherals.

Timeline

The following table lists each ATtiny microcontroller by the first release date of each datasheet.

Year	Device (family)
1999	ATtiny11, ATtiny11L, ATtiny12, ATtiny12L, ATtiny12V, ATtiny22, ATtiny22L
2002	ATtiny15L, ATtiny26, ATtiny26L, ATtiny28L, ATtiny28V
2003	ATtiny13, ATtiny13V, ATtiny2313, ATtiny2313V, ATtiny4313
2005	ATtiny24, ATtiny24V, ATtiny25, ATtiny25V, ATtiny44, ATtiny44V, ATtiny45, ATtiny45V, ATtiny84, ATtiny84V, ATtiny85, ATtiny85V
2006	ATtiny261, ATtiny461, ATtiny861
2008	ATtiny13A, ATtiny24A, ATtiny44A, ATtiny48, ATtiny84A, ATtiny88
2009	ATtiny4, ATtiny5, ATtiny9, ATtiny10, ATtiny43U, ATtiny261A, ATtiny461A, ATtiny861A, ATtiny2313A
2010	ATtiny20, ATtiny40, ATtiny87, ATtiny167
2011	ATtiny1634
2012	ATtiny441, ATtiny841, ATtiny828
2016	ATtiny102(F), ATtiny104(F), ATtiny417, ATtiny817
2017	ATtiny212, ATtiny412, ATtiny214, ATtiny414, ATtiny814, ATtiny416, ATtiny816
2018	ATtiny202, ATtiny402, ATtiny204, ATtiny404, ATtiny804, ATtiny1604, ATtiny406, ATtiny806, ATtiny1606, ATtiny807, ATtiny1607, ATtiny1614, ATtiny1616, ATtiny3216, ATtiny1617, ATtiny3217
2020	ATtiny1624, ATtiny1626, ATtiny1627
2021	ATtiny424, ATtiny824, ATtiny426, ATtiny826, ATtiny427, ATtiny827

Development boards

The following are ATtiny development boards sold by Microchip Technology:

• ATtiny104 Xplained Nano^[87]
• ATtiny416 Xplained Nano^[88]
• ATtiny817 AVR Parrot^[89]
• ATtiny817 Xplained Mini^[90]
• ATtiny817 Xplained Pro^[91]
• ATtiny3217 Xplained Pro^[92]

See also

• AVR microcontrollers
• Atmel AVR instruction set
• In-system programming
• Arduino

Further reading

ATtiny

• tinyAVR Microcontroller Projects for the Evil Genius; 1st Ed; Dhananjay Gadre, Nehul Malhotra; McGraw-Hill/TAB; 272 pages; 2011; .

AVR

• AVR Programming: Learning to Write Software for Hardware; 1st Ed; Elliot Williams; Maker Media; 474 pages; 2014;
• Some Assembly Required: Assembly Language Programming with the AVR Microcontroller; 1st Ed; Timothy Margush; CRC Press; 643 pages; 2011;
• AVR Microcontroller and Embedded Systems: Using Assembly and C; 1st Ed; Muhammad Ali Mazidi, Sarmad Naimi, Sepehr Naimi; Pearson; 792 pages; 2010; .

External links

• Microchip 8-bit AVR MCU product webpage - Microchip
• Microchip 8-bit AVR MCU product selector (PDF) - Microchip
• Atmel tinyAVR fast and code efficient flyer (PDF) - Microchip
• All tinyAVR parts in a spreadsheet - EDN Magazine, September 8, 2014.
• ATtiny44/84 and ATtiny45/85 Pinout Diagrams

Notes and References

1. Web site: Atmel Product Guide September 1999 . . October 6, 2018 . https://web.archive.org/web/20181006055656/http://ebook.pldworld.com/_semiconductors/Atmel/Databook%20CDROM/Atmel/acrobat/doc0031.pdf . October 6, 2018 . September 1999 . live.
2. http://www.microchip.com/design-centers/8-bit/avr-mcus 8-bit AVR microcontrollers; Microchip.com
3. https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html AVR compiler options; gcc.gnu.org
4. Web site: ATtiny11/ATtiny12 datasheet . . July 9, 2018.
5. Web site: ATtiny15L datasheet . . July 9, 2018.
6. Web site: ATtiny28 webpage . . July 7, 2018.
7. Web site: ATtiny22 datasheet . . July 16, 2018.
8. Web site: ATtiny26 webpage . . July 7, 2018.
9. Web site: ATtiny13 webpage . . July 7, 2018.
10. Web site: ATtiny13A webpage . . July 7, 2018.
11. Web site: AppNote AVR520 - Migrating from ATtiny13 to ATtiny13A . . July 7, 2018.
12. Web site: ATtiny24 webpage . . July 7, 2018.
13. Web site: ATtiny44 webpage . . July 7, 2018.
14. Web site: ATtiny84 webpage . . July 7, 2018.
15. Web site: ATtiny24A webpage . . July 7, 2018.
16. Web site: ATtiny44A webpage . . July 7, 2018.
17. Web site: ATtiny84A webpage . . July 7, 2018.
18. timer0 can use clocks up to the core clock, timer1 can use clocks up to 64MHz
19. Web site: ATtiny25 webpage . . July 7, 2018.
20. Web site: ATtiny45 webpage . . July 7, 2018.
21. Web site: ATtiny85 webpage . . July 7, 2018.
22. Ultra-low voltage model with integrated boost converter that can be powered with only 0.7 volts.
23. Web site: ATtiny43U webpage . . July 7, 2018.
24. Web site: ATtiny48 webpage . . July 9, 2018.
25. Web site: ATtiny88 webpage . . July 9, 2018.
26. Web site: ATtiny87 webpage . . July 9, 2018.
27. Web site: ATtiny167 webpage . . July 9, 2018.
28. timer/counter1 is a 10-bit counter that can use clocks to 64MHz.
29. Web site: ATtiny261A webpage . . July 9, 2018.
30. Web site: ATtiny461 webpage . . July 9, 2018.
31. Web site: ATtiny461A webpage . . July 9, 2018.
32. Web site: ATtiny861 webpage . . July 9, 2018.
33. Web site: ATtiny861A webpage . . July 9, 2018.
34. Web site: ATtiny441 webpage . . July 9, 2018.
35. Web site: ATtiny841 webpage . . July 9, 2018.
36. Web site: ATtiny828 webpage . . July 9, 2018.
37. Web site: ATtiny1634 webpage . . July 9, 2018.
38. Web site: ATtiny2313 webpage . . July 7, 2018.
39. Web site: ATtiny2313A webpage . . July 7, 2018.
40. Web site: ATtiny4313 webpage . . July 7, 2018.
41. Web site: AppNote AVR533 - Migrating from ATtiny2313 to ATtiny2313A . . July 7, 2018.
42. ADC only on ATtiny5/10, and channels are 8 bits instead of 10
43. Web site: ATtiny4 webpage . . July 7, 2018.
44. Web site: ATtiny5 webpage . . July 7, 2018.
45. Web site: ATtiny9 webpage . . July 7, 2018.
46. Web site: ATtiny10 webpage . . July 7, 2018.
47. Web site: ATtiny20 webpage . . July 7, 2018.
48. Web site: ATtiny40 webpage . . July 7, 2018.
49. Web site: ATtiny102 webpage . . July 7, 2018.
50. Web site: ATtiny104 webpage . . July 7, 2018.
51. Web site: ATtiny202 webpage . . July 7, 2018.
52. Web site: ATtiny402 webpage . . July 7, 2018.
53. Web site: ATtiny204 webpage . . July 7, 2018.
54. Web site: ATtiny404 webpage . . July 7, 2018.
55. Web site: ATtiny804 webpage . . July 7, 2018.
56. Web site: ATtiny1604 webpage . . July 7, 2018.
57. Web site: ATtiny406 webpage . . July 7, 2018.
58. Web site: ATtiny806 webpage . . July 7, 2018.
59. Web site: ATtiny1606 webpage . . July 7, 2018.
60. Web site: ATtiny807 webpage . . July 7, 2018.
61. Web site: ATtiny1607 webpage . . July 7, 2018.
62. Web site: ATtiny212 webpage . . July 7, 2018.
63. Web site: ATtiny412 webpage . . July 7, 2018.
64. Web site: ATtiny214 webpage . . July 7, 2018.
65. Web site: ATtiny414 webpage . . July 7, 2018.
66. Web site: ATtiny814 webpage . . July 7, 2018.
67. Web site: ATtiny1614 webpage . . July 7, 2018.
68. Web site: ATtiny416 webpage . . July 7, 2018.
69. Web site: ATtiny816 webpage . . July 7, 2018.
70. Web site: ATtiny1616 webpage . . July 7, 2018.
71. Web site: ATtiny3216 webpage . . July 7, 2018.
72. Web site: ATtiny417 webpage . . July 7, 2018.
73. Web site: ATtiny817 webpage . . July 7, 2018.
74. Web site: ATtiny1617 webpage . . July 7, 2018.
75. Web site: ATtiny3217 webpage . . July 7, 2018.
76. https://www.microchip.com/wwwproducts/en/ATTINY1624 ATtiny1624; Microchip.
77. Web site: ATTINY3224 - 8-bit Microcontrollers. 2021-06-21. www.microchip.com.
78. https://www.microchip.com/wwwproducts/en/ATTINY1626 ATtiny1626; Microchip.
79. Web site: ATTINY3226 - 8-bit Microcontrollers. 2021-06-21. www.microchip.com.
80. https://www.microchip.com/wwwproducts/en/ATTINY1627 ATtiny1627; Microchip.
81. Web site: ATTINY3227 - 8-bit Microcontrollers. 2021-06-21. www.microchip.com.
82. http://studio.download.atmel.com/7.0.1931/as-installer-7.0.1931-readme.pdf Atmel Studio Release Notes; Microchip.com
83. Web site: AVR319: Using the USI module for SPI communication. Atmel. 2004. 10 June 2014.
84. Web site: Atmel AVR310: Using the USI Module as a I²C Master. Atmel. 2013. 10 June 2014.
85. Web site: AVR312: Using the USI module as a I²C slave. Atmel. 2005. 10 June 2014.
86. Web site: AVR307: Half Duplex UART Using the USI Module. Atmel. 2003. 10 June 2014.
87. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY104-XNANO ATtiny104 Xplained Nano board; Microchip.
88. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY416-XNANO ATtiny416 Xplained Nano board; Microchip.
89. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATAVRPARROT ATtiny817 AVR Parrot board; Microchip.
90. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY817-XMINI ATtiny817 Xplained Mini board; Microchip.
91. http://www.microchip.com/Developmenttools/ProductDetails/PartNo/ATTINY817-XPRO ATtiny817 Xplained Pro board; Microchip.
92. http://www.microchip.com/developmenttools/ProductDetails/PartNo/ATTINY3217-XPRO ATtiny3217 Xplained Pro board; Microchip.