Microcontrollers

Results: 77,253
Manufacturer
3M3PEAKAdvanced Micro DevicesAllegro MicroSystemsAMDAnalog Devices Inc.Analog Devices Inc./Maxim IntegratedArduinoAtmelBridgetek Pte Ltd.Broadcom LimitedCypress Semiconductor Corp
Series
-*568xx56F80xxx56F836xx56F837xx56F83xxx56F8xx56F8xxx720/450073S11xx73S12xx
Packaging
-BagBoxBulkCut Tape (CT)Digi-Reel®Electronic DeliveryStripTape & Box (TB)Tape & Reel (TR)TrayTube
Product Status
ActiveDiscontinued at Digi-KeyLast Time BuyNot For New DesignsObsolete
DigiKey Programmable
Not VerifiedVerified
Core Processor
12V180C151SB80C15280C152JB80C18880C19680C196NU80C3180C3280C5180C5280C54
Core Size
4-Bit8-Bit8/16-Bit16-Bit16-Bit Dual-Core16/32-Bit32-Bit32-Bit 10-Core32-Bit 12-Core32-Bit 16-Core32-Bit 24-Core32-Bit 3-Core
Speed
30/20MHz40/20MHz40/30MHz60/30MHz512kHz625kHz1MHz1.2MHz1.6MHz2MHz2.1MHz2.5MHz
Connectivity
1-Wire, CANbus, EBI/EMI, Ethernet, I2C, QSSI, UART/USART, USB OTG1-Wire, CANbus, HDMI, HDTV, HUB75, I2C, QSPI/QSSI, RS485, SCI/SPI, SD CARD, SmartIO, UART/USART, USB 2.0 HOST/SLAVE, VGA1-Wire, EBI/EMI, I2C, QSPI, SPI, UART/USART, USB1-Wire, I2C, PCIF, SPI, UART/USART1-Wire, I2C, SPI, UART/USART, USB1-Wire®, CANbus, EBI/EMI, Ethernet, I2C, SmartCard, SPI, SSI, UART/USART, USB, USB OTG1-Wire®, CANbus, EBI/EMI, Ethernet, SIO, UART/USART1-Wire®, SPI, UART/USART3-Wire SIO, CANbus, I2C, LINbus, UART/USART3-Wire SIO, DALI, I2C, LINbus, UART/USART3-Wire SIO, EBI/EMI, I2C, LINbus, UART/USART3-Wire SIO, I2C, LINbus, SCI, UART/USART
Peripherals
-AC'97, Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDTAC'97, Brown-out Detect/Reset, I2S, LVD, POR, PWM, WDTAC'97, Brown-out Detect/Reset, I2S, POR, PWM, WDTAC'97, DMA, I2S, LCD, POR, PWM, WDTAC'97, DMA, I2S, POR, PWM, WDTAC'97, DMA, LCD, POR, PWM, WDTAC'97, LCD, POR, PWM, WDTAC'97, POR, PWM, WDTADC, COMPARATOR, CORDIC, COUNTER, DAC, EVENT, GOERTZEL, MATH, PRNG, PWM, QUADRATURE DECODE, SCOPE, SmartIO, VIDEOAES, Brown-out Detect/Reset, DMA, I2S, HLVD, POR, PWM, WDTAES, Brown-out Detect/Reset, DMA, I2S, PDR, POR, PWM, SHA, Temp Sensor, TRNG, WDT
Number of I/O
2345678910111213
Program Memory Size
256B (256 x 8)384B (256 x 12)448B (256 x 14)512B (256 x 16)512B (512 x 8)768B (512 x 12)896B (512 x 14)1KB (1K x 8 + 128B)1KB (1K x 8 + 256B)1KB (1K x 8)1KB (512 x 16)1.2KB (1.2K x 8)
Program Memory Type
-Code RAMCRAMEEPROMEPROMEPROM, UVExternal Program MemoryFLASHFLASH (Arduino Bootloader)Flash RAMFLASH, PRAMFRAM
EEPROM Size
8 x 816 x 832 x 864 x 1664 x 8128 x 8192 x 8224 x 8256 x 8512 x 32512 x 8640 x 8
RAM Size
16 x 823 x 824 x 825 x 832 x 836 x 838 x 841 x 860 x 861 x 863 x 864 x 4
Voltage - Supply (Vcc/Vdd)
0V ~ 3.8V0.72V ~ 3.6V0.855V ~ 0.945V0.90V ~ 5.5V0.9V ~ 1.65V0.9V ~ 3.6V0.95V ~ 1.05V0.95V ~ 3.6V0.99V ~ 3.6V1.08V ~ 1.32V1.08V ~ 1.47V1.08V ~ 3.63V
Data Converters
1Y8x10b SAR-A/D - 12b SARA/D - 12bit; D/A - 12bitA/D - 14bit; D/A - 8bitA/D - 16bitA/D - 16bit; D/A - 12bitA/D - 8bit SARA/D 10/12b SARA/D 10/12b SAR; D/A 1x7/8bA/D 10/12b SAR; D/A 2x7bA/D 100 SAR
Oscillator Type
-ExternalExternal, InternalInternalInternal/External
Operating Temperature
-55°C ~ 105°C (TJ)-55°C ~ 125°C (TA)-55°C ~ 125°C (TC)-55°C ~ 150°C (TA)-55°C ~ 210°C (TA)-55°C ~ 220°C (TA)-55°C ~ 225°C (TA)-55°C ~ 85°C (TA)-55°C ~ 95°C (TA)-40°C ~ 100°C (TA)-40°C ~ 105°C-40°C ~ 105°C (TA)
Grade
-Automotive
Qualification
-AEC-Q100
Mounting Type
-Surface MountSurface Mount, Wettable FlankThrough Hole
Supplier Device Package
0-XCEPT6-DFN-EP (3x3)8-CDIP8-DFN (2x3)8-DFN (3x3)8-DFN (4x4)8-DFN-EP (4x4)8-DFN-S (6x5)8-DIP8-HWSON (3x3)8-MSOP8-PDIP
Package / Case
6-VDFN Exposed Pad8-CDIP (0.300", 7.62mm) Window8-DIP (0.300", 7.62mm)8-DIP (0.400", 10.16mm)8-SOIC (0.154", 3.90mm Width)8-SOIC (0.209", 5.30mm Width)8-TSSOP (0.173", 4.40mm Width)8-TSSOP, 8-MSOP (0.118", 3.00mm Width)8-UDFN Exposed Pad8-UFDFN Exposed Pad8-VDFN Exposed Pad8-VFDFN Exposed Pad
Stocking Options
Environmental Options
Media
Marketplace Product
77,253Results

Showing
of 77,253
Mfr Part #
Quantity Available
Price
Series
Package
Product Status
DigiKey Programmable
Core Processor
Core Size
Speed
Connectivity
Peripherals
Number of I/O
Program Memory Size
Program Memory Type
EEPROM Size
RAM Size
Voltage - Supply (Vcc/Vdd)
Data Converters
Oscillator Type
Operating Temperature
Grade
Qualification
Mounting Type
Supplier Device Package
Package / Case
SOT-23-6
ATTINY10-TSHR
IC MCU 8BIT 1KB FLASH SOT23-6
Microchip Technology
94,323
In Stock
1 : $0.81000
Cut Tape (CT)
4,500 : $0.64102
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
AVR
8-Bit
12MHz
-
POR, PWM, WDT
4
1KB (512 x 16)
FLASH
-
32 x 8
1.8V ~ 5.5V
A/D 4x8b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
SOT-23-6
ATTINY4-TSHR
IC MCU 8BIT 512B FLASH SOT23-6
Microchip Technology
84,118
In Stock
1 : $0.81000
Cut Tape (CT)
4,500 : $0.64102
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
AVR
8-Bit
12MHz
-
POR, PWM, WDT
4
512B (256 x 16)
FLASH
-
32 x 8
1.8V ~ 5.5V
-
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
SOT-23-6
ATTINY10-TS8R
IC MCU 8BIT 1KB FLASH SOT23-6
Microchip Technology
11,540
In Stock
1 : $0.81000
Cut Tape (CT)
4,500 : $0.64102
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
AVR
8-Bit
10MHz
-
POR, PWM, WDT
4
1KB (512 x 16)
FLASH
-
32 x 8
1.8V ~ 5.5V
A/D 4x8b
Internal
-40°C ~ 125°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
8-SOIC
ATTINY202-SSNR
IC MCU 8BIT 2KB FLASH 8SOIC
Microchip Technology
37,774
In Stock
1 : $0.92000
Cut Tape (CT)
4,000 : $0.78755
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
AVR
8-Bit
20MHz
I2C, IrDA, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
6
2KB (2K x 8)
FLASH
64 x 8
128 x 8
1.8V ~ 5.5V
A/D 6x10b
Internal
-40°C ~ 105°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
8-SOIC
ATTINY202-SSFR
IC MCU 8BIT 2KB FLASH 8SOIC
Microchip Technology
27,324
In Stock
1 : $0.92000
Cut Tape (CT)
4,000 : $0.78755
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
AVR
8-Bit
16MHz
I2C, IrDA, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
6
2KB (2K x 8)
FLASH
64 x 8
128 x 8
2.7V ~ 5.5V
A/D 6x10b
Internal
-40°C ~ 125°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
8-SOIC
ATTINY402-SSNR
IC MCU 8BIT 4KB FLASH 8SOIC
Microchip Technology
15,236
In Stock
1 : $0.92000
Cut Tape (CT)
4,000 : $0.78755
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
AVR
8-Bit
20MHz
I2C, IrDA, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
6
4KB (4K x 8)
FLASH
128 x 8
256 x 8
1.8V ~ 5.5V
A/D 6x10b
Internal
-40°C ~ 105°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
8-DFN
PIC16F15213T-I/MF
IC MCU 8BIT 3.5KB FLASH 8DFN
Microchip Technology
3,032
In Stock
1 : $0.95000
Cut Tape (CT)
3,300 : $0.91575
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
PIC
8-Bit
32MHz
I2C, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
5
3.5KB (2K x 14)
FLASH
-
256 x 8
1.8V ~ 5.5V
A/D 5/2x10b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
8-DFN (3x3)
8-VDFN Exposed Pad
8-DFN
PIC16F15213-E/MF
IC MCU 8BIT 3.5KB FLASH 8DFN
Microchip Technology
4,320
In Stock
1 : $0.99000
Tube
Tube
Active
Not Verified
PIC
8-Bit
32MHz
I2C, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
5
3.5KB (2K x 14)
FLASH
-
256 x 8
1.8V ~ 5.5V
A/D 5/2x10b
Internal
-40°C ~ 125°C (TA)
-
-
Surface Mount
8-DFN (3x3)
8-VDFN Exposed Pad
SOT-23-6
PIC10F200T-I/OT
IC MCU 8BIT 384B FLASH SOT23-6
Microchip Technology
29,180
In Stock
1 : $1.06000
Cut Tape (CT)
3,000 : $0.93864
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
4MHz
-
POR, WDT
3
384B (256 x 12)
FLASH
-
16 x 8
2V ~ 5.5V
-
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
8-SOIC
ATTINY412-SSNR
IC MCU 8BIT 4KB FLASH 8SOIC
Microchip Technology
8,538
In Stock
1 : $1.06000
Cut Tape (CT)
4,000 : $0.86081
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
AVR
8-Bit
20MHz
I2C, IrDA, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, WDT
6
4KB (4K x 8)
FLASH
128 x 8
256 x 8
1.8V ~ 5.5V
A/D 6x10b; D/A 1x8b
Internal
-40°C ~ 105°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
SOT-23-6
PIC10F202T-I/OT
IC MCU 8BIT 768B FLASH SOT23-6
Microchip Technology
62,723
In Stock
1 : $1.17000
Cut Tape (CT)
3,000 : $1.03022
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
4MHz
-
POR, WDT
3
768B (512 x 12)
FLASH
-
24 x 8
2V ~ 5.5V
-
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
ATTINY44V-15SST
ATTINY404-SSNR
IC MCU 8BIT 4KB FLASH 14SOIC
Microchip Technology
9,482
In Stock
1 : $1.17000
Cut Tape (CT)
3,000 : $0.98902
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
AVR
8-Bit
20MHz
I2C, SPI, UART/USART
Brown-out Detect/Reset, POR, PWM, WDT
12
4KB (4K x 8)
FLASH
128 x 8
256 x 8
1.8V ~ 5.5V
A/D 10x10b
Internal
-40°C ~ 105°C (TA)
-
-
Surface Mount
14-SOIC
14-SOIC (0.154", 3.90mm Width)
8-UDFN; 8MA4
ATTINY4-MAHR
IC MCU 8BIT 512B FLASH 8UDFN
Microchip Technology
4,150
In Stock
1 : $1.23000
Cut Tape (CT)
3,000 : $1.02565
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
AVR
8-Bit
12MHz
-
POR, PWM, WDT
4
512B (256 x 16)
FLASH
-
32 x 8
1.8V ~ 5.5V
-
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
8-UDFN, USON
8-UFDFN Exposed Pad
ATTINY44V-15SST
ATTINY414-SSNR
IC MCU 8BIT 4KB FLASH 14SOIC
Microchip Technology
5,576
In Stock
1 : $1.25000
Cut Tape (CT)
3,000 : $1.06227
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
AVR
8-Bit
20MHz
I2C, IrDA, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, WDT
12
4KB (4K x 8)
FLASH
128 x 8
256 x 8
1.8V ~ 5.5V
A/D 10x10b; D/A 1x8b
Internal
-40°C ~ 105°C (TA)
-
-
Surface Mount
14-SOIC
14-SOIC (0.154", 3.90mm Width)
SOT-23-6
PIC10F222T-I/OT
IC MCU 8BIT 768B FLASH SOT23-6
Microchip Technology
191,665
In Stock
1 : $1.26000
Cut Tape (CT)
3,000 : $1.09890
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
8MHz
-
POR, WDT
4
768B (512 x 12)
FLASH
-
23 x 8
2V ~ 5.5V
A/D 2x8b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
SOT-23-6
PIC10F206T-I/OT
IC MCU 8BIT 768B FLASH SOT23-6
Microchip Technology
39,105
In Stock
1 : $1.26000
Cut Tape (CT)
3,000 : $1.06227
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
4MHz
-
POR, WDT
3
768B (512 x 12)
FLASH
-
24 x 8
2V ~ 5.5V
-
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
RP2040
SC0914(13)
IC MCU 32BIT EXT MEM 56QFN
Raspberry Pi
23,631
In Stock
1 : $1.28000
Cut Tape (CT)
3,400 : $1.28205
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
ARM® Cortex®-M0+
32-Bit Dual-Core
133MHz
I2C, IrDA, QSPI, SPI, UART/USART, USB
Brown-out Detect/Reset, DMA, I2S, LCD, POR, PWM, WDT
30
-
External Program Memory
-
264K x 8
1.8V ~ 3.3V
A/D 4x12b SAR
External, Internal
-40°C ~ 85°C (TC)
-
-
Surface Mount
56-QFN (7x7)
56-VFQFN Exposed Pad
SOT-23-6
PIC10F322T-I/OT
IC MCU 8BIT 896B FLASH SOT23-6
Microchip Technology
8,513
In Stock
1 : $1.28000
Cut Tape (CT)
3,000 : $1.06227
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
16MHz
-
Brown-out Detect/Reset, POR, PWM, WDT
3
896B (512 x 14)
FLASH
-
64 x 8
2.3V ~ 5.5V
A/D 3x8b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
20-VFQFN Exposed Pad
ATTINY406-MNR
IC MCU 8BIT 4KB FLASH 20VQFN
Microchip Technology
27,421
In Stock
1 : $1.30000
Cut Tape (CT)
6,000 : $1.08059
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
AVR
8-Bit
20MHz
I2C, SPI, UART/USART
Brown-out Detect/Reset, POR, WDT
18
4KB (4K x 8)
FLASH
128 x 8
256 x 8
1.8V ~ 5.5V
A/D 12x10b
Internal
-40°C ~ 105°C (TA)
-
-
Surface Mount
20-VQFN (3x3)
20-VFQFN Exposed Pad
ATTINY44V-15SST
ATTINY414-SSFR
IC MCU 8BIT 4KB FLASH 14SOIC
Microchip Technology
27,023
In Stock
1 : $1.30000
Cut Tape (CT)
3,000 : $1.08059
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
AVR
8-Bit
16MHz
I2C, IrDA, LINbus, SPI, UART/USART
Brown-out Detect/Reset, POR, WDT
12
4KB (4K x 8)
FLASH
128 x 8
256 x 8
2.7V ~ 5.5V
A/D 10x10b; D/A 1x8b
Internal
-40°C ~ 125°C (TA)
-
-
Surface Mount
14-SOIC
14-SOIC (0.154", 3.90mm Width)
SOT-23-6
PIC10F320T-E/OT
IC MCU 8BIT 448B FLASH SOT23-6
Microchip Technology
7,849
In Stock
1 : $1.30000
Cut Tape (CT)
3,000 : $1.08059
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
16MHz
-
Brown-out Detect/Reset, POR, PWM, WDT
3
448B (256 x 14)
FLASH
-
64 x 8
2.3V ~ 5.5V
A/D 3x8b
Internal
-40°C ~ 125°C (TA)
-
-
Surface Mount
SOT-23-6
SOT-23-6
8-SOIC
PIC12LF1571-I/SN
IC MCU 8BIT 1.75KB FLASH 8SOIC
Microchip Technology
7,391
In Stock
1 : $1.30000
Tube
Tube
Active
Verified
PIC
8-Bit
32MHz
-
Brown-out Detect/Reset, POR, PWM, WDT
6
1.75KB (1K x 14)
FLASH
-
128 x 8
1.8V ~ 3.6V
A/D 4x10b; D/A 1x5b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
8 SOIC
PIC12F1571-I/SN
IC MCU 8BIT 1.75KB FLASH 8SOIC
Microchip Technology
6,480
In Stock
1 : $1.30000
Tube
Tube
Active
Verified
PIC
8-Bit
32MHz
-
Brown-out Detect/Reset, POR, PWM, WDT
6
1.75KB (1K x 14)
FLASH
-
128 x 8
2.3V ~ 5.5V
A/D 4x10b; D/A 1x5b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
8 SOIC
PIC12F1571T-I/SN
IC MCU 8BIT 1.75KB FLASH 8SOIC
Microchip Technology
34,280
In Stock
1 : $1.32000
Cut Tape (CT)
3,300 : $1.08058
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Verified
PIC
8-Bit
32MHz
-
Brown-out Detect/Reset, POR, PWM, WDT
6
1.75KB (1K x 14)
FLASH
-
128 x 8
2.3V ~ 5.5V
A/D 4x10b; D/A 1x5b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
8-SOIC
8-SOIC (0.154", 3.90mm Width)
8-MSOP
PIC12F1571T-I/MS
IC MCU 8BIT 1.75KB FLASH 8MSOP
Microchip Technology
6,832
In Stock
1 : $1.32000
Cut Tape (CT)
2,500 : $1.08058
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
PIC
8-Bit
32MHz
-
Brown-out Detect/Reset, POR, PWM, WDT
6
1.75KB (1K x 14)
FLASH
-
128 x 8
2.3V ~ 5.5V
A/D 4x10b; D/A 1x5b
Internal
-40°C ~ 85°C (TA)
-
-
Surface Mount
8-MSOP
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Showing
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Microcontrollers


Microcontroller products are relatively complex, user-programmable digital logic devices. Closely related to devices considered microprocessors, the distinction between the two reduces largely to the manufacturer's choice of noun, though by tradition microcontrollers integrate working memory, are more likely to incorporate mixed-signal peripherals and tend to be used with simpler software paradigms oriented toward repetitive execution of a predefined series of tasks.