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| PartNumber | ATTINY45-20SH | ATTINY45-20SHR | ATTINY45-20SI |
| Description | 8-bit Microcontrollers - MCU 4KB FLASH 256B EE 256B SRAM 20MHz | 8-bit Microcontrollers - MCU 4KB FLASH, 256B EE 256B SRAM - 20MHz | IC MCU 8BIT 4KB FLASH 8SOIC |
| Manufacturer | Microchip | Microchip | Atmel |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | Embedded - Microcontrollers |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | SOIC-8 | SOIC-8 | - |
| Series | ATtiny45 | ATtiny45 | AVRR ATtiny |
| Core | AVR | AVR | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 20 MHz | 20 MHz | - |
| Program Memory Size | 4 kB | 4 kB | 4KB (2K x 16) |
| Data RAM Size | 256 B | 256 B | - |
| ADC Resolution | 10 bit | 10 bit | - |
| Number of I/Os | 6 I/O | 6 I/O | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tube | Reel | Tube |
| Height | 2.16 mm | 2.16 mm | - |
| Length | 5.35 mm | 5.35 mm | - |
| Product | MCU | MCU | - |
| Program Memory Type | Flash | Flash | FLASH |
| Width | 5.4 mm | 5.4 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Data RAM Type | SRAM | SRAM | - |
| Data ROM Size | 256 B | 256 B | - |
| Data ROM Type | EEPROM | EEPROM | - |
| Interface Type | SPI, USI | Serial | - |
| Analog Supply Voltage | - | - | - |
| DAC Resolution | - | - | - |
| I/O Voltage | 1.8 V to 5.5 V | - | - |
| Moisture Sensitive | Yes | Yes | - |
| Number of ADC Channels | 4 Channel | 4 | - |
| Number of Timers/Counters | 2 Timer | 2 Timer | - |
| Processor Series | tinyAVR | tinyAVR | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 95 | 2000 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Tradename | AVR | AVR | - |
| Watchdog Timers | Watchdog Timer | - | - |
| Unit Weight | 0.019048 oz | 0.019048 oz | - |
| Package Case | - | - | 8-SOIC (0.209", 5.30mm Width) |
| Operating Temperature | - | - | -40°C ~ 85°C (TA) |
| Supplier Device Package | - | - | 8-SOIC |
| Number of I O | - | - | 6 |
| Speed | - | - | 20MHz |
| EEPROM Size | - | - | 256 x 8 |
| Core Processor | - | - | AVR |
| RAM Size | - | - | 256 x 8 |
| Peripherals | - | - | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | - | - | USI |
| Voltage Supply Vcc Vdd | - | - | 2.7 V ~ 5.5 V |
| Core Size | - | - | 8-Bit |
| Data Converters | - | - | A/D 4x10b |
| Oscillator Type | - | - | Internal |