Datasheet ATmega328/P - Summary (Microchip) - 6

3. Ordering Information 3.1. ATmega328 Speed [MHz](3) Power Supply [V] Ordering Code(2) Package(1) Operational Range
20 1.8 - 5.5 ATmega328-AU 32A Industrial ATmega328-AUR(5) 32A (-40°C to 85°C) ATmega328-MMH(4) 28M1 ATmega328-MMHR(4)(5) 28M1 ATmega328-MU 32M1-A ATmega328-MUR(5) 32M1-A ATmega328-PU 28P3
Note: 
1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information and minimum quantities. 2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances (RoHS directive). Also Halide free and fully Green. 3. Please refer to Speed Grades for Speed vs. VCC 4. Tape & Reel. 5. NiPdAu Lead Finish.
Package Type
28M1 28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/ MLF) 28P3 28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP) 32M1-A 32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/ MLF) 32A 32-lead, Thin (1.0mm) Plastic Quad Flat Package (TQFP) Atmel ATmega328/P [DATASHEET] 6 Atmel-42735B-328/P_Datasheet_Summary-11/2016 Document Outline Introduction Feature Table of Contents 1. Description 2. Configuration Summary 3. Ordering Information 3.1. ATmega328 3.2. ATmega328P 4. Block Diagram 5. Pin Configurations 5.1. Pin-out 5.2. Pin Descriptions 5.2.1. VCC 5.2.2. GND 5.2.3. Port B (PB[7:0]) XTAL1/XTAL2/TOSC1/TOSC2 5.2.4. Port C (PC[5:0]) 5.2.5. PC6/RESET 5.2.6. Port D (PD[7:0]) 5.2.7. AVCC 5.2.8. AREF 5.2.9. ADC[7:6] (TQFP and VFQFN Package Only) 6. I/O Multiplexing 7. Resources 8. Data Retention 9. About Code Examples 10. Capacitive Touch Sensing 10.1. QTouch Library 11. Packaging Information 11.1. 32-pin 32A 11.2. 32-pin 32M1-A 11.3. 28-pin 28M1 11.4. 28-pin 28P3