ATtiny2313系列过去的型号都停产了，目前都是新型号ATtiny2313A系列来替代。以下是官方提供的相关区别说明：
1 Introduction
In order to optimize the manufacturing process and to further reduce current consumption, an optimized version of ATtiny2313 has been introduced.
The ATtiny2313A is a functionally identical, drop-in replacement for the ATtiny2313. All devices are subject to the same qualification process and same set of production tests, but as the manufacturing process is not the same some electrical characteristics differ.
ATtiny2313 and ATtiny2313A have separate datasheets. This application note outlines the differences between the two devices and the datasheets. There is also a detailed change log to assist the user at the end of the ATtiny2313A datasheet. Remember to always use the latest revision of the device datasheet.
Minor differences in typical characteristics are not discussed in this document as long as the low and high limits remain the same. For detailed information about the typical characteristics, see sections “Electrical Characteristics” and “Typical Characteristics” of the device datasheets.
Note: This application note serves as a guide to ease migration. For complete device details, always refer to the most recent version of the ATtiny2313A data sheet.
2 Changes in Characteristics
This section outlines such differences in characteristics that may have an effect on the application in which the device is used. For detailed information, refer to the most recent version of the device data sheets.
2.1 Current Consumption
Active and Idle mode current consumption of the device have been reduced. The table below present typical current consumption figures at room temperature. All values are taken from device datasheets.
2.2 Reset
The table below summarizes the differences between the reset circuitry of ATtiny2313 and that of ATtiny2313A.
3 New or Updated Bits and Registers
In Table 3-1 are listed registers and bits that have been added or changed to the device as a result of functional enhancements. Some bits were marked as reserved in ATtiny2313 and some bits have another use in ATtiny2313A.
For more details on the functional enhancements, see ATtiny2313A datasheet.
4 Datasheet Changes
For a summary of changes, see the revision history at the end of the ATtiny2313A data sheet.
