# 556 series integrated circuits

> read-only memory series

**Wikidata**: [Q131625892](https://www.wikidata.org/wiki/Q131625892)  
**Source**: https://4ort.xyz/entity/556-series-integrated-circuits

## Summary
The 556 series integrated circuits are a model series of read-only memory (ROM) originating from the Soviet Union in 1970. This series complies with the Soviet integrated circuit designation system and is classified as a specific instance of an integrated circuit series.

## Key Facts
- **Inception:** The series was established in 1970.
- **Country of Origin:** Soviet Union.
- **Classification:** It is an instance of an integrated circuit series and a subclass of read-only memory.
- **Design Standard:** The series complies with the Soviet integrated circuit designation.
- **Function:** The series functions as read-only memory.
- **Image Resource:** A visual representation of the series (specifically the КР556РТ11 model) is available on Wikimedia Commons.
- **Wikidata Presence:** The entity has a sitelink count of 1 and is categorized under "556 series integrated circuits" on Wikimedia Commons.

## FAQs
- **What is the primary function of the 556 series integrated circuits?**
  The 556 series functions as read-only memory (ROM), a type of non-volatile memory used in computers and electronic devices to store permanent data.
- **When and where did the 556 series originate?**
  The series was inceptioned in 1970 within the Soviet Union.
- **What naming convention does the 556 series follow?**
  The series complies with the Soviet integrated circuit designation, which organizes integrated circuits into model series sharing the same part prefix.

## Why It Matters
The 556 series represents a specific segment of Soviet electronic engineering history, illustrating the development of memory technology during the Cold War era. As a read-only memory series established in 1970, it played a role in the computing and industrial hardware of the Soviet Union. Its classification under the Soviet integrated circuit designation highlights the structured approach the USSR took toward standardizing electronic components, ensuring compatibility and organization across different hardware developments.

## Notable For
- Being a distinct model series of integrated circuits sharing the same part prefix.
- Serving as a hardware subclass for read-only memory.
- Compliance with the specific Soviet integrated circuit designation standards.
- Originating in the Soviet Union during the early 1970s.

## Body
### Classification and Function
The 556 series is fundamentally defined by its classification as a "read-only memory series." In the hierarchy of electronic components, it is listed as an "instance of" an integrated circuit series. Furthermore, it holds a "subclass of" relationship with read-only memory, indicating that chips within this series are designed specifically for permanent data storage applications. The series is related to the broader category of "integrated circuit series," defined as model series of integrated circuits that share the same part prefix.

### Origin and History
The historical context of the 556 series is rooted in the Soviet Union, which is listed as the country of origin. The series traces its inception to the year 1970. This timeline places the 556 series within the early developmental phases of Soviet microelectronics, aligning with the era's push for standardized electronic manufacturing.

### Standards and Designation
A critical aspect of the 556 series is its compliance with the "Soviet integrated circuit designation." This property indicates that the naming and categorization of the chips within this series follow the specific standardized system used by the Soviet electronics industry. This system ensures that the series is recognized by its specific numeric prefix, "556," which groups these integrated circuits together based on shared technical heritage and functional designation.

### Media and Documentation
The series is documented within digital knowledge bases, specifically possessing a Wikidata description of "read-only memory series." It maintains a presence on Wikimedia Commons, where it is categorized under "556 series integrated circuits." There is a specific image file available for the series, hosted at `https://commons.wikimedia.org/wiki/Special:FilePath/Микросхема_КР556РТ11.jpg`, which depicts a physical example of the hardware (model КР556РТ11). The entity currently has a sitelink count of 1 and is available in the "commons" language category on Wikipedia.