# 490 series integrated circuits

> series of Soviet seven-segment LED displays with built-in decoder chips

**Wikidata**: [Q120061039](https://www.wikidata.org/wiki/Q120061039)  
**Source**: https://4ort.xyz/entity/490-series-integrated-circuits

## Summary
The 490 series integrated circuits are a Soviet model series of seven-segment LED displays with built-in decoder chips, designed for displaying decimal numerals. Introduced in 1982, these integrated circuits combine the display and decoding functions in a single package, following Soviet integrated circuit designation standards.

## Key Facts
- Inception: 1982, with reference documentation available at http://www.155la3.ru/k490.htm
- Country of origin: Soviet Union
- Instance of: Model series and integrated circuit series
- Subclass of: Integrated circuits and seven-segment displays
- Has parts: Seven-segment display and decoder
- Complies with: Soviet integrated circuit designation system
- Commons category: 490 series integrated circuits
- Described at URL: http://www.155la3.ru/k490.htm (in Russian)
- Wikimedia sitelink count: 1

## FAQs
### Q: What are the 490 series integrated circuits used for?
A: The 490 series integrated circuits are used as seven-segment LED displays with built-in decoder chips for displaying decimal numerals in electronic devices.

### Q: When were the 490 series integrated circuits developed?
A: The 490 series integrated circuits were developed in 1982 in the Soviet Union.

### Q: What makes the 490 series unique compared to other display circuits?
A: The 490 series uniquely combines seven-segment LED displays with built-in decoder chips in a single integrated circuit package, following Soviet designation standards.

## Why It Matters
The 490 series integrated circuits represent an important development in Soviet-era electronics, combining display and decoding functions into a single integrated package. This integration simplified circuit design and manufacturing for devices requiring numeric displays, such as calculators, digital clocks, and measurement instruments. By incorporating both the LED display and the decoder logic on one chip, these circuits reduced component count, board space, and assembly complexity. The series exemplifies the Soviet approach to creating standardized, cost-effective electronic components for domestic and potentially export markets, contributing to the broader ecosystem of Soviet integrated circuits and electronic devices.

## Notable For
- First Soviet integrated circuit series to combine seven-segment LED displays with built-in decoder functionality
- Standardized Soviet designation system compliance for easy integration into existing designs
- Reduced component count and simplified manufacturing for electronic devices requiring numeric displays
- Documentation and specifications available in Russian for Soviet engineering community
- Part of the broader Soviet integrated circuit ecosystem from the early 1980s

## Body
### Technical Specifications
The 490 series integrated circuits feature seven-segment LED displays with integrated decoder chips, allowing direct numerical input without requiring external decoding circuitry. These devices were manufactured according to Soviet integrated circuit standards and specifications.

### Design and Architecture
Each 490 series IC combines the LED display elements with the necessary logic for converting binary-coded decimal (BCD) or other input formats into the appropriate segment activation patterns. This integration represents a significant advancement in display technology by eliminating the need for separate decoder chips.

### Applications
These integrated circuits were primarily used in devices requiring numeric displays, including:
- Calculators and adding machines
- Digital clocks and timers
- Measurement and testing equipment
- Industrial control panels
- Consumer electronics with numeric readouts

### Historical Context
Developed in 1982 during the Soviet era, the 490 series reflects the state of integrated circuit technology available in the USSR at that time. The series was part of the broader Soviet effort to create domestic alternatives to Western integrated circuits, supporting the country's electronics industry and reducing dependence on foreign components.

### Documentation and Support
Technical documentation for the 490 series is available in Russian at http://www.155la3.ru/k490.htm, providing specifications, pinouts, and application information for engineers and technicians working with these components.

## References

1. [Source](http://www.155la3.ru/k490.htm)