# Texas Instruments SN76477

> sound generating integrated circuit

**Wikidata**: [Q221916](https://www.wikidata.org/wiki/Q221916)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Texas_Instruments_SN76477)  
**Source**: https://4ort.xyz/entity/texas-instruments-sn76477

## Summary
The Texas Instruments SN76477 is a sound-generating integrated circuit (an integrated-circuit model) developed by Texas Instruments and introduced in 1978. It is classified as a programmable sound generator — a sound chip that produces audio signals from basic waveforms — and is documented under the Wikipedia title "Texas Instruments SN76477."

## Key Facts
- The SN76477 was developed by Texas Instruments and has an inception year of 1978.  
- The device is an integrated circuit model that is subclassed as a programmable sound generator (a sound chip that generates audio signals built from one or more basic waveforms).  
- Common aliases for the device are SN76477N and SN76477NF.  
- The SN76477 is described on Wikidata as a "sound generating integrated circuit."  
- The device has schematic and top-view images available: https://commons.wikimedia.org/wiki/Special:FilePath/76477_Demo_Circuit-D.JPG, https://commons.wikimedia.org/wiki/Special:FilePath/76477_Demo_Circuit-D.png, https://commons.wikimedia.org/wiki/Special:FilePath/SN76477_TOP_VIEW.png.  
- Reference image file: https://commons.wikimedia.org/wiki/Special:FilePath/Sn76477.jpg and Commons category "SN76477."  
- Related/associated items include the General Instrument AY-3-8910 (listed under Part of/Parent classes) and the Texas Instruments SN76488 (a related sound chip with audio amplifier).  
- Identifier: Freebase ID /m/04csjfb (reference metadata available).  
- The entity has a Wikipedia entry titled "Texas Instruments SN76477" and appears across multiple language resources (commons, de, en, it, ru).  
- Sitelink count recorded as 5 on the provided data.

## FAQs
### Q: What is the Texas Instruments SN76477?
A: The SN76477 is a sound-generating integrated circuit developed by Texas Instruments, classified as a programmable sound generator that produces audio signals from basic waveforms.

### Q: When was the SN76477 introduced?
A: The SN76477's inception is listed as 1978.

### Q: Who manufactured the SN76477?
A: The developer/manufacturer is Texas Instruments.

### Q: Are there documented schematics or images for the SN76477?
A: Yes. Demo circuit schematics and a top-view image are available at the Commons URLs: 76477_Demo_Circuit-D.JPG, 76477_Demo_Circuit-D.png, and SN76477_TOP_VIEW.png, and a device image at Sn76477.jpg.

### Q: Is the SN76477 related to other sound chips?
A: Yes. It is associated with the programmable sound generator class and is listed alongside devices such as the General Instrument AY-3-8910 and the Texas Instruments SN76488 (a related sound chip with an audio amplifier).

## Why It Matters
The SN76477 represents a specific integrated-circuit implementation of sound generation and is formally classified as a programmable sound generator. As a dedicated sound-generating IC developed by Texas Instruments and introduced in 1978, it embodies the modular approach to producing audio signals within electronic systems by providing an on-chip solution for waveform-based sound synthesis. Documentation and imagery for the SN76477 are available, enabling study, reference, or restoration work. Its classification and links to related chips (for example, the SN76488 which includes an audio amplifier) position it within a family of discrete sound ICs that designers and hobbyists reference when selecting components for electronic audio functions. The device’s recorded identifiers, aliases, and archival schematics make it a traceable example of late-1970s sound-IC engineering and aid in identification and comparison with other programmable sound generators.

## Notable For
- Developed by Texas Instruments and introduced in 1978, giving it a clearly recorded inception date.  
- Classified as an integrated circuit model and specifically as a programmable sound generator.  
- Known aliases SN76477N and SN76477NF, useful for identifying different package variants or references.  
- Publicly documented schematics and top-view images available on Wikimedia Commons.  
- Explicitly connected in the data to related devices such as the SN76488 (sound chip with audio amplifier) and to the broader programmable sound generator class.

## Body
### Overview
- Name: Texas Instruments SN76477.  
- Description: Sound generating integrated circuit (Wikidata description).  
- Wikipedia title: "Texas Instruments SN76477."  
- Commons category: SN76477.

### Classification and relationships
- Instance of: integrated circuit model.  
- Subclass of: programmable sound generator (sound chip that generates audio signals built from one or more basic waveforms).  
- Part of / Parent classes listed: General Instrument AY-3-8910 (class) and programmable sound generator (class).  
- Related chip: Texas Instruments SN76488 — described as a sound chip with an audio amplifier.

### Development and identifiers
- Developer: Texas Instruments.  
- Inception (year): 1978.  
- Aliases: SN76477N, SN76477NF.  
- Freebase ID: /m/04csjfb (reference metadata available).

### Documentation and imagery
- Device image: https://commons.wikimedia.org/wiki/Special:FilePath/Sn76477.jpg.  
- Schematic/demo circuit images:  
  - https://commons.wikimedia.org/wiki/Special:FilePath/76477_Demo_Circuit-D.JPG  
  - https://commons.wikimedia.org/wiki/Special:FilePath/76477_Demo_Circuit-D.png  
  - https://commons.wikimedia.org/wiki/Special:FilePath/SN76477_TOP_VIEW.png

### Metadata and links
- Sitelink count (from provided data): 5.  
- Available Wikipedia/Wikimedia language resources: commons, de, en, it, ru.  
- Wikidata description: "sound generating integrated circuit."

## References

1. Freebase Data Dumps. 2013