Z8622912PSG

Overview

The Z8622912PSG is a stand-alone Line 21 decoder manufactured by Zilog, designed for closed-captioning and Extended Data Services (XDS) compliance with EIA-608 specifications. It processes Vertical Blanking Interval data from both video fields to extract captions, text, and XDS packets such as time of day and program blocking information. The device features programmable XDS filtering, an on-screen display generator, and violence blocking capabilities within Picture-in-Picture windows. It communicates via an I2C serial bus supporting two selectable addresses or SPI mode. Operating at a nominal 5V supply (4.75V to 5.25V), it is housed in an 18-pin DIP package.

Feature Summary

• Complete stand-alone processing of Line 21 data channels including captions, text, and extended data services
• Programmable on-screen display generator for full screen or picture-in-picture window integration
• Dual-mode serial control interface supporting I2C with selectable addresses and SPI operation
• Automatic extraction and output of specific XDS packets including time zone and program blocking data

Applications

• Closed captioning systems in television receivers
• Set-top boxes requiring Extended Data Services decoding
• Video monitoring equipment implementing violence blocking in Picture-in-Picture windows
• Auto clock set functionality in consumer electronics

Procurement Notes

Verify the package type matches the required form factor, as the 'PSG' suffix indicates a 18-pin DIP configuration. Confirm that the manufacturing source aligns with system qualification requirements. Ensure the component meets RoHS standards if applicable to the final assembly. Check for availability status as legacy components may have limited production runs. Validate pin compatibility with existing board layouts before procurement.

Selection Notes

Select this component when a dedicated hardware solution for NTSC Line 21 decoding is required without external microcontroller overhead. It is suitable for applications needing direct OSD generation and XDS packet filtering. Consider the 18-pin DIP package constraints for PCB design. Verify that the host processor supports the required I2C or SPI communication protocols for configuration and data retrieval.

Part Context

This part belongs to the Z86229 family of Line 21 decoders produced by Zilog. It serves as a specialized peripheral for handling broadcast data streams in analog video environments. The device integrates video input processing, data slicing, and character generation into a single chip, reducing system complexity compared to software-based decoding solutions.

Replacement Considerations

Check for direct pin-compatible alternatives within the Zilog decoder portfolio. Verify functional equivalence regarding EIA-608 compliance and XDS filter programmability. Ensure voltage levels and serial interface timing match the existing design constraints.