Z8622912SSC

Overview

The Z8622912SSC is a stand-alone Line 21 decoder manufactured by Zilog, designed for closed-captioning and Extended Data Services (XDS) in NTSC video systems. It processes Vertical Blanking Interval data from both fields of the video frame to recover nine multiplexed data channels. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0°C to +70°C. It features programmable XDS filters, automatic extraction of time zone and program blocking packets, and I2C serial communication with two selectable addresses.

Feature Summary

• Automatic extraction and serial output of special XDS packets including Time of Day, Local Time Zone, and Program Blocking
• Programmable on-screen display (OSD) capability for full screen or Picture-in-Picture windows
• Supports two selectable I2C addresses for flexible system integration
• Compliance with EIA-608 specifications for extended data services

Applications

• Closed-caption decoding for television receivers
• Extended Data Services (XDS) processing in set-top boxes
• NTSC violence blocking inside Picture-in-Picture (PiP) windows
• Auto clock set functionality for consumer electronics

Procurement Notes

Verify the specific suffix '12' against official documentation to confirm pinout and package configuration. Ensure the selected variant matches the required I2C address selection logic and physical footprint for the target PCB design. Cross-reference the manufacturer's latest datasheet to confirm availability status and any potential product change notifications affecting this specific part number.

Selection Notes

Select this component when a dedicated hardware solution for Line 21 decoding is required without host processor overhead. Ensure the input video signal meets the specified 1.0V p-p amplitude and 600 kHz bandwidth requirements. Verify that the system can provide the necessary horizontal sync (HIN) signal for proper VCO locking and display timing generation.

Part Context

This component belongs to the Z86229 family of Line 21 decoders produced by Zilog. It is specifically engineered to handle the complex timing and data recovery tasks associated with NTSC vertical blanking interval signals. The device integrates video slicing, clock recovery, and character generation logic into a single monolithic circuit.

Replacement Considerations

Consult the manufacturer's obsolescence notices for direct replacements. Generic logic ICs cannot substitute this function due to the proprietary Line 21 decoding algorithms and specific timing requirements inherent to the Z86229 architecture.

FAQ

How does the Z86229 handle I2C addressing?

The device supports two selectable I2C addresses determined by the state of the I2C SEL pin. A Low state selects addresses 28h/29h, while a High state selects 2Ah/2Bh.

What is the purpose of the HIN pin?

The HIN pin provides the horizontal sync input signal required to bring the internal VCO close to the operating frequency, enabling phase locking for accurate display timing.

Can the Z86229 operate without a composite video input?

Yes, in INTRO mode, the device can generate an OSD display using internal vertical synchronization, utilizing the VIN/INTRO pin as an interrupt output rather than a video input.