DESCRIPTION
The Integrated VIP and Teletext (IVT1.1) is a teletext decoder (contained within a single-chip package) for decoding 625-line based World System Teletext transmissions. The teletext decoder hardware is based on a reduced function version of the device SAA5246 (IVT1.0).

FEATURES
• Complete teletext decoder including page memory in a single 40-pin DIL package
• Single +5 V power supply
• Digital data slicer and display clock phase-locked loop reduces peripheral components to a minimum
• Both video and scan related synchronization modes are supported
• On board single page memory including extension packets for FASTEXT
• Single page acquisition system
• RGB interface to standard colour decoder ICs, push-pull output drive
• Data capture performance similar to SAA5231 (VIP2)
• Simple software control via I2C-bus
• Option for five national languages
• 32 supplementary characters for on-screen displays
• Optional storage of packet 24 in the display memory
• Page links in packets 27 and 8/30 are Hamming decoded
• Separate text and video signal quality detectors, 625/525 video status and language version all readable via I2C-bus
• Automatic ODD/EVEN output control with manual override
• Control of display PLL free-run and rolling header via I2C-bus
• VCS to SCS mode for stable 525 line status display