Overview
The LA7156 is a switching IC for use with the PAL and SECAM 21-pin connector interface. The LA7156 integrates video and audio switches in a single chip, and allows significant block reorganization and integration by providing function switching outputs with current limiters, 75 Ω video drivers, muting and other functions. The LA7156 provides a diverse set of functions, including support for single-wire serial bus control that allows complex logic to be handled by microprocessor software.
   
Functions and Features
• Three audio and three video switching systems
• Audio output and video decoder output muting function
• Video input sync chip clamp
• Two 6 dB video amplifier plus 75 Ω driver systems
• VPS decoder output
• FSS output with current limiting
• 5 V regulator built-in
• Serial control