Cross Point Switch Circuit - Panasonic KX-TES824LA Service Manual

11.3. CROSS POINT SWITCH CIRCUIT

11.3.1. Composition
The cross point circuit composed of three cross point switch IC´s (IC600 and 601:8X16, IC602:4X8).
*In case of KX-TEM824, the system add more cross point switch IC´s (IC500:8X16, IC501:8X8, IC502:4X8) which are in KX-
TE82483.
1) Cross Point Switch IC Operation
The cross point SW (IC600, IC601) contains a 8X16 array of cross point switches along with a 7 to 128 line decoder and latch
circuits. Any one of the 128 switches can be addressed by selecting appropriate seven address bits. The selected switch can
be turned on or off by applying either logical one or zero to the DATA input. Chip select allows the cross point array to be
cascaded for matrix expansion. Start a new line at this point SW´s (IC602) contain 4X8 array of cross point switches along with
a 5 to 32 line decoder and latch circuits.
Any one of the 32 switches can be addressed by selecting appropriate five address bits. The selected switch can be turned on
or off by applying either logical one or zero to the DATE input. Chip select allows the cross point array to be cascaded for matrix
expansion.
27
KX-TES824LA / KX-TEM824LA /