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As you don't mention exactly what it's for, it's impossible to say.
But a single 16F877 can easily multiplex a 10x10 keyboard array giving 100 inputs.
You can certainly connect 4 micro-controllers together if you wanted, that's no problem at all.
the 100 input coming from sensors so i need to input them to the micro
it is the usage So could it easily multiplexing or may i use MUX or Decoder ?
But if it's analogue look at CMOS switches, if it's digital, then decoder IC's.
Without knowing what the sensors output people can only guess. Tell us what you are doing and what the sensor output are ?the 100 input coming from sensors so i need to input them to the micro
it is the usage So could it easily multiplexing or may i use MUX or Decoder ?