Buffer HELP!

How the blasphemy do you use SN74HC541??? What are A1, Y1, OE1 and OE2?

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Permalink Reply by Francis Cedric Cruz on April 30, 2014 at 2:15pm

A1 is the inputs to the buffer (assuming you are using this to protect your PIC) it will be the signal from your PIC. Y1 is the output signal going to whatever e.g. motor driver. ~OE1 and ~OE2 are output enable pins. ~OE1 and ~OE2 are connected to a NAND gate which its output is connected to all 8 buffers in the chip. These pins allow you to control whether there is any output in the Y pins. So to enable the buffers you just need the ~OE1 and ~OE2 pins to be low and to disable the buffers you need to send a high signal to them. There is no need occupying an extra pin on the PIC just to enable/disable the buffer so you can just the ~OE pins to the ground with a resistor. If you don't add that pull-down resistor your buffer can enable and disable randomly