I am putting together a pcb for an octal inverter (MM74HC240) to replace a hex inverter circuit in a system. The hex inverter IC simply has 6-inputs, 6-outputs, a 5V and a ground. The octal inverter has the 8 normal inputs and outputs and the supply but there are two other pins that connect to the inputs/outputs. What do these do?

Thanks in advance,
MM

 

Hello,

These extra pins are enable pins.
With these pins you can make the outputs high-Z.
See extract from datasheet.

Greetings,
Bertus

 

I am putting together a pcb for an octal inverter (MM74HC240) to replace a hex inverter circuit in a system. The hex inverter IC simply has 6-inputs, 6-outputs, a 5V and a ground. The octal inverter has the 8 normal inputs and outputs and the supply but there are two other pins that connect to the inputs/outputs. What do these do?

Thanks in advance,
MM

Before you use a component you should read its datasheet carefully before use it. The datasheet contains information about the pin configuration, the electrical ratings of the component as not to burn it out etc.

 

Many thanks!