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LM139: LM139

Part Number: LM139

hi,

What should I do with the unused input pins for the LM139? 

I read through the datasheet and it doesn't mention what to do with any unused pins.  A datasheet for a similar part said to tie all unused input pins to the negative supply (in my case this is ground) so is this what I should do with the LM139?  Tie all unused input pins to ground?  And if so can I tie them directly to ground or is a pull-down resistor necessary? 

Regards,

Eric