My ancient "Designing with TTL" (1971!) recommends tieing unused
inputs to used inputs...I seem to recall that the best termination is
tied to Vcc.
John :-#)#
At 6:10 PM -0600 9/6/06, Jess Askey wrote:
>can anyone explain what any pro's or con's there might be on tying
>static input pins on a TTL device 'high' through a pull-up resistor
>vs straight to the +5V supply? Im working on laying out a ASIC
>replacement PCB and I had the board designed with pull-up resistors
>but tracing them is becoming a PITA so I thought about just tying
>them to the +5V rail as an alternative.
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Received on Wed Sep 6 20:52:38 2006
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