Hi I'm looking for a specific logic chip but I can't find it anywhere. I need it to take a 4-bit input and select one of 16 or however many outputs depending on the input. Ie, IN: 1001 output 9 pulled high IN: 0010 output 2 pulled high Does this exist? I'm sure it does but I think I'm just looking for the wrong name. Thanks Colin C
They are called BCD to Decimal decoders. Try googling to find one that's available/ affordable. An example of such a chip would be the HCC4028/ HCF4028; another would be the 74HC42. These have 4 inputs (BCD) and select 1 of 10 output pins based on the binary code presented. edit: I forgot to state that the inputs are parallel. ie. you present the BCD over 4 pins. It's not serial logic where you send the code via a series of pulses over a single wire.
Also look at 4514B, 4-Bit Latch/4-to-16 Line Decoder with Output Hi. I have one waiting to be a 16-LED Knight Rider. 1-of-8 line decoder chips (eg, 74HC138 or 74HCT138) can be chained as in Bill Bowden's KR.
