For what it's worth, Fairchild has a 74LCX line as well if everyone's looking for keywords to search for. I've used a 74lcx245 to build a parallel-port JTAG adapter some time ago. http://jbevren.net/pixter/debugstation.jpg, seen on the prototyping board in the upper right. They're incredibly handy and I recommend tinkers always have some on hand in case they run into some 3.3v logic they need. Also, don't fear SMT. I did for ages but found that it's really not too difficult once the process of soldering it is practiced a few times: http://jbevren.net/pic/8kinside/1--smt-parts.jpg was drag-soldered, and is one of the first SMT solder jobs I'd done. -David On Thu, Apr 19, 2018 at 7:06 PM, Jim Brain <brain@jbrain.com> wrote: > On 4/19/2018 3:48 PM, Mia Magnusson wrote: > >> Den Tue, 17 Apr 2018 12:22:41 +0200 skrev Michał Pleban >> <lists@michau.name>: >> >> Nice! >> >> Btw I've noticed that availability and price of those old-style sram's >> have varied quite a bit during the last years. >> >> When you already have buffers for all adress lines and most control >> lines, maybe it would be a good idea to add something for the rest of >> the lines, and choose all components so it would be possible to fit a >> 3.3V SRAM (assuming a 3.3V regulator somewhere). >> >> Or maybe this isn't any good idea :) >> >> I think it's a fine idea, and one I use a lot. However, most newer SRAM > is SMT, 3V3 or not. If you're going to move to SMT, I would recommend > putting all the logic to a CPLD (Xilinx XC95000xl series are 3v3 units with > 5V tolerance when powered). > > But, if one wants to stay through hole, I think it is still possible (I > think you cna buy LVX/LVC TTL in DIP form that are 5V tolerant > >Received on 2018-04-20 15:00:02
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