On Tuesday 13 September 2005 10:29 pm, Stuart Brorson wrote: > > [snip] > > > > >Sorting chips by function (opamp, regulators, microcontrollers..) should > > > be better since manufacturers of some chips change but the names are > > > preserved. For example old uA723 is now made by Texas and not by > > > Fairchild who introduced the prefix uA (originally "micro"A) in 1970's. > > > Some popular chips can have many manufacturers, so it will make the > > > problem where to put them. > > > > Hmmm. An interesting idea. Currently, there are directories > > (like micro or tube) which are exactly this. Does this really scale? > > What do others think of this? > > Designing an optimal parts library is more difficult than one > might think at first blush. On one hand, there are lots of parts > which aren't associated with any one particular manufacturer, such as > passives, common diodes (1N4148), transistors (2N2222) or (showing my > age) many common vacuum tubes. On the other hand, it's logical to > organize other parts by manufacturer. Examples which spring to mind > are MicroChip PICs, Intel microprocessors, or speciality parts such as > the MAX232. Stuart is right on target in my opinion. Further, this problem seems to know no bounds (Except with most FPGA's). For example, Glue logic chips like ttl/cmos, ecl, bus drivers and low voltage chips are a problem. Taking only the LV (Low voltage) family: 74ALB Advanced - Low Voltage - BiCMOS 74LV (U) Low Voltage (Unbuffered output) (CMOS) 74LVC (R) (U) LV - CMOS (damping Resistor)(Unbuffered output) 74LVCH Low - Voltage - CMOS - bus Hold 74ALVC Advanced - Low - Voltage - CMOS 74LVT (R) (U) LV - TTL (damping Resistor(Unbuffered output) (BiCMOS) 74LVTZ Low - Voltage - TTL - High Impedance power-up 74ALVC (R) ALV - CMOS (bus Hold) (damping Resistor) 74ALVCH Advanced - Low - Voltage - CMOS - bus Hold 74LCX LV - CMOS (operates with 3v and 5v supplies) 74VCX LV - CMOS (operates with 1.8v and 3.6v supplies 74CBTLV CBT - Low Voltage Now, add part numbers to the above list. Part numbers that are shared by just about *all* of the manufacturers of chips in the LV family. Also, I'm not going to waste bandwidth naming the different manufacturers just in the LV series of logic - Lets just say the number of manufacturers is *mind boggling*. Regards Marvin
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