gabz Posted March 23, 2006 Report Posted March 23, 2006 Hello, I tested my DIN module some weeks ago and it worked with 74LS165, thought some times it had problems but it had well worked a long time ...then yesterday I had to use it, replugged it ... and nothing workedCan It be the 74LS165 that don't fit ? (normally its 74HCT165, I think that the logical voltages aren't the same)thanks
TK. Posted March 24, 2006 Report Posted March 24, 2006 yes, no idea...the 74LS165 should be ok, but I could also be wrong.With the srio_interconnection_test you could at least ensure, that the connections to the module are okBest Regards, Thorsten.
moebius Posted March 24, 2006 Report Posted March 24, 2006 no idea, what the problem might be.. :-\I THINK 74LS165s should work - PIC I/O is both CMOS/TTL compatible.. so maybe some other issues? (Connections ect.)Moebius
Tanstaafl Posted March 25, 2006 Report Posted March 25, 2006 I had these same type problems when selecting '165s. I found some 'LS165's that would work and some that would not. I'm thinking the ones that worked were from hitachi or toshiba... I finally gave up and went exclusively with 'HCs no matter the manufacturer, they all seem to function correctly.Of course, if possible, populate the boards with chips from the same company.I have standardized on some that I can get locally.... CD74HC165E 's from RCA.good luckgb
TK. Posted March 25, 2006 Report Posted March 25, 2006 Could somebody please send me a non-working 74LS165 for evaluation?Best Regards, Thorsten.
Tanstaafl Posted March 25, 2006 Report Posted March 25, 2006 uhhh.... i will happily sent you one... but I would think the shipping to Deutschland is about 100 times the cost of the chip. maybe the spec should be changed to reflect the 'HC' version for klein bisschen mehr geld. I can get the LS and HC versions in the US for the same price.... approx. 45pfennig.sorry if this dilutes the discussiongb
gabz Posted March 25, 2006 Author Report Posted March 25, 2006 Ok thanks for the informationsMines are Motorola I think (little M inside a circle?) I should test with HC, but i think my problem is a short on the board , I don't see what it can be otherwise because it worked the first time ...Thorsten, If it's really the fault of the LS chips (when i'll test with HC) I'll send you someThanks
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