IC's info look up

[Motorcoach1]

electronic parts look up. I have an assortment of IC's and haveing trouble finding specs on these. All I can find is cataloge sheets of lists. can anyone direct me to where I can get Pdf fies on the IC's. Thanks in advance Mike. heres some parts I'm looking up-- AM9582ADC LH2252-35 sharp PAL1618DCN MC6868ID 14ptiq88356 pal22v10-15pc MC68020RC25E1b47K8833 MK48TIZB-25 these are in scokets and mounted on boards and have no been removed YET lol. I have a lot more other parts too (IC's ) some rare chips.

[rdpzycho]

where are they from? is AM9582ADC the ones found in disk drives, tape drives?

some IC manufacturers only give the datasheets of some specific ICs to OEMs...some are also proprietary or the predecessors of ASICs which the manufacturer did for only a small quantity..I also have a lot of rare ICs that I cannot get datasheets of..most of them are from the Telephone Company's Cards (SLIC, etc)

[CountZero]

www.google.com works for many ic's

www.alldatasheet.com

www.datasheetarchive.com

[vger]

Ahh the search for datasheets. I still have a copys of the 1977 and 1984 "IC Master". In 1977 it was one 3" thick volume and in 1984 it was two 3" thick volumes. It has small entries for most ICs available at that time identifying pin functions only. Many manufacturers custom design parts that are totally proprietary. Others order stock parts with custom numbers on them. Sometimes a custom numbered part will have the stock number on the bottom!

Of the parts you listed:

PAL1618DCN is a Programable Array Logic device that most likely has already been programmed (one time only fuseable links) and will be usefull only in it's original circuit.

The MCxxxxxx numbered are motorola chips, MC68xx are from the motorola 6800 microprocessor family (radio shack TRS80 used em) of which I seem to remember a MC6821 is a PIO and a MC6822 is an SIO, or maybe vice versa (too many years ago)

The LH2252 is from National Semiconductor I think. Most likely an analog chip.

Many older computer chips (especially memory) used the -xx numbers denoting the switching speed of the chip. -25 for examble meant it had a 250 nanosecond propgation delay from input to stable output.

some prefixes here:
uPD NEC corp
HD Hitachi
TC Toshiba
TCM Texas Instruments (telecomunications circuits)
HDG Analog devices
MC Motorola (computer products)

and then there is the all encompasing

SN which means "Signetics Number"

Signetics was one of the first manufacturers of ICs and when onters (like texas instruments) started producing ICs they numbered them after the original Signetics part as in... SN7400 (a quad nand gate)

Back in the early 90's NASA put out a request for ANYONE haveing ceramic packaged 8080 microprocessors. Seems they were no longer manufactured and one of the electonics pagkages on the space shuttle needed some spares.

Good Hunting

Steve

[rdpzycho]

Originally Posted by vger Others order stock parts with custom numbers on them. Sometimes a custom numbered part will have the stock number on the bottom!

I always hate it when I have to repair a certain product with the IC numbers having custom numbers sticking in them. I think it was common practice to somewhat keep your circuits protected from reverse engineering (on my former job, the production supervisor orders the personnel to sand off the numbers on the IC).

some IC also have the number inserted in between their own codes. I see a lot of them in PC Power Supplies where the common TL494 has a different number but still sticks the 494 somewhere in there.