Folks, I'm trying to identify a small 0.4 cm x 0.4 cm 6-pin DIP IC chip that has two rows of part numbers written on it. 493, 328T, and a symbol "o----" (round dot with a solid line above it, like a musical note rotated 90 degrees). Its package is a ceramic base with silver/steel cap and a gold outline. The board has an antenna and a PIC processor, but the part doesnt seem to be directly connected to either of these components based on probing. I did notice 1.5 V input on pin 2 (I think). It's a low power component, and the whole board fits in the palm of your hand. Some have suggested a crystal filter, but I can't find any data sheet that reflects the numbers written on this IC. I've tried googling, but the results weren't useful. These are the basic questions I'd like to pose to this group...
a. Essentially does anyone have rules of thumb they use to help them figure out what an unknown IC is? b. Any ideas what this is based on the part number or symbol? c. Where I ought to look to figure it out? d. What I ought to measure that could help me based on voltages, signals, or currents, or what it is attached to that would help me figure out what its for or what it does? e. Any ideas where else I can look to find the answer?
I've already struck out over at sci.electronics.components, so maybe this group is keener on these types of questions. Thanks, Herbie