| Attachment | Size |
|---|---|
 am27c256.pdf | 166.08 KB |
So I am getting into hardware dev and I am a total noob. I am trying to get some sockets for a prototype (so as not to keep soldering\desoldering) but I don't know what to make of the dimensions on the datasheet.
I am working with a couple AM27C256 EPROMs which come in a 14x2 28pin DIP configuration. I'm just trying to discern which measurements represent row spacing and pitch - as those seem to be the most relevant when selecting a socket.
Again - I've never looked at anything like this before - I could just measure it but I am away from my tools at the moment and I'd rather learn how to read this anyway.
Bottom of page 11 of the attached PDF.
Thanks!
Hello bushnvrn,
first of all it might be usefull to unterstand that the two measurement specified
are minimum and maximum measurements ( top minimum bottom maximum )
a ( ungiven medium value ) is the normal value....
spacing 0,1 inch is regular spacing
i dont know what you mean with pitch.... sorry...
distance between row with pins 1 to 14 and row with pins 15 to 28 is 0,65 inches.
At the other hand... if you just need the dimensions for the selection of the sockets....
that sockets are standard !
So the only 2 things to know if you want to order the sockets is:
pinamount and package-type.
pinamount is: 28 pins
and package type is:
Dual In Line package ( often shortened by the abreviation DIL or DIL-28 ).
At other chips you may also pay attention because there are 2 kinds of DIL packages ...
narrow and wide..... and in this case we are talking about wide ....
sincerely
speedyG
I take this to mean the distance between pins = pitch.
I was going off this assumption but the Digikey search filters provided an overwhelming amount of information and options outside of this:
Digikey Sockets
Just for my own understanding - is this the same as DIP?
Thanks!
DIP and DIL are normally same.
There are 2 measurements important:
distance from pin to pin within same row: 0,1 inch
and distance between 2 rows on opposite side of chip: 0,6 inch at "wide" cases.
Narrow or "normal" cases ( like at normal standard TTL chips i.e. 74LS10 )
at DIL or DIP have distance of 0,3 inches between the pin rows.
At the given link to Digikey for example:
the first 6 sockets have normal spacing between pinrows
while the 7th socket is "wide" type with double distance between pinrows.
( column 14 )
speedyG
Thanks. I ordered a tube of 10.