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Max 7219 Driver socket — Parallax Forums

Max 7219 Driver socket

kenstuppykenstuppy Posts: 5
edited 2013-02-18 09:18 in BASIC Stamp
Hey guys,
I ordered a Max 7219 in a 24 pin Dip package, hoping to use a 4 seg LED with my basic stamp, and when I received the chip, I was surprised to find the pin configuration narrower than any other IC I have ever used. I ordered a couple 24 pin Narrow Plastic Dip sockets, and none of these fit the chip. Any suggestions to where I can order sockets to fit the maxim chip?

Comments

  • PublisonPublison Posts: 12,366
    edited 2012-01-09 08:58
    kenstuppy wrote: »
    Hey guys,
    I ordered a Max 7219 in a 24 pin Dip package, hoping to use a 4 seg LED with my basic stamp, and when I received the chip, I was surprised to find the pin configuration narrower than any other IC I have ever used. I ordered a couple 24 pin Narrow Plastic Dip sockets, and none of these fit the chip. Any suggestions to where I can order sockets to fit the maxim chip?

    It should be a standard 0.3" wide socket such as this:

    http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_39387_-1

    I    've been burned before ordering 24 pin sockets, as they normally default to the .6" width.

    I have stacked two standard 14 pin socket to make a 28 pin socket in a pinch.
  • Mike2545Mike2545 Posts: 433
    edited 2012-01-09 09:01
    How far are the pins from ths socket holes? I have found that most ic pins need tweeked to fit in the sockets.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2012-01-09 09:05
    The socket should be 0.3" W with 0.1" pin spacing.
  • kenstuppykenstuppy Posts: 5
    edited 2012-01-11 07:38
    Hey, Thanks, looks like spec sheet same as dip sockets already ordered, 8mm(.3") between rows, 24 pin approx 30mm long. The Max 7219CNG is a dip, 24 pin, 8mm between rows, however, the length is only about 22 mm. They pack 24 pins into a standard 18 pin dip footprint. It will not fit on a standard breadboard, so I'll probaby have to mount to perf board, and jerry rig an adapter to fit std 24 pin dip. If I knew whart to order, I would be ok. If I had concrete plans, I would just design a pcb, however, I am in the learning stages, just playing around with this stuff. Any direction would be appreciated.

    Thanks,
    Ken
  • PublisonPublison Posts: 12,366
    edited 2012-01-11 07:56
    kenstuppy wrote: »
    Hey, Thanks, looks like spec sheet same as dip sockets already ordered, 8mm(.3") between rows, 24 pin approx 30mm long. The Max 7219CNG is a dip, 24 pin, 8mm between rows, however, the length is only about 22 mm. They pack 24 pins into a standard 18 pin dip footprint. It will not fit on a standard breadboard, so I'll probaby have to mount to perf board, and jerry rig an adapter to fit std 24 pin dip. If I knew whart to order, I would be ok. If I had concrete plans, I would just design a pcb, however, I am in the learning stages, just playing around with this stuff. Any direction would be appreciated.

    Thanks,
    Ken

    The MAX7219 is a standard 24 pin plastic DIP chip. 0.100" spacing between pins and 0.300 width spacing. Standard stuff. I've stuffed many of these in standard 0.300" , (also called narrow 24 DIP), sockets. You will be OK with the sockets you ordered. Trust me. :)
  • RDL2004RDL2004 Posts: 2,554
    edited 2012-01-11 08:16
    I can confirm the size. I have two MAX7219CNG chips in my parts cabinet. I just measured one and it's 31.72 mm long, the pin spacing is the standard 0.1". Here is a snip from the Maxim datasheet:

    Maxim_0.3_package.gif


    My chip is in spec :)
    Maxim_0.3_package.gif
    631 x 731 - 58K
  • kenstuppykenstuppy Posts: 5
    edited 2012-01-12 05:07
    I must be missing something. I photograghed the max 7219 chip this am, posted on flickr http://www.flickr.com/photos/18227653@N06/. Maybe it is a non standard chip, I have the 24 pin dip compared to a 18 pin dip LM3914, showing same size. Got from china, can anyone advise me on a method to mount and use this chip?
  • RDL2004RDL2004 Posts: 2,554
    edited 2012-01-12 06:06
    It looks like you may have a very unusual variation called an SPDIP (shrink PDIP), which is like a regular 0.30" wide DIP except the pins are on a 0.07" pitch instead of 0.10" (1.778 mm vs 2.54 mm). Can you measure the exact pin spacing to confirm this?

    I didn't see this size listed officially at the Maxim web site, so the chip you have may or may not be genuine.



    Here is a link to a Mill-Max SPDIP sockets datasheet:

    http://www.mill-max.com/images/products/pdf/057N.pdf
  • kenstuppykenstuppy Posts: 5
    edited 2012-01-12 06:33
    rick, you got it! I am only slightly crazy! So much for saving a buck! The spacing of .070" is correct, 12 pins mesure 19mm (calculates at 19.558) .3 width only avail on 16 pin, so I'll have to order the single row, and create adapter to fit std dip socket. I'll let you know if it's genuine once I have parts.
    Thanks again,
    Ken
  • kenstuppykenstuppy Posts: 5
    edited 2012-01-12 06:40
    sent email for order, let you know results
  • PublisonPublison Posts: 12,366
    edited 2012-01-12 10:39
    I not sure Maxim ever made this device in that footprint, according to the datasheet. I hope you didn't get stuck with a counterfeit.

    Do you have a closeup of the chip itself?
  • RDL2004RDL2004 Posts: 2,554
    edited 2012-01-12 11:37
    I did mention that the chip may not be genuine since the unusual packaging isn't listed as being available from Maxim, but I kind of think that It wouldn't make a lot of sense for a counterfeiter to make a knock-off in a non-standard form factor - it immediately raises suspicion. My guess is that it's a leftover from a special made-to-order production run or something of that nature. Hopefully, Ken's chip will turn out to be the real thing.
  • PublisonPublison Posts: 12,366
    edited 2012-01-12 11:49
    RDL2004 wrote: »
    My guess is that it's a leftover from a special made-to-order production run or something of that nature. Hopefully, Ken's chip will turn out to be the real thing.

    Ditto, let's hope it has the same pin-outs.
  • MoskogMoskog Posts: 554
    edited 2013-01-29 04:01
    Hey, did you ever find out if these devices really are max7219 clones or are they packages with nothing inside?
    Asking because I found out I have a lot of them myself, but they will be difficult to use.

    Before I search for adaptors or something I would really like to know if they are fake or real.
  • MoskogMoskog Posts: 554
    edited 2013-01-31 12:33
    OK, no problem, I ordered a new box of 7219's from another Hong Kong seller, hopefully I receive real DIP24 this time and not this useless leftovers mr Piong Yang sent me last time:tongue:

    I attached a picture of the two different 7219's, the normal one to the left, the abnormal one is about one cm shorter.
    max7219.jpg
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  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2013-01-31 12:54
    The chip on the right looks like a knock-off of the original. :innocent:
  • MoskogMoskog Posts: 554
    edited 2013-01-31 13:01
    Chris Savage wrote: »
    The chip on the right looks like a knock-off of the original. :innocent:

    You can have them if you want to, I have 10-15 of them I think.
  • CuriousOneCuriousOne Posts: 931
    edited 2013-02-17 09:59
    Actually, maxim will send you 5 pcs of MAX7219 chip as free sample, at no cost. (Personal experience), and they will arrive in "normal", breadboard compatible package.
  • MoskogMoskog Posts: 554
    edited 2013-02-18 09:18
    CuriousOne wrote: »
    Actually, maxim will send you 5 pcs of MAX7219 chip as free sample, at no cost....

    Don't think I bother, tried the free sample thing once before, then nothing seen and nothing heard.
    Ordered some 20 pcs of them on ebay and they arrived safe and sound, almost free and they all are normal!
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