Re: GAL running hot

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Fri, 20 Apr 2018 18:41:37 +0200 Message-ID: <de68006f-7fd9-674f-d392-5aa7f876ac96@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 04/20/2018 05:56 PM, silverdr@wfmh.org.pl wrote:
> 
>> On 2018-04-20, at 14:52, Francesco Messineo <francesco.messineo@gmail.com> wrote:
>>
>>> Unfortunately not /that/ GAL.. anyway - I made a small circuit (the first successful one in KiCAD I wrote about not long ago) for the 64 that employs the small 16V8 GAL chip. All works fine but the (Lattice) chip runs surprisingly hot. Does anyone have any experience with GALs and with what can affect their power consumption?
>>
>> In my experience, old PALs and GALs run hot,
> 
> The datasheet says it should take in the range of 70mA, which makes it less than half W. Yeah, much more than an LS chip but OTOH not /that/ much..

Yes, but half a watt in such a small case gets quite hot. A 6569 VIC in 
a C64 uses about 1.5W (200mA/5V and about 40mA/12V) and gets pretty hot 
(above 60C on the surface without heatsink).

  Gerrit