Derated PIC16F688 for 2009

[jrock64]

Prior to 2009 all the data sheets for the PIC16F688 were for 25ma per pin 200ma total for the chip.

Maximum current out of VSS pin ................................ 300 mA
Maximum current into VDD pin ................................... 250 mA
Maximum output current sunk by any I/O pin................... 25 mA
Maximum output current sourced by any I/O pin .............. 25 mA
Maximum current sunk by PORTA and PORTC (combined) ...200 mA
Maximum current sourced PORTA and PORTC (combined) ...200 mA

Suddenly for 2009 the total for the chip is only 90ma

Maximum current out of VSS pin ................................... 95 mA
Maximum current into VDD pin ...................................... 95 mA
Maximum output current sunk by any I/O pin.................... 25 mA
Maximum output current sourced by any I/O pin ............... 25 mA
Maximum current sunk by PORTA and PORTC (combined) .... 90 mA
Maximum current sourced PORTA and PORTC (combined) .... 90 mA

Did they actually change this chip after all these years?
Or due to some failure reports after all these years did they decide to play it safe and severely derate the same chip they have produced all these years?

I have some plans to direct drive some LEDs off the PIC at 15ma.
Unless someone can tell me they physically changed the chip, my plan is to go ahead.

Joel

[IdunBenhad]

Hi:
Sometimes different packages for the chip have different current ratings. It has to do with how much power the package can safely dissipate.

Be sure you are looking at the data sheet for the package you are using.

To my knowledge, no one has posted anything on this de-rating and they are continuing to use the DIP package in their new designs.

[ErnieHorning]

I believe this changed somewhere around 2006 and 2007. Look at the bottom center of any page. The datasheets that specify 200mA also show ‘Preliminary’.

I guess it took them a couple years before someone took the time to actually check.:rolleyes:

[jrock64]

Was discovered and discussed here first
http://doityourselfchristmas.com/forums/showthread.php?t=6785&highlight=90ma

guess that covers it.

joel

[ErnieHorning]

Hmmm… I wonder if Ron ever used the Icicles he was working on in that thread?