programmable logic devices

[kubeek]

I am looking for some programable logic, something pretty small - i guess no more than 20 flip flops and just a few i/o, running at <1MHz. The key is that it needs to be very low power, so no more than 1mA when running, preferably <0.5mA.

I found ATF16LV8C from atmel, but now that I read the datasheet again it seems to be very power hungry, so do you guys have any recommendations for something that might actually work for me?

 

[ronsimpson]

Most PLD pull power basted on clock frequency. If the clock is slow the power is less.
The 16LV8 only has 8 flip flops.

Also see: GAL26CV12, GALV8 from Lattice

 

[circuitspecialists]

Have you considered using a low power microcontroller? Depending on your application this may be a better route.

 

[kubeek]

Have you considered using a low power microcontroller? Depending on your application this may be a better route.

I have, I am using MSP430 as a main controller, but what I wanted was a hardware decoder for the modified muller encoding used in rfid cards, but the 8mhz was not enough for the decoding scheme I wanted to do, leaving just 12 clocks between samples. Now that I have a better understanding of the encoding I think I should be able to do the logic using just the micro.

But anyway this detour sure showed me how big is the gap between discrete logic chips and programmable logic.

 

[Mikebits]

Less than 1 ma? My goodness. Good luck with that. Why the strict requirement?

 

[kubeek]

Because the thing is powered from the RF field of the card reader, and the max. current I can get is 3mA without any headroom for modulation. Thankfully the MSP430 takes only 350uA per MHz.

 

[kubeek]

Now that I thought to incorporate a buck converter, I should be able to pull around 5mA at 2.7V, with luck even 10mA.