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Electronics => FPGA => Topic started by: c64 on January 20, 2022, 05:34:13 am

Title: ATF22v10b outputs oscillate
Post by: c64 on January 20, 2022, 05:34:13 am
I programmed few of them and they all have same strange behavior. I have test PCB to test if they work correctly. No long wires, traces ~5cm long, solid ground, 4 layers, decoupling. After switching inputs for few seconds some outputs suddenly start oscillating in the range 3-5v at about 400kHz. Well, technically it's withing TTL levels but still strange

Part number is ATF22V10BQL in PLCC package. I program them using arduino/afterburner. I did conditioning (writing all 0) before programming.
Title: Re: ATF22v10b outputs oscillate
Post by: Beta_vulgaris on January 20, 2022, 07:36:19 am
Pin 4 (DIP, PLCC pin 5) Power Down not disabled?
Title: Re: ATF22v10b outputs oscillate
Post by: c64 on January 21, 2022, 03:29:54 am
It doesn't have power down pin. Power down is automatic and can not be disabled (AFAIK)