what is the normal impedance between BF561 EBIU DATA to GND?

Hi, everybody:

   We designed a BF561 hardware that worked well for 2 years. The device suddenly has a problem, SDRAM and FLASH data bit 6 and bit 7 read value is alway 1. Use a multimeter to measure the impedance of DATA6&7 pin (no power) is about 10 ohms, other DATA pins are about 32K ohms. Then remove the chip from the PCB, DATA 6&7 impedance is 0.12M ohms,  others are close to infinity.

  This phenomenon indicates that the BF561 chip is broken, or it is a soldering problem?

  • 0
    •  Analog Employees 
    on Sep 20, 2019 11:14 AM


    Have you removed and placed the ADSP-BF561 chip from your custom board before the issue existence?
    However, we have verified in our end with EZkit  board, where all the Data pins of the EBIU ADSP-BF561 are staying at the same impedance(7.6 M ohm) and We don't have processor chip for testing it.

    Anand Selvaraj.