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LSF0108: When LSF0108 is used between Intel CPU and CPLD/FPGA

hanjun Kim
Prodigy 90 points
Part Number: LSF0108

Hi.

I used LPC I/F between INTEL CPU and CPLD/FPGA IOs.

LPC signals of INTEL CPU are 3.3V IO, but CPLD/FPGA IOs are 1.8V IO.

So I used LSF0108 for LPC I/F.

I have a question..

 Is it needed Pull-up resistors at INTEL CPU side?

I hope your help... Thanks

  • 0
    Guru 317370 points

    You always need pull-up resistors for open-drain signals, and when an LSF pin is an output (at least some of them time).

    You do not need a pull-up resistor at an LSF pin if this pin is always an input and if the device driving it uses a push/pull output.