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PCIe PERST# FAN OUT

Perry Chuang
Prodigy 130 points
Other Parts Discussed in Thread: SN74LVC1G17, SN74AHC541, SN74AHC125

HI,

I would like to know what items can use for PCIe perst# 4 fan out and 8 fan out

B&R

perry

  • 0
    Guru 298810 points

    PERST is defined as a 3.3 V logic signal.

    The fan-out depends on how large the loads actually are. Do you have four/eight devices on one board, or four/eight PCIe connectors?

    Anyway, for normal loads, it should be enough to use a single buffer with high drive strenghth, such as the SN74LVC1G17.

  • 0 in reply to Clemens Ladisch
    Prodigy 130 points

    hi,

    The following drawing is PCIe PERST# Diagram for 4 fan out & 8 fan out

    I need to know which IC is suitable to design in circuit .

  • 0 in reply to Perry Chuang
    Guru 298810 points

    I do not know how large the (capacitive) load of the Mini-SAS HD connectors/cables is. But if you want separate drivers for every pin, use quad/octal buffers, e.g., SN74AHC125 and SN74AHC541.