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LSF0204: QSPI Signal Level Conversion

takahiro higuchi
Prodigy 180 points
Part Number: LSF0204
Other Parts Discussed in Thread: LSF0108, , TMUX1574, TXB0304, SN74AXC2T45

Tool/software:

Hi team,

We are considering the LSF0108 and LSF0204 for level conversion with QSPI NOR FLASH.
Are they usable under the following conditions?
Voltage: +1.2V (QSPI Master), +1.8V (QSPI NOR FLASH)
Speed: 25MHz
Other: Signal switching via MUX (TMUX1574)

If there are other level shifter ICs that can meet these requirements,
could you please let us know?

Best regards,

  • +1
    Guru 317080 points

    For 25 MHz signals, the LSF requires very strong pull-up resistors. The two QSPI device probably do not have enough drive strength for this.

    For the unidirection signals (/CS, SCK), use the SN74AXC2T45. For the bidirectional signals, use the TXB0304.

  • 0
    TI__Mastermind 40846 points

    Hi Higuchi-san,

    Clemens is correct here. For more information regarding level shifting QSPI applications, please reach out to your local TI contact and we can continue the discussion offline.

    Regards,

    Jack