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the Frequency(Max) @the respective conditions for SN74LVC1G125 & SN74AVC2T45

Hidetoshi Matsunami
Expert 2750 points
Other Parts Discussed in Thread: SN74AVC2T45, SN74LVC1G125, SN74LVC1G74

Hello Team,

My customer would like to know the Frequency(Max) for SN74LVC1G125 & SN74AVC2T45.

Could you tell me the Frequency(Max) @the following conditions?

  • SN74LVC1G125

1) Vcc: 1.8V, input: LVCMOS 33, output: LVCMOS 18

2) Vcc: 1.8V, input: LVCMOS 18, output: LVCMOS 18

  • SN74AVC2T45 (A to B)

1) Vcca: 1.8V, Vccb: 1.8V, input(A): LVCMOS 18, output(B): LVCMOS 18

2) Vcca: 3.3V, Vccb: 1.8V, input(A): LVCMOS 33, output(B): LVCMOS 18

3) Vcca: 1.8V, Vccb: 3.3V, input(A): LVCMOS 18, output(B): LVCMOS 33

Best Regards,

Hidetoshi Matsunami

  • 0
    TI__Genius 9860 points
    Hi Matsunami-san,

    We have estimates for frequency of input. As a general rule, we use the fMAX specification of a part in the same family with a CLK input to estimate input frequency capability.

    The SN74LVC1G125 can handle 80 MHz at VCC = 1.8 V. I obtained this estimate from the fMAX parameter in the SN74LVC1G74 (D-type flip flop) datasheet.

    As for the AVC device, I will move this post to the Voltage Level Translation forum.
    -Ryan
  • 0 in reply to C. Ryan Land
    TI__Expert 6430 points
    Hi Matsunami-san,
    For SN74AVC2T45, the data rate will depend on power supply and output load.
    1) Vcca: 1.8V, Vccb: 1.8V, input(A): LVCMOS 18, output(B): LVCMOS 18
    The input siganl frequency is up to 160MHz when output load is 15pF.
    2) Vcca: 3.3V, Vccb: 1.8V, input(A): LVCMOS 33, output(B): LVCMOS 18
    The input siganl frequency is up to 160MHz when output load is 15pF.
    3) Vcca: 1.8V, Vccb: 3.3V, input(A): LVCMOS 18, output(B): LVCMOS 33
    The input siganl frequency is up to 160MHz when output load is 15pF.ThanksWei
  • 0 in reply to Wei Lang
    Expert 2750 points

    Hi Ryan and Wei,

    I appreciate your support.I will reply to my customer.

    Best Regards,

    Hidetoshi Matsunami