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SN74AXC1T45: Is 125MHz clock signal supported from 1.2V to 1.8V?

Part Number: SN74AXC1T45

Hi Team,

Customer wants to convert the 125Mhz clock signal from 1.2V to 1.8V, the datasheet says "Up to 500-Mbps Support When Translating from 1.8 to 3.3V". I think 125Mhz equals to 250Mbps.

Could you please help confirm if 125Mhz is supported on the EVM? The conditions are

1. VCCA is 1.2V, VCCB is 1.8V

2. the direction is A to B

3. 125Mhz is the input at A.

I know the data rate is related to the specific design. Can you share the scopeshot of the test on SN74AXC1T45EVM? Thank!

Best Regards,

Hao

  • Hi Hao,

    Since this spec is not guaranteed on the datasheet, we cannot confirm that 125Mhz can be supported.
    From the char data, I see that there are few instances that the device can support up to 100Mhz for your specified Vcc range.
  • It is up to the customer to try the device and accept the performance knowing that the device datasheet has not mentioned or guaranteed the data rate spec. To note that the pass criteria while measuring the data rate is the signal integrity, with the voltage swing of the waveform crosses the threshold region of the output Vcc supply, maintaining the datasheet guaranteed Voh and Vol. Usually, the Voh is above the receiving device's Vih level and the Vol level is below the receiving device's Vil level. The char data was collected at 15pF cap load driving into a Hi-Z load on the output.