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SN74AVC32T245: Max Data Rates for 1.2V -> 1.8V and 1.8V -> 1.2V

S.Satoshi
Guru 21685 points
Part Number: SN74AVC32T245
Other Parts Discussed in Thread: TXV0108, SN74AXC8T245, TXV0106

Tool/software:

Hi,

Our customer is considering SN74AVC32T245 for following voltage translation and data rates. Can SN74AVC32T245 accept them? Their system needs 32ch signal for TX and RX each between FPGA and USB peripheral controller.

  • 1.2V -> 1,8V, 160 MHz
  • 1.8V -> 1.2V, 100 MHz

Best Regards,

Sonoki

  • 0
    Guru 303260 points

    1.2 V is the lower limit for the supply voltage, so 1.199 V would not be guaranteed to work.

    There are fast low-voltage translators like the SN74AXC8T245 or TXV0106/TXV0108, but you need multiple devices, and none of them actually guarantee that you can reach 160 MHz (320 Mbps).

  • 0
    TI__Genius 15250 points

    Hello Sonoki,

    As Clemens mentioned, you can consider using the AXC8T family for better margin at lower voltages but will force you to use multiple devices. On the AVC32T245, we can only guarantee >300Mbps when translating from 1.8V to 3.3V

    Regards,

    Josh

  • 0 in reply to Joshua Salinas
    Guru 21685 points

    Hi Clemens and Josh,

    Thank you for your suggestion. As you suggested, I'll ask customer to consider SN74AXC8T245 or TXV0108. Then can you kindly tell me the difference between these devices briefly? 

    Best Regards,
    Sonoki

  • +1 in reply to S.Satoshi
    TI__Genius 15250 points

    Hello Sonoki,

    The AXC8T has integrated pull-down resistors to assist with floating inputs, has a smaller package option and supports two DIR pins.

    The TXV0108 was made to support strict timing requires like rise/fall time, duty cycle distortion and ch-ch skew. Supports only one DIR pin which means all IOs will change direction together unlike the AXC8T.

    Regards,

    Josh