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SN74AUC1G04: Inversion of narrow pulse-width signal

Haopeng Zhou
Prodigy 10 points
Part Number: SN74AUC1G04

I’m currently using two TI parts—SN74AUC1G04DBVR and SN74AXC1T45DBVR—to level-shift and invert a narrow pulse. My signal specs are Amplitude 1.8 V, 10 ns Pulse width and 10kHz Repetition rate. According to the datasheets, both devices support data rates above 380 Mbps or  ~1ns Tpd, so I thought they might handle these 10 ns pulses. Can this approach reliably convert and invert such a narrow pulse? If not, could you recommend alternative ICs or methods better suited for this application? Thanks in advance for any guidance!

  • 0
    TI__Mastermind 34155 points

    您好，

    已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

  • 0
    TI__Mastermind 28695 points

    Hi,

    I will address the SN74AUC1G04DBVR because my team does not support SN74AXC1T45DBVR. I will add the appropriate team to assist you with that part of your question.

    Firstly, SN74AUC1G04 is our fastest inverter gate, and it is optimized for 1.8V.

    You can assume that the 10kHz repetition rate will not be the issue for the SN74AUC1G04, but that does not answer your question about pulse width.

    However, we don't characterize the maximum frequency or pulse width of logic gates because it depends heavily on the system and customer requirements. The voltage transition rate, and pulse shape might be important to your customer, so please see This FAQ for help estimating voltage transition times based on the load.

    The only way to know for sure whether this device will work for your application is to bench test the part at the desired pulse width and frequency with a load that is equivalent to your system. This is my recommendation.

    Regards,

    Lydia

  • 0 回复 Lydia
    TI__Mastermind 28695 points

    您好，

    10ns 的脉冲宽度本身比10kHz 的脉冲宽度更大。 一般来说、如果我们假设占空比为50%、100Mbps 信号中也可以找到10ns 脉冲宽度。 在1.8V 时、考虑到 AXC1T45(142Mbps)在 VCCA=VCCB= 1.8V 时的1/ tpd 估算值、这是受支持的。 为了确保其与您的系统兼容、建议仍然使用器件(如 EVM)进行原型设计、并进行分析、以查看 SI 是否适合您的用例。

    这里需要仔细检查的一点是、这两款器件可能会串联使用、并会引入更高的传播延迟、建议检查该器件是否仍然适用于您的系统。