LPC MicrocontrollersのトピックRe: LPC5410 IO rising time too small

LPC5410 IO rising time too small

Twang — Wed, 11 Oct 2023 06:45:20 GMT

Hello, I am a hardware engineer. When using your company's LPC5410 chip, I have some questions about the parameters of I/O pins in the datasheet.
The tr and tf of the pin configured as input as described in 11.3 of the specification are between 0.3ns-1.3ns and 0.2ns-1.2ns. The data performance in the test process or tr and tf of the chip's own IO output are relatively small. May I ask if there is any error or update in the datasheet?

Re: LPC5410 IO rising time too small

Twang — Wed, 11 Oct 2023 06:55:58 GMT

Re: LPC5410 IO rising time too small

xiangjun_rong — Wed, 11 Oct 2023 08:19:11 GMT

Hi,

Of course, the data sheet can specifies the rising time and falling time of only output pins with predefined load capacitor, it can not specify the rising time and falling time of input pins, because the rising time and falling time of input pin is only dependent on the external source driving capability and the load capacitor.

So this is a typo of the documentation.

Hope it can help you

XiangJun Rong