| ??? 12/21/06 16:01 Read: times |
#129911 - I'm a chip provider, not a user Responding to: ???'s previous message |
Kai said:
Ok, that means that you will test each part before using in a project?? Check all temperature, Vcc, capacitive load dependencies?? And you also make an accelerated aging test to see how the parameters drift?? Definitely, users should design to the data sheet. They should also pay their taxes on time, and not run red lights. But many users don't follow the rules. And that is why I have to determine what a part actually does, rather than just match the published spec. Here is an example. I replaced the NXP 83C751, which has an I2C port on it. My first silicon matched the NXP specs, but was weaker on the I2C pins than the actual NXP parts were. A large customer had a mistake on one of their boards where they had used a 220 ohm pullup rather than a 10K one. As a result, my chip did not work, while the NXP one did. The resistor was on a separate board and in existing systems, so it was not possible to fix the resistor. If I wanted the sales, I had to modify my part to match the actual NXP characteristics. And so I did. |
