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LEVELS OF DELAY代表什么意思
感谢您对TI产品的关注！关于你的咨询，这个SN74S138A芯片太老了。levels of delay延迟等级仅仅是个参考值，你可以忽略它。功能相同品 CD74ACT138都已经取消了这个参数。
www.ti.com.cn/.../CD74ACT138
Propagation Delay Time定义，你可以参考下面技术报告书。www.ti.com.cn/.../szza036c.pdf
LEVELS OF DELAY代表什么意思