obsidian-notes/数字电路/电平/电平匹配.md
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---
title: 电平匹配
updated: 2022-08-08 08:47:47Z
created: 2022-08-08 08:34:50Z
---
MCU CPLD FPGA 输出电压大都是==3.3V== 射频器件大都工作在==5.0V==
控制过程中就有电压匹配的问题大部分5.0V器件兼容3.3V控制电平,也就是==VIH≥2.0V有些则必须≥0.7V==详见datasheet原理分析可参见 [TTL和CMOS的比较](TTL和CMOS的比较.md)