电平类型 电平等级 VIH VIL VOH VOL TTL 5V >=2 <=0.8 >=2.4 <=0.5 LVTTL 3.3V >=2 <=0.8 >=2.4 <=0.4 2.5V >=1.7 <=0.7 >=2 <=0.2 CMOS 5V >=3.5 <=1.5 >=4.45 <=0.5 LVCOMS 3.3V >=2 <=0.7 >=3.2 <=0.1 2.5V >=1.7 <=0.7 >=2 <=0.1 RS-232 +3—+12 -3— -12 +5—+15 -5— -15 RS485 BA间电平>=0.2 BA间电平<=-0.2 AB间电平+2—+6 AB间电平-2— -6 为逻辑“1” 为逻辑“0” 为逻辑“1” 为逻辑“0” |
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