Bipolar Logic Transistor-Transistor logic ◆DTL输出 ◆ TTL Gate ●增强负载能力 ● Input stage .Phase spliter h, /IR ●高低电平时,输出阻 抗差异明显—适合 ● Output stage “线与”或“线或 T2 ●多番件并接??? 6r·R外OC门 用户决定阻值 Transistor-Transistor LogieC5 Transistor-Transistor Logic ◆ TTL Gate ◆ TTL NAND Gate ●推拉式输出 ●推拉式输出 >AB=0 B Transistor-Transistor logic TTL Logic Levels ◆TTL ●输出电平 ●交导通 ● Totem Pole b VoH ●不宜并撞 ●输入电平 5V TTL Families8 Bipolar Logic ‹ DTL输出 z增强负载能力 z高低电平时，输出阻 抗差异明显——适合 “线与”或“线或” z多器件并接？？？ zRc外接—OC门 用户决定阻值 Rc A F VCC Rb B C A F VCC T2 Transistor-Transistor Logic ‹ TTL Gate zInput stage zPhase splitter zOutput stage A B F VCC T1 T2 D3 T4 T5 R1 R2 R3 R4 Transistor-Transistor LogicC5 ‹ TTL Gate z推拉式输出 ` A·B=0 T2、T5 截止 A B F VCC T1 T2 D3 T4 T5 R1 R2 R3 R4 C D Transistor-Transistor Logic ‹ TTL NAND Gate z推拉式输出 ` A=B=1 A B F VCC T1 T2 D3 T4 T5 R1 R2 R3 R4 T2、T5 饱和 Transistor-Transistor Logic ‹ TTL z交替导通 zTotem Pole z不宜并接 A B F VCC T1 T2 D3 T4 T5 R1 R2 R3 R4 TTL Logic LevelsL5 z输出电平 ` VOL ` VOH z输入电平 ` VIL ` VIH VT VOH VOL VIH VIL VCC 5V TTL Families