Chris Farrar Hex Inverter – 7404, 74LS04, and 7405

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Presentation transcript:

Chris Farrar cjf154@psu.edu Hex Inverter – 7404, 74LS04, and 7405 Pins: VCC, Ground, Input, Output 7404 In VCC Propagation Delay: 12ns - Typ Out In Price: 59 cents In Out Out In 74LS04 In Out Out In Propagation Delay: 9ns - Typ GND Out Price: 29 cents 7405 Propagation Delay: 40ns - Typ Price: 29 cents

7404 & 74LS04 – Hex Inverters 7404 74LS04 VCC 5V VIH 2V - Min 2V – Min VIL 0.8V - Max IOH -0.4mA - Max IOL 16mA - Max 8mA - Max VOH 3.4 V 3.4V VOL 0.2V 0.25V IIH 40uA - Max 20uA – Max IIL -1.6uA - Max

Calculating R This inverter with an open collector output can be thought of as a switch. When ground is connected to the input the switch is considered closed, when 5 v is connected to the input the switch is considered open. Since current only goes into this device, in order to figure out R, you must first find how much current you need. The device alone can only handle 16 mA. So for an example, the minimum resistance that R can be for this device is 5V/16mA or 312.5 ohms.