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Definition of "Pull-up Resistor" |
A resistor tied to Vcc to pull a line high when not being used. How to calculate a Pullup resistor. / Pull-up resistor are used in electronic logic circuits to ensure that inputs to logic systems settle at expected logic levels if external devices are disconnected or high-impedance is introduced. They may also be used at the interface between two different types of logic devices, possibly operating at different power supply voltages. / Within Internet message handling services, a message transfer agent or mail transfer agent or mail relay is software that transfers electronic mail messages from one computer. An MTA implements both the client and server portions of the Simple Mail Transfer Protocol. |
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