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What does it mean to use an open collector? What role does the \"pull-up\" resistor...

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Electrical Engineering


What does it mean to use an open collector? What role does the \"pull-up\" resistor play? 

Say device \"A\" wanted to send a \"1\" on the wire, what would device A need to drive? What would the other devices be driving when they weren't trying to use the bus? 

Say device \"A\" wanted to send a \"0\" on the wire. What would device A need to drive? What would the other devices be driving when they weren't trying to use the bus? i. ii. iii.

Answer & Explanation Solved by verified expert
3.6 Ratings (250 Votes)
i An open collector is a configuration where the base of theoutput transistor is driven by the circuit the emitter is groundedand the collector is opennot connected and the external terminalis provided outwards This is to avoid problems when the same busis driven by outputs of multiple devices The transistor acts as apulldown networkif the transistor is on the output is zero andthe resistor connected between the supply and the collector acts asa pullup network To understand what is the problem if    See Answer
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