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GATE ECE 2005 | Question: 53

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The transistors used in a portion of the TTL gate shown in the figure have a $\beta=100$. The base-emitter voltage of is $0.7 \mathrm{~V}$ for a transistor in active region and $0.75 \mathrm{~V}$ for a transistor in saturation. If the sink current $I=1 \mathrm{~mA}$ and the output is at logic $0,$ then the current $I_{R}$ will be equal to

  1. $0.65 \mathrm{~mA}$.
  2. $0.70 \mathrm{~mA}$
  3. $0.75 \mathrm{~mA}$.
  4. $1.00 \mathrm{~mA}$

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