A logic circuit family that used to be very popular is

Chapter 13, Problem 13.4

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A logic circuit family that used to be very popular is transistor-transistor logic (TTL). The TTL logic gates and other building blocks are available commercially in smallscale integrated (SSI) and medium-scale-integrated (MSI) packages. Such packages can be assembled on printed-circuit boards to implement a digital system. The device data sheets provide the following specifications of the basic TTL inverter (of the SN7400 type):Logic-1 input level required to ensure a logic-0 level at the output: MIN (minimum) 2 V Logic-0 input level required to ensure a logic-1 level at the output: MAX (maximum) 0.8 V Logic-1 output voltage: MIN 2.4 V, TYP (typical) 3.3 V Logic-0 output voltage: TYP 0.22 V, MAX 0.4 V Logic-0-level supply current: TYP 3 mA, MAX 5 mA Logic-1-level supply current: TYP 1 mA, MAX 2 mA Propagation delay time to logic-0 level (tPHL): TYP 7 ns, MAX 15 ns Propagation delay time to logic-1 level (tPLH): TYP 11 ns, MAX 22 ns(a) Find the worst-case values of the noise margins. (b) Assuming that the inverter is in the 1-state 50% of the time and in the 0-state 50% of the time, find the averagestatic power dissipation in a typical circuit. The power supply is 5 V. (c) Assuming that the inverter drives a capacitance CL =45 pF and is switched at a 1-MHz rate, use the formula in Eq. (13.35) to estimate the dynamic power dissipation. (d) Find the propagation delay tP.

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