Given that for a logic family,

$${V_{OH}}$$ is the minimum output high-level voltage
$${V_{OL}}$$ is the minimum output low-level voltage
$${V_{IH}}$$ is the minimum output high-level voltage and
$${V_{IL}}$$ is the minimum output low-level voltage.
The correct relationship is:

Fill in the blanks of the statements below concerning the following Logic Families:
Standard TTL (74XX), Low power TTL(74LXX) Low power schottky TTL(74LSXX), schottky TTL(74 SXXX), Emitter coupled Logic (ECL), CMOS

(a) Among the TTL Families, ________ family requires considerably less power than the standard TTL (74XX) and also has com parable proparation delay.
(b) Only the _______ family can operate over a wide range of power supply voltages.

The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X, result in a binary number without overflow. This implies that the result is:

A transmission line of pure resistive characteristic impedance is terminated with an unknown load. The measured value of VSWR on the line is equal to 2 and a voltage minimum point is found to be at the load. The load impedance is then