350 ns propagation delay — what it buys the threshold detect loop
The TLV7021DCKT is a single-channel comparator from Texas Instruments with a 350 ns propagation delay, a 4.2 mV built-in hysteresis, and an open-drain output.
4.2 mV hysteresis — no external resistors needed
The 4.2 mV internal hysteresis eliminates the two feedback resistors normally required to prevent output chatter on slow-moving or noisy input signals. For a window comparator or a simple over-temperature latch, that saves two components and a short PCB trace.
10 µA quiescent — battery-budget friendly
At 10 µA maximum quiescent current, this comparator adds negligible drain to a battery-powered sensor node. Paired with the 5 pA input bias current, it can monitor a high-impedance source like a thermistor or a photodiode without loading the signal.
78 dB CMRR and PSRR — rejection of common-mode and supply noise
With 78 dB common-mode rejection ratio and 78 dB power-supply rejection ratio, the threshold stays accurate even when the input common-mode voltage shifts or the supply has ripple. This matters in a motor-drive environment where the ground bounces and the 5 V rail carries switching noise.