Quad NAND gate with Schmitt-trigger inputs — why the hysteresis matters
The CD74HCT132MT is a quad 2-input NAND gate from the 74HCT series, integrating four independent NAND gates on a single 14-SOIC package. Each gate features Schmitt-trigger inputs, which provide hysteresis for clean switching on noisy or slowly changing signals. This makes it a common choice for debouncing switch contacts, squaring up oscillator waveforms, and conditioning signals in industrial or automotive environments where noise is a concern.
Supply range and logic levels — 5V TTL-compatible operation
The part operates from a 4.5V to 5.5V supply, making it a direct fit for 5V digital systems. Input logic levels are specified as 0.5V to 0.6V for low and 1.9V to 2.1V for high, which are TTL-compatible thresholds — so it can be driven by 5V TTL outputs without level translation. Output drive capability is 4mA for both high and low states, sufficient for driving standard CMOS loads or a few TTL inputs.
Temperature grade and environment
Rated for -55°C to 125°C operating temperature.
Propagation delay and timing budget
Maximum propagation delay is 33ns at 4.5V with a 50pF load. This sets the timing floor for signal conditioning: a 33ns delay means the part can filter out glitches shorter than that window, but also adds that much latency to the signal path. For most switch debounce and clock shaping applications, 33ns is well within budget.