MC54F13

    The MC54/74F13 and MC54/74F14 contain logic gates/inverters which accept standard TTL input signals and provide standard TTL output levels. MC54/74F13 and MC54/74F14 are capable of transforming slowly changing input signals into sharply defined, jitter-free output signals. Additionally, they have greater noise margin than conventional inverters.

    Each circuit of MC54/74F13 and MC54/74F14 contains a Schmitt trigger followed by a Darlington level shifter and a phase splitter driving a TTL totem pole output. The Schmitt trigger uses positive feedback to effectively speed up slow input transitions and provide different input threshold voltages for positive and negative-going transitions.This hysteresis between the positive-going and negative-going input thresholds of MC54/74F13 and MC54/74F14 (typically 800 mV) is determined internally by resistor ratios and is essen- tially insensitive to temperature and supply voltage variations.