|Symbol Parameter Min Max Unit
VCC Supply Voltage 4.75 5.25 V
IOH High Level Output Current -15 mA
IOL Low Level Output Current 24 mA
TA Ambient Temperature Range 0 +70 °C The 74LS14 contain logic gates/inverters which accpet standard TTL input signals and provide standard TTL output levels. They 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 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 (typically 800 mV) is determined internally by resistor ratios and is essentially insensitive to temperature and supply voltage variations.