74LS14 – Hex Schmitt-Trigger Inverters

Part number : 74LS14, SN74LS14, HD74LS14, DM74LS14

Function : Hex Inverter with Schmitt Trigger Inputs

Package : DIP  14 Pin, SOIC 14 Pin

Manufacturer : Fairchild, Motorola, Texas Instruments


74LS14 - Hex Schmitt-Trigger Inverters


The 74LS14 contains logic gates / inverters which accept 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.

This device contains six independent gates each of which performs the logic INVERT function. Each input has hysteresis which increases the noise immunity and transforms a slowly changing input signal to a fast changing, jitter free output.


74LS14 pinout datasheet


1. Operation From Very Slow Edges
2. Improved Line-Receiving Characteristics
3. High Noise Immunity


1. HVAC Gateways
2. Residential Ductless Air Conditioning Outdoor Units
3. Robotic Controls
4. Industrial Stepper Motors
5. Power Meter and Power Analyzers
6. Digital Input Modules for Factory Automation


74LS14 Datasheet