Inverting buffer and driver, SN74LS14N, Texas Instruments The SN74LS14N is a hex schmitt trigger inverter and has different input threshold levels for positive-going (VT+) and negative-going (VT–) signals. This device temperature compensated and can be triggered from the slowest of input ramps and still give clean, jitter-free output signals. Features Operation from very slow edges Improved line-receiving characteristics High noise immunity Applications Residential ductless air conditioning outdoor units Power meter and power analyzers Digital input modules for factory automation Industrial stepper motors HVAC gateways