Input Receiver With Multiple Hysteresis Levels

摘要

An integrated circuit (“IC”) includes an input receiver with multiple hysteresis levels. An exemplary input receiver may be an input buffer with a Schmitt trigger that has multiple hysteresis windows between different high and low input voltages. This circuit may improve the input noise immunity of the external input signals and timing by allowing for a selection one of the plurality of levels depending on parameters of the input (e.g. noise level).

主权项

1. A method for utilizing a multiple hysteresis circuit comprising:
receiving an input signal; identifying a speed or noise level of the input signal or device providing the input signal; and selecting one of multiple hysteresis levels, wherein higher speed and lower noise inputs utilize a smaller hysteresis level, further wherein lower speed and higher noise inputs utilize a larger hysteresis level.