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          74LS13           DUAL QUAD-INPUT SCHMITT TRIGGER NAND GATE              

                                                            

 

The 7413 IC is composed of two independent Schmitt-Triggered 4-Input NAND gates.

The general logical performance of these NAND gates resembles that of the 7400 or other NAND gates.The addition of the Schmitt Triggered circuitry affects the wave forms that are produced as an output.
 

Schmitt Trigger Circuits are generally constructed from a comparator, but instead of the usual negative feedback, they implement a positive feedback mechanism.

In the most simplest terms, Schmitt Trigger logic gates have a greater immunity to noise in the input lines. With noise suppression, the logic gates (in this case NANDs) are more likely to remain in their current state unless a true change to the input was intended. Glitches and high speed random noise in the lines is less likely to toggle the status of the output. 

Devices (7400 series) which include a Schmitt-Triggered Circuit:

  • 7413: Dual Schmitt trigger 4-input NAND Gate

  • 7414: Hex Schmitt trigger Inverter

  • 7419: Hex Schmitt trigger Inverter

  • 74121: Monostable Multivibrator with Schmitt Trigger Inputs

  • 74132: Quad 2-input NAND Schmitt Trigger

  • 74221: Dual Monostable Multivibrator with Schmitt Trigger Input

  • 74232: Quad NOR Schmitt Trigger

  • 74240: Octal Buffer with Schmitt Trigger Inputs and Three-State Inverted Outputs

  • 74241: Octal Buffer with Schmitt Trigger Inputs and Three-State Noninverted Outputs

  • 74244: Octal Buffer with Schmitt Trigger Inputs and Three-State Noninverted Outputs

  • 74310: Octal Buffer with Schmitt Trigger Inputs

  • 74540: Octal Buffer with Schmitt Trigger Inputs and Three-State Inverted Outputs

  • 74541: Octal Buffer with Schmitt Trigger Inputs and Three-State Noninverted Outputs

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