SN74LS19A Hex Schmitt-Trigger Inverters |

SN74LS19A (ACTIVE) Hex Schmitt-Trigger Inverters



Each circuit functions as a NAND gate or inverter, but because of the Schmitt action, it has different input threshold levels for positive-going (VT+) and for negative-going (VT-) signals. The hysteresis or backlash, which is the difference between the two threshold levels (VT+ - VT-), is typically 800 millivolts.

These circuits are temperature-compensated and can be triggered from the slowest of input ramps and still give clean, jitter-free output signals.



  • Functionally and Mechanically Identical to 'LS13, 'LS14, and 'LS132, Respectively
  • Improved Line-Receiving Characteristics
  • P-N-P Inputs Reduce System Loading
  • Excellent Noise Immunity with Typical Hysteresis of 0.8 V



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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Channels (#) IOL (Max) (mA) IOH (Max) (mA) ICC (uA) Input type Output type Features Data rate (Mbps) Operating temperature range (C) Package Group
SN74LS19A Order now LS     4.75     5.25     6     8     -0.4     30000     Schmitt-Trigger     Push-Pull     High speed (tpd 10-50ns)
Input clamp diode    
70     0 to 70     PDIP | 14
SOIC | 14
SO | 14