SN74LS19A

The SN74LS19A circuit functions as a NAND gate or inverter, but because of the schmitt action, it has different input threshold levels for positive-going and for negative-going signals. The features of SN74LS19A are as follows: (1)functionally and mechanically identical; (2)improved line-receiving characteristics; (3)P-N-P inputs reduce system loading; (4)excellent noise immunity with typical hysteresis of 0.8V.

The absolute maximum ratings of the SN74LS19A are: (1)supply voltage, VCC: 7V; (2)input voltage: 7V; (3)operating free-air temperature range: 0 to 70; (4)storage temperature range: -65 to 150.

The following is about the electrical characteristics of SN74LS19A: (1)VT+: 1.65V min, 1.9V typical and 2.15V max at VCC=5V; (2)VT-: 0.75V min, 1.0V typical and 1.25V max at VCC=5V; (3)hysteresis: 0.4V min and 0.9V typical at VCC=5V; (4)VIK: -1.5V max at VCC=min, II=-18mA; (5)VOH: 2.7V min and 3.4V typical at VCC=min, VI=VT-min, IOH=-0.4mA; (6)VOL: 0.25V typical and 0.4V max at VCC=min, VI=VT+min, IOL=4mA; (7)II=0.1mA max at VCC=max, Vi=7V; (8)IIH: 20A max at VCC=max, VI=2.7V; (9)IIL: -50A max at VCC=max, VI=0.4V; (10)ICCL: 17mA typical and 30mA max at VCC=max, VI=4.5V.