LM319High-speed dual voltage comparator

LM319 contains two high-speed voltage comparators. Each compares an input pair and controls an open-collector output, allowing the pull-up supply and output-stage return to be chosen within the device limits. It makes threshold decisions rather than providing linear op-amp gain. This page selects TI LM319N/NOPB in PDIP-14 and LM319M/NOPB in SOIC-14, both commercial 0–70°C parts. Four physical pins are unconnected. The fourteen-pin drawing defines the mapping; it must not be confused with the family’s ten-pin metal-can arrangement. The example uses a 5 V supply, a 2 V divider reference and a 1.5 V input. A 10 kΩ pull-up lets the first output indicate LOW or HIGH. Both inputs stay in the 1–3 V common-mode range; the second comparator is also given defined inputs. The quoted 80 ns response is typical under ±15 V test conditions, not a speed guarantee for this 5 V example.