NXP HEF4093BT Quad NAND Gate with Schmitt Trigger SMD IC

The HEF4093B is a quad two-input NAND gate. Each input has a Schmitt trigger circuit. The gate switches at different points for positive-going and negative-going signals. The difference between the positive voltage (VT+) and the negative voltage (VT) is defined as hysteresis voltage (VH)