BUY MC14557BCP https://www.utsource.net/itm/p/1016589.html
Dual Processor Supervisory Circuits 8-SOIC -40 to 85
Description: The MC14557BCP is a dual 4-input NAND Schmitt Trigger from Motorola Semiconductor. Features: - Low power consumption - High noise immunity - High input impedance - Low output saturation voltage - High speed operation Applications: - Pulse generation - Clock and timing circuits - Signal conditioning - Interface circuits - Level detection - Waveform shaping (For reference only)