TheHEF4040Bis a12-stage binary ripple counterwith a clock input (CP), an overriding asynchronous master reset input (MR) and twelve fully buffered outputs (Q0 to Q11). The counter advances on the HIGH-to-LOW transition ofCP. A HIGH on MR clears all counter stages and forces all outputs LOW, independent ofCP. Each counter stage is a static toggle flip-flop. Inputs are overvoltage tolerant to 15 V. This enables the device to be used in HIGH-to-LOW level shifting applications.