HEF4040BT,653

The HEF4040BT is a 12-stage Binary Ripple Counter with 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 of CP\. A high on MR clears all counter stages and forces all outputs low, independent of CP\. Each counter stage is a static toggle flip-flop. The clock input is highly tolerant of slow rise and fall times due to its Schmitt trigger action. It operates over a recommended VDD power supply range of 3 to 15V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS or another input.