The 74HC40103D,653 is an 8-bit synchronous binary down counter manufactured by Nexperia. It is contained in the NXP Semiconductors Counter ICs family and is designed to count synchronously in a downward direction. This device can count from 255 down to 0 at a rate determined by the external clock signal. The inputs include an enable (E) input, a clock (CLK) input, and an asynchronous reset (R) input. The output is a serial 8-bit down-counter. The 74HC40103D,653 is designed for use in applications such as frequency division, digital divider circuits, and frequency synchronization.