74HCT4040D

The 74HCT4040D from Philips is a high-speed Si-gate CMOS 12-stage binary ripple counter. It features a clock input (CP) and an overriding asynchronous master reset input (MR). The counter advances on the HIGH-to-LOW transition of the clock input. A HIGH signal on the MR input clears all counter stages and forces all outputs LOW, regardless of the clock input's state. Each counter stage is a static toggle flip-flop.

Key electrical specifications include a typical maximum operating frequency of 90 MHz (for the 74HC4040 type) and 79 MHz (for the 74HCT4040 type) at a 15 pF load and 5V supply. Propagation delay from clock input to the first output (Q0) is typically 14 ns for the 74HC4040 and 16 ns for the 74HCT4040, with delays between subsequent outputs (Qn to Qn+1) typically 8 ns. Input capacitance is 3.5 pF, and power dissipation capacitance is 20 pF.

This device is specified to operate over a wide temperature range of -40 °C to +125 °C. It complies with JEDEC standard no. 7A and offers ESD protection exceeding 2000 V for HBM and 200 V for MM.

The 74HCT4040D is available in an SO16 package, suitable for surface mount applications. Its design makes it suitable for frequency dividing circuits, time delay circuits, and control counters.