The maximum clock frequency of the SN74HC4040DBR is 30 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
To ensure that the counter resets properly, make sure to assert the reset pin (R) low for at least 10 ns. Also, ensure that the clock pin (CLK) is low when the reset pin is asserted to prevent counting during reset.
The maximum output current that the SN74HC4040DBR can sink or source is 25 mA per pin. However, it's recommended to limit the output current to 10 mA per pin to ensure reliable operation.
Yes, the SN74HC4040DBR can operate in a 5V system, but it's recommended to use a voltage regulator to ensure a stable 5V supply. Also, be aware that the output voltage levels may not be compatible with 5V logic levels, so additional circuitry may be required.
The asynchronous reset input (R) is edge-triggered, so it's essential to ensure that the reset signal is synchronized with the clock signal to prevent metastability issues. Use a flip-flop or a synchronizer circuit to synchronize the reset signal with the clock signal.
SN74HC4040DBR datasheet
by Texas Instruments
