The maximum clock frequency for the CD74HC173M is 25 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the timing diagrams and switching characteristics in the datasheet to ensure proper operation.
The asynchronous clear input (CLR) is an active-low input that resets the counter to zero when it's low. To use it, connect CLR to a logic low signal when you want to reset the counter. Make sure to synchronize the CLR signal with the clock signal to avoid metastability issues.
Texas Instruments recommends using a power-on reset (POR) circuit to ensure that the counter is properly reset during power-up. A simple POR circuit can be implemented using a resistor, capacitor, and diode connected to the VCC pin. The datasheet provides a recommended POR circuit diagram.
Yes, the CD74HC173M can be used as a synchronous counter. To do so, connect the clock input (CLK) to a clock signal, and the counter will increment or decrement synchronously with the clock signal. Make sure to meet the setup and hold time requirements for the clock signal.
To cascade multiple CD74HC173M counters, connect the carry output (CO) of one counter to the clock input (CLK) of the next counter. This allows the counters to count in sequence, enabling the creation of larger counters or more complex counting circuits.
CD74HC173M datasheet
by Texas Instruments
