CD74HC173M datasheet by Texas Instruments

CD74HC173M Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the CD74HC173M?
  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.
• How do I handle the asynchronous clear input (CLR) in my design?
  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.
• What is the recommended power-on reset (POR) circuit for the CD74HC173M?
  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.
• Can I use the CD74HC173M as a synchronous counter?
  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.
• How do I cascade multiple CD74HC173M counters?
  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.