The maximum clock frequency of the SN74HC174DBR is 100 MHz, but it can vary depending on the operating voltage and load capacitance. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
To ensure proper power and decoupling, connect the VCC pin to a stable 2-6V power supply, and decouple the power pins with 0.1uF ceramic capacitors as close to the device as possible. Additionally, use a 10uF bulk capacitor for further decoupling.
The SN74HC174DBR can sink or source up to 25mA of current per output pin, but it's recommended to limit the current to 10mA or less to ensure reliable operation and prevent overheating.
The asynchronous clear (CLR) input should be tied to VCC through a pull-up resistor (e.g., 1kΩ) to prevent accidental clearing of the flip-flops. When CLR is low, the flip-flops are reset, and the outputs are cleared.
To minimize noise and signal degradation, use a solid ground plane, keep signal traces short and away from power traces, and avoid running clock signals near the flip-flop outputs. Also, use a low-impedance power supply and decoupling capacitors to reduce noise.
SN74HC174DBR datasheet
by Texas Instruments
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