SN74AHC74DBR datasheet by Texas Instruments

SN74AHC74DBR Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74AHC74DBR can handle?
  The maximum clock frequency of the SN74AHC74DBR is 100 MHz, but it can vary depending on the operating conditions and the quality of the clock signal.
• How do I ensure that the flip-flops are properly initialized on power-up?
  To ensure proper initialization, connect the preset (PRE) and clear (CLR) inputs to a valid logic level (either VCC or GND) through a pull-up or pull-down resistor. This will ensure that the flip-flops are initialized to a known state on power-up.
• What is the recommended operating voltage range for the SN74AHC74DBR?
  The recommended operating voltage range for the SN74AHC74DBR is 2.0 V to 5.5 V, with a typical operating voltage of 3.3 V or 5 V.
• How do I handle the asynchronous preset and clear inputs?
  The asynchronous preset and clear inputs (PRE and CLR) should be synchronized with the clock signal to avoid metastability issues. This can be done by using a synchronizer circuit or by ensuring that the preset and clear inputs are stable before the clock signal is applied.
• What is the maximum propagation delay time for the SN74AHC74DBR?
  The maximum propagation delay time for the SN74AHC74DBR is approximately 10 ns, but this can vary depending on the operating conditions and the load capacitance.