SN74LS74ADBR datasheet by Texas Instruments

SN74LS74ADBR Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74LS74ADBR can handle?
  The maximum clock frequency of the SN74LS74ADBR is typically 35 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74LS74ADBR is properly reset during power-up?
  To ensure proper reset during power-up, connect the preset (PRE) and clear (CLR) inputs to VCC through a 1-kΩ resistor and a 0.01-μF capacitor to ground, respectively. This will ensure that the flip-flop is reset to a known state during power-up.
• What is the recommended operating voltage range for the SN74LS74ADBR?
  The recommended operating voltage range for the SN74LS74ADBR is 4.75 V to 5.25 V, with a typical operating voltage of 5 V.
• How do I handle the asynchronous preset (PRE) and clear (CLR) inputs?
  The asynchronous preset (PRE) and clear (CLR) inputs should be driven by a signal that is synchronized with the clock signal to avoid metastability issues. It's recommended to use a synchronous preset or clear signal, or to use a synchronizer circuit to synchronize the preset or clear signal with the clock signal.
• What is the propagation delay time for the SN74LS74ADBR?
  The propagation delay time for the SN74LS74ADBR is typically around 10 ns to 15 ns, depending on the operating voltage and temperature.