SN74LS390D datasheet by Texas Instruments

SN74LS390D Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74LS390D can handle?
  The maximum clock frequency of the SN74LS390D is 25 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74LS390D is properly powered and decoupled?
  To ensure proper power and decoupling, use a 5V power supply, add a 0.1uF ceramic capacitor between VCC and GND, and use a 10uF electrolytic capacitor between VCC and GND for bulk decoupling.
• What is the maximum output current that the SN74LS390D can sink or source?
  The SN74LS390D can sink or source up to 16mA of current per output pin, but it's recommended to limit the current to 10mA or less to ensure reliable operation.
• How do I handle the asynchronous reset input (R) on the SN74LS390D?
  The asynchronous reset input (R) should be tied to VCC through a 1kΩ resistor and a 0.01uF capacitor to ensure proper reset operation.
• Can I use the SN74LS390D in a 3.3V system?
  No, the SN74LS390D is designed to operate at 5V and is not compatible with 3.3V systems. Using it in a 3.3V system may result in unreliable operation or damage to the device.