M74HC138M1R datasheet by STMicroelectronics

M74HC138M1R Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the M74HC138M1R?
  The maximum frequency of operation for the M74HC138M1R is 25 MHz.
• How do I ensure that the M74HC138M1R is properly powered?
  Ensure that the VCC pin is connected to a stable 5V power supply, and the GND pin is connected to a reliable ground. Also, decouple the power supply with a 0.1uF capacitor to reduce noise.
• What is the maximum current that the M74HC138M1R can sink or source?
  The M74HC138M1R can sink or source up to 20mA of current per output pin.
• How do I use the M74HC138M1R as a 3-to-8 decoder?
  Connect the A0, A1, and A2 input pins to the 3-bit binary input, and the Y0-Y7 output pins will be asserted based on the input code. Use the E1 and E2 enable inputs to enable or disable the decoder.
• What is the propagation delay of the M74HC138M1R?
  The propagation delay of the M74HC138M1R is typically around 10ns, but can vary depending on the operating conditions and load capacitance.