74HC138BQ,115 datasheet by NXP Semiconductors

74HC138BQ,115 Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the 74HC138BQ,115?
  The maximum frequency of operation for the 74HC138BQ,115 is 25 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the 74HC138BQ,115 is properly powered and decoupled?
  To ensure proper power and decoupling, connect the VCC pin to a stable 2.0-6.0 V power supply, and decouple the power supply lines with 0.1 μF and 10 μF capacitors. Additionally, use a 10 kΩ pull-up resistor on the enable inputs (E1, E2, and E3) to prevent unwanted switching.
• What is the maximum current that the 74HC138BQ,115 can sink or source?
  The 74HC138BQ,115 can sink up to 25 mA and source up to 25 mA per output pin, with a total current limit of 100 mA per package.
• How do I handle the enable inputs (E1, E2, and E3) when they are not used?
  When the enable inputs are not used, they should be tied to VCC or GND through a 10 kΩ pull-up or pull-down resistor to prevent unwanted switching and ensure proper operation.
• Is the 74HC138BQ,115 compatible with 5V and 3.3V logic levels?
  Yes, the 74HC138BQ,115 is compatible with both 5V and 3.3V logic levels, making it suitable for use in a wide range of applications.