SN74HCT139DR datasheet by Texas Instruments

SN74HCT139DR Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74HCT139DR?
  The maximum frequency of operation for the SN74HCT139DR is 40 MHz.
• Can I use the SN74HCT139DR in a 5V system?
  Yes, the SN74HCT139DR is compatible with 5V systems, but it's recommended to use a voltage regulator to ensure a stable 5V supply.
• How do I handle the enable inputs (E1 and E2) when not in use?
  When not in use, the enable inputs (E1 and E2) should be tied to VCC or GND to prevent floating inputs, which can cause unpredictable behavior.
• What is the maximum current that the SN74HCT139DR can sink or source?
  The SN74HCT139DR can sink or source up to 6 mA of current per output pin.
• Can I use the SN74HCT139DR in a 3.3V system?
  No, the SN74HCT139DR is not compatible with 3.3V systems. It's designed to operate at 4.5V to 5.5V.