SN74HC139DBR datasheet by Texas Instruments

SN74HC139DBR Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the SN74HC139DBR?
  The maximum operating frequency of the SN74HC139DBR is 25 MHz, but it can vary depending on the specific application and operating conditions.
• 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 a logic level (either VCC or GND) to prevent floating inputs and ensure proper device operation.
• What is the recommended power-on sequence for the SN74HC139DBR?
  The recommended power-on sequence is to apply power to the VCC pin before applying any input signals to ensure proper device operation and prevent latch-up.
• Can I use the SN74HC139DBR in a 5V system?
  Yes, the SN74HC139DBR is compatible with 5V systems, but it's essential to ensure that the input signals and output loads are within the recommended operating conditions to prevent damage or malfunction.
• How do I determine the propagation delay of the SN74HC139DBR?
  The propagation delay of the SN74HC139DBR can be determined by consulting the datasheet, which provides typical and maximum values for propagation delay (tPD) under various operating conditions.