CD74HCT158E datasheet by Texas Instruments

CD74HCT158E Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the CD74HCT158E?
  The maximum operating frequency of the CD74HCT158E is 30 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure signal integrity when using the CD74HCT158E?
  To ensure signal integrity, use proper PCB layout techniques, such as keeping signal traces short and away from noise sources, and using decoupling capacitors to reduce noise and ringing.
• Can I use the CD74HCT158E with 3.3V or 5V logic levels?
  The CD74HCT158E is designed to operate with 4.5V to 5.5V supply voltage, but it can tolerate 3.3V logic levels on the input pins. However, the output voltage levels will still be 5V.
• How do I handle power-up and power-down sequencing with the CD74HCT158E?
  To avoid latch-up or other issues, ensure that the power supply voltage (VCC) is stable and within the recommended range before applying input signals. Also, ensure that the input signals are stable and valid before enabling the output enables (OE) pins.
• What is the maximum current that the CD74HCT158E can sink or source?
  The CD74HCT158E can sink or source up to 6mA of current per output pin, but it's recommended to limit the current to 4mA or less to ensure reliable operation.