CD74HCT21MT datasheet by Texas Instruments

CD74HCT21MT Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the CD74HCT21MT?
  The recommended operating voltage range for the CD74HCT21MT is 4.5V to 5.5V, although it can operate down to 3.5V with reduced performance.
• How do I ensure that the CD74HCT21MT is properly powered on and off?
  To ensure proper power-on and power-off, the VCC pin should be ramped up and down slowly (typically within 1ms) to prevent voltage spikes and noise. Additionally, the input signals should be stable and within the recommended voltage range before applying power.
• What is the maximum frequency of operation for the CD74HCT21MT?
  The maximum frequency of operation for the CD74HCT21MT is typically around 30MHz, although this can vary depending on the specific application and operating conditions.
• How do I handle unused inputs on the CD74HCT21MT?
  Unused inputs on the CD74HCT21MT should be tied to a valid logic level (either VCC or GND) to prevent floating inputs and reduce power consumption. Floating inputs can cause the device to malfunction or consume excessive power.
• What is the maximum output current that the CD74HCT21MT can sink or source?
  The maximum output current that the CD74HCT21MT can sink or source is typically around 6mA, although this can vary depending on the specific application and operating conditions.