HEF4520BT datasheet by NXP Semiconductors

HEF4520BT Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the HEF4520BT?
  The recommended operating voltage range for the HEF4520BT is 4.5V to 15.5V, although it can operate down to 3V with reduced performance.
• How do I ensure the HEF4520BT is properly powered up and initialized?
  To ensure proper power-up and initialization, make sure to follow the recommended power-up sequence, which is to apply VCC before applying any input signals. Also, ensure that the VCC supply is stable and within the recommended range before applying any input signals.
• What is the maximum frequency of operation for the HEF4520BT?
  The maximum frequency of operation for the HEF4520BT is typically around 10MHz, although this can vary depending on the specific application and operating conditions.
• How do I handle the output enable (OE) pin?
  The output enable (OE) pin is active-low, meaning that the outputs are enabled when OE is low and disabled when OE is high. Make sure to connect OE to a valid logic level (either VCC or GND) to avoid undefined output states.
• What is the purpose of the Schmitt-trigger inputs on the HEF4520BT?
  The Schmitt-trigger inputs on the HEF4520BT are designed to provide hysteresis, which helps to improve noise immunity and reduce the effects of slow input transitions. This makes the device more tolerant of noisy or slowly changing input signals.