CD54HC157F datasheet by Texas Instruments

CD54HC157F Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of CD54HC157F?
  The maximum operating frequency of CD54HC157F is up to 100 MHz, but it depends on the input slew rate and output load capacitance.
• How to properly terminate the outputs of CD54HC157F?
  The outputs of CD54HC157F should be terminated with a pull-up or pull-down resistor to prevent floating outputs. A 1 kΩ to 10 kΩ resistor is recommended.
• Can CD54HC157F be used in a 3.3V system?
  Yes, CD54HC157F can be used in a 3.3V system, but the input voltage must not exceed 3.6V. Additionally, the output logic levels may not be compatible with 3.3V logic, so level translation may be required.
• What is the power consumption of CD54HC157F?
  The power consumption of CD54HC157F depends on the operating frequency, input voltage, and output load. The typical quiescent current is around 10 μA, and the dynamic current is around 10 mA at 100 MHz.
• How to handle the enable inputs (E1, E2) of CD54HC157F?
  The enable inputs (E1, E2) of CD54HC157F must be connected to a valid logic level (either VCC or GND) to ensure proper operation. Leaving them floating can cause unpredictable behavior.