CD74HC191M datasheet by Texas Instruments

CD74HC191M Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the CD74HC191M can handle?
  The CD74HC191M can handle clock frequencies up to 25 MHz, but it's recommended to check the specific application and operating conditions to ensure reliable operation.
• How do I ensure that the CD74HC191M is properly powered and decoupled?
  It's essential to provide a stable power supply with a decoupling capacitor (typically 0.1 μF) close to the VCC pin to ensure proper operation and reduce noise. Additionally, follow proper PCB layout and grounding practices.
• Can I use the CD74HC191M in a 5V system?
  Yes, the CD74HC191M 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 avoid damage or malfunction.
• How do I handle the asynchronous clear (CLR) input?
  The CLR input should be synchronized with the clock signal to avoid metastability issues. It's recommended to use a synchronous clear or a clock-enabled clear signal to ensure reliable operation.
• What is the maximum output current that the CD74HC191M can sink or source?
  The CD74HC191M can sink or source up to 6 mA per output pin, but it's recommended to check the specific application and output loading to ensure reliable operation.