CD74HC597MG4 datasheet by Texas Instruments

CD74HC597MG4 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the CD74HC597MG4?
  The maximum clock frequency for the CD74HC597MG4 is 30 MHz, but it's recommended to operate at 20 MHz or lower for reliable operation.
• How do I handle the asynchronous clear (CLR) input?
  The asynchronous clear (CLR) input should be tied to VCC through a pull-up resistor (e.g., 1 kΩ) to prevent accidental clearing of the counter. When CLR is low, the counter is reset to zero.
• What is the purpose of the enable (EN) input?
  The enable (EN) input allows the counter to be enabled or disabled. When EN is high, the counter is enabled and counts clock pulses. When EN is low, the counter is disabled and holds its current count.
• How do I cascade multiple CD74HC597MG4 counters?
  To cascade multiple counters, connect the carry-out (CO) output of one counter to the clock (CLK) input of the next counter. Ensure that the counters are properly synchronized and that the clock signal is distributed correctly.
• What is the recommended power-on reset (POR) circuit for the CD74HC597MG4?
  A recommended POR circuit involves connecting a capacitor (e.g., 0.1 μF) from VCC to GND, with a resistor (e.g., 1 kΩ) in series. This ensures a clean power-on reset and prevents spurious counter operation.