SN74AHC595DRE4 datasheet by Texas Instruments

SN74AHC595DRE4 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the SN74AHC595DRE4?
  The maximum clock frequency for the SN74AHC595DRE4 is 100 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the datasheet for specific frequency limits at different operating conditions.
• Can I use the SN74AHC595DRE4 as a level shifter?
  Yes, the SN74AHC595DRE4 can be used as a level shifter, but it's not its primary function. It's designed as a shift register, and its output voltage levels may not be suitable for all level-shifting applications. However, it can be used to shift voltage levels from 1.65 V to 5.5 V.
• How do I ensure that the SN74AHC595DRE4 outputs are in a known state during power-up?
  To ensure that the outputs are in a known state during power-up, you can use the OE (output enable) pin to disable the outputs during power-up. You can also use an external pull-up or pull-down resistor to set the output state. Additionally, some devices may have a power-on reset (POR) circuit that can help initialize the outputs to a known state.
• Can I use the SN74AHC595DRE4 in a 3.3 V system?
  Yes, the SN74AHC595DRE4 can operate in a 3.3 V system. It's specified to operate from 1.65 V to 5.5 V, making it suitable for 3.3 V systems. However, ensure that the input and output voltage levels are within the recommended operating range.
• How do I handle the latency of the SN74AHC595DRE4 when shifting data?
  The SN74AHC595DRE4 has a latency of 10 ns (typical) from the clock edge to the output change. To handle this latency, you can add a delay or use a clock enable signal to synchronize the data transfer. You can also use a FIFO or a buffer to store the data temporarily while the shift register is updating.