SN54LS595J datasheet by Texas Instruments

SN54LS595J Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the SN54LS595J?
  The maximum clock frequency for the SN54LS595J is 30 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 SN54LS595J as a latch?
  Yes, the SN54LS595J can be used as a latch by tying the clock input (CLK) high and using the serial input (SER) to load data into the shift register. However, keep in mind that the device is designed as a shift register, and using it as a latch may not be the most efficient or optimal solution.
• How do I handle the initial power-up state of the SN54LS595J?
  The SN54LS595J has an undefined power-up state, which means that the output state is not guaranteed after power-up. To ensure a known initial state, it's recommended to use an external reset signal or to clock in a known state after power-up.
• Can I use the SN54LS595J with a microcontroller that has a 3.3V output?
  Yes, the SN54LS595J is compatible with 3.3V logic levels, but it requires a 5V supply voltage (VCC). You can use a level translator or a voltage divider to interface the 3.3V microcontroller output with the SN54LS595J input.
• What is the maximum current that the SN54LS595J can sink or source?
  The SN54LS595J can sink up to 24 mA and source up to 15 mA per output pin. However, it's recommended to check the datasheet for specific current limits and to ensure that the device is operated within its recommended operating conditions.