SN74HC251NSR datasheet by Texas Instruments

SN74HC251NSR Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the SN74HC251NSR?
  The maximum operating frequency of the SN74HC251NSR is 50 MHz, but it can vary depending on the specific application and operating conditions.
• How do I handle the enable pins (EN1 and EN2) in my design?
  The enable pins (EN1 and EN2) are active-low, meaning that the device is enabled when the pins are low. You can tie them to GND or use a logic signal to control the device's operation.
• What is the recommended power-on sequence for the SN74HC251NSR?
  The recommended power-on sequence is to apply power to the VCC pin before applying any input signals. This ensures that the device is properly initialized and minimizes the risk of latch-up or other issues.
• Can I use the SN74HC251NSR in a 5V system?
  Yes, the SN74HC251NSR is compatible with 5V systems, but you should ensure that the input signals do not exceed the maximum rating of 5.5V. Additionally, you may need to use level shifters or voltage dividers to interface with 5V logic signals.
• How do I handle the output enable (OE) pin in my design?
  The output enable (OE) pin is active-low, meaning that the outputs are enabled when the pin is low. You can tie it to GND or use a logic signal to control the output state.