SN74AS890GB datasheet by Texas Instruments

SN74AS890GB Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74AS890GB can handle?
  The maximum clock frequency of the SN74AS890GB is 100 MHz, but it can operate up to 150 MHz with a reduced voltage supply (VCC) of 3.3V.
• How do I ensure signal integrity and minimize noise in my design?
  To ensure signal integrity and minimize noise, use a low-impedance PCB design, keep signal traces short, and use decoupling capacitors (e.g., 0.1 μF) close to the device. Additionally, consider using a clock buffer or repeater to reduce clock skew and jitter.
• What is the recommended termination scheme for the outputs of the SN74AS890GB?
  The recommended termination scheme for the outputs of the SN74AS890GB is a series termination with a 33-ohm resistor and a 10-pF capacitor to ground. This helps to reduce reflections and improve signal quality.
• Can I use the SN74AS890GB in a 3.3V system, and if so, what are the implications?
  Yes, the SN74AS890GB can operate in a 3.3V system, but the output voltage will be reduced to approximately 2.4V. This may affect the noise margin and signal integrity in your design. Ensure that your system can accommodate this reduced output voltage.
• How do I handle the power sequencing and reset requirements of the SN74AS890GB?
  The SN74AS890GB requires a specific power sequencing and reset protocol to ensure proper operation. Ensure that the power supply (VCC) is stable and within the recommended range before applying the clock signal. Also, assert the reset signal (RESET) low for at least 10 ns to ensure a clean reset.