SCEA135 june   2023 TXB0101 , TXB0102 , TXB0104 , TXB0104-Q1 , TXB0106 , TXB0106-Q1 , TXB0108 , TXB0302 , TXB0304 , TXS0101 , TXS0102 , TXS0102-Q1 , TXS0104E , TXS0104E-Q1 , TXS0108E , TXS0108E-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2The One-shot's Designed Duration
    1. 2.1 Design Considerations
    2. 2.2 Recommended Parts
  6. 3Design Considerations for Slow Rise and Fall Times
    1. 3.1 Design Considerations
    2. 3.2 Recommended Parts
  7. 4Consider the Impact of External RC Components on Rise and Fall Times
    1. 4.1 Design Considerations
    2. 4.2 Recommended Parts
  8. 5Consider the Lumped Capacitance
    1. 5.1 Design Considerations
    2. 5.2 Recommended Parts
  9. 6Consider the Effects of Temperature on the Output Impedance
    1.     Design Considerations
  10. 7Summary
  11. 8References

Design Considerations

  • Minimize reflections / ringing.
  • Consider the impact of temperature on the output impedance, as mismatched impedance with PCB traces yield reflections.
  • Reflections or ringing can be amplified by the one-shot as false edge triggers.
  • Excessive ringing can cause false triggers observed as oscillating outputs.
  • Ringing is also caused by capacitance and inductance of long cables or traces and can be amplified by unstable GND or VCC voltages.
  • Use bypass capacitors or stable GND to minimize noise.
  • Devices with Schmitt – Trigger are most recommended for noisy applications. See Section 3.2 for recommendations.
  • Need additional assistance? Ask our engineers a question on the TI E2E™ Logic Support Forum