SCES586E July   2004  – March 2024 SN74LVC1G123

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics
    6. 5.6  Timing Requirements
    7. 5.7  Switching Characteristics, CL = 15 pF, –40°C to 85°C
    8. 5.8  Switching Characteristics, CL = 50 pF, –40°C to 85°C
    9. 5.9  Switching Characteristics, CL = 50 pF, –40°C to 125°C
    10. 5.10 Operating Characteristics
    11. 5.11 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.2.2 Detailed Design Procedure

The values for VCC, RPU, R, and C must be selected for proper operation.

VCC is selected at 1.8 V. This value is usually driven by the logic voltage of the system, but is arbitrary in this case.

RPU is selected at 10 kΩ.

R and C are selected via the plots in Section 8.2.3 and are based on the time desired for the output pulse. In this case, the output pulse will be 1 ms. Since the supply voltage has been selected at 1.8 V, Figure 8-2 is used to determine the R and C values required. First convert the desired pulse width (tw), 1 ms, to ns. This yields 106 ns. Next follow that line across to see which R and C values intersect it.

R is selected at 10 kΩ because that line intersects nicely with 106 ns and 105 pF, making the selection of C at 0.1 µF easy.

Table 8-1 Application Specific Values
PARAMETERVALUE
VCC1.8 V
RPU10 kΩ
tw1 ms
R (Rext)10 kΩ
C (Cext)0.1 µF

In addition to the shown components, a 0.1-µF decoupling capacitor from VCC to ground should be placed as close as possible to the device.