SCDA008C June   2021  – November 2021 CD4052B , TS3A225E , TS3A44159

 

  1.   Trademarks
  2. 1Introduction
  3. 2Semiconductor Switches
    1. 2.1 NMOS Switch
    2. 2.2 PMOS Switch
  4. 3Basic Signal-Switch Structures
    1. 3.1 NMOS Series Switch
    2. 3.2 NMOS/PMOS Parallel Switch
    3. 3.3 NMOS Series Switch with the Charge Pump
  5. 4Key Concerns in Digital-Switch Applications
    1. 4.1  Power and Control Voltage Requirements
    2. 4.2  Rail-to-Rail Operation
    3. 4.3  Undershoot
    4. 4.4  ron
    5. 4.5  Cio(off)
    6. 4.6  Cio(on)
    7. 4.7  Ci (Control Input Capacitance)
    8. 4.8  Leakage Current
    9. 4.9  Enable and Disable Delays and Propagation Delay
    10. 4.10 Partial Power Down
    11. 4.11 Voltage Translation
  6. 5Signal Switch Families
    1. 5.1 CBT-C Family
      1. 5.1.1 Characteristics of CBT-C Family
        1. 5.1.1.1 VOvs VI
        2. 5.1.1.2 ron vs VI
        3. 5.1.1.3 Undershoot Protection
      2. 5.1.2 Application of CBT-C Family
        1. 5.1.2.1 Bus Isolation
    2. 5.2 CBTLV Family
      1. 5.2.1 Characteristics of the CBTLV Family
    3. 5.3 CB3Q Family
      1. 5.3.1 Characteristics of the CB3Q Family
        1. 5.3.1.1 VOvs VI
        2. 5.3.1.2 ron vs VI
        3. 5.3.1.3 Operation at High Frequency
        4. 5.3.1.4 Output Skew
        5. 5.3.1.5 Frequency Response
        6. 5.3.1.6 Adjacent Channel Crosstalk
      2. 5.3.2 Application of the CB3Q Family
        1. 5.3.2.1 Multiplexer in USB Applications
    4. 5.4 CB3T Family
      1. 5.4.1 Characteristics of the CB3T Family
        1. 5.4.1.1 VO vs VI
        2. 5.4.1.2 ron vs VI
        3. 5.4.1.3 Operation at High Frequency
      2. 5.4.2 Application of the CB3T Family
        1. 5.4.2.1 Voltage Translation for an External Monitor Terminal in a Notebook PC
  7. 6Applications
    1. 6.1 Multiplexing USB Peripherals
    2. 6.2 Multiplexing Ethernet
    3. 6.3 Notebook Docking Station
  8. 7Conclusion
  9. 8References
  10. 9Revision History
  11.   A Test Measurement Circuits
    1.     A.1 Measurement Setup for ron
    2.     A.2 Measurement Setup for VO vs VI Characteristics
    3.     A.3 Voltage-Time Waveform Measurement (Switch On)
    4.     A.4 Voltage-Time Waveform Measurement (Switch Off)
    5.     A.5 Output-Skew Measurement
    6.     A.6 Simulation Setup for Undershoot Measurement
    7.     A.7 Laboratory Setup for Attenuation Measurement
    8.     A.8 Laboratory Setup for Off Isolation Measurement
    9.     A.9 Laboratory Setup for Crosstalk Measurement

5.2.1 Characteristics of the CBTLV Family

Figure 5-7 shows the VO vs. VI characteristics of the SN74CBTLV3125 and the ron flatness for VCC = 2.5 V. The output voltage exactly follows the input across the input signal range from 0 V to VCC.

GUID-B9D88131-6316-4898-A42F-814F6E253701-low.gif Figure 5-7 VO vs. VI, VCC = 2.5 V (SN74CBTLV3125)

The architecture of the CBTLV switch results in an on-resistance as low as 5 Ω. Figure 5-8 shows measurements of the on-resistance across the signal range and at different temperatures.

GUID-B86FB740-6086-4D0E-98D4-CAA239ED41F7-low.gif Figure 5-8 ron vs. VI, VCC = 2.5 V (SN74CBTLV3125)