SLCA006 June   2025 LM339 , LM393 , LMH7322 , TL331 , TLV1812 , TLV1871 , TLV1872 , TLV3601 , TLV3604

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Output Types
    1. 2.1 Open Collector or Open Drain
      1. 2.1.1 Selectable Open Collector or Open Emitter Output
    2. 2.2 Push-Pull
      1. 2.2.1 Push-Pull with Separate Supplies
    3. 2.3 Differential
      1. 2.3.1 Differential Push Pull
      2. 2.3.2 ECL, RSECL, PECL, RSPECL, and LVPECL
      3. 2.3.3 Low Voltage Differential Signaling
      4. 2.3.4 Current Mode Logic
  6. 3Summary
  7. 4References

2.3.1 Differential Push Pull

The differential push-pull out is a comparator with two identical Push-Pull outputs, where one output is inverted 180° from the other and swing close to the supply rails. Because the inversion is done internally from a common node, there is minimal skewing (delay) between the two outputs that can be caused by using an external inverter logic gate.

Differential Push-Pull OutputFigure 2-9 Differential Push-Pull Output

The differential outputs can be used to create a differential transmission scheme, or, as two single outputs 180° apart to drive loads such as H bridge transistors or MOSFETs.

Devices that support this standard are the TL3016, TL3116, TL712 and TL714.

Table 2-5 Advantages and Disadvantages of Differential Push-Pull Outputs
AdvantagesDisadvantages
  • Outputs can sink and source current
  • No Pull-up resistor required - saves power
  • Symmetrical rise and fall times
  • Allows for differential signaling
  • Outputs cannot be tied together
  • Output voltage swing is the same as the supply voltage
  • Large output swing can cause EMI