SNAA377 December   2025 LMK05318 , LMK05318B , LMK5B12204 , LMK5B12212 , LMK5B33216 , LMK5B33414 , LMK5C22212A , LMK5C23208A , LMK5C33216 , LMK5C33216A , LMK5C33414A

 

  1.   1
  2.   Trademarks
  3.   Abstract
  4. 1Introduction
  5. 2General Termination Guidelines
    1. 2.1 Identify the Driver and Receiver Requirements
    2. 2.2 Determine the Coupling Type
      1. 2.2.1 DC-Coupled Signal
      2. 2.2.2 AC-Coupled Signal
  6. 3Differential
    1. 3.1 Setting the Common-Mode Voltage (Thevenin Termination)
    2. 3.2 LVPECL
      1. 3.2.1 DC-Coupled LVPECL
      2. 3.2.2 AC-Coupled LVPECL
    3. 3.3 LVDS
      1. 3.3.1 DC-Coupled LVDS
      2. 3.3.2 AC-Coupled LVDS
    4. 3.4 HSDS
      1. 3.4.1 DC-Coupled HSDS
      2. 3.4.2 AC-Coupled HSDS
    5. 3.5 HCSL
      1. 3.5.1 DC-Coupled HCSL
      2. 3.5.2 AC-Coupled HCSL
    6. 3.6 LP-HCSL
      1. 3.6.1 DC-Coupled LP-HCSL
      2. 3.6.2 AC-Coupled LP-HCSL
  7. 4Single-Ended
    1. 4.1 LVCMOS
      1. 4.1.1 DC-Coupled LVCMOS (Series Termination)
      2. 4.1.2 AC-Coupled LVCMOS (Series Termination)
    2. 4.2 Differential P or N
      1. 4.2.1 DC-Coupled Differential P or N
  8. 5Summary
  9. 6References

1 Introduction

Table 1-1 lists the definition for each abbreviation and/or key terminology used in the document.

Table 1-1 Terminology Used Throughout Application Note
TERM DEFINITION
LVPECL Low Voltage Positive Emitter Coupled Logic
LVDS Low Voltage Differential Signaling
HCSL High Speed Current Steering Logic
LP-HCSL Low Power High Speed Current Steering Logic
LVCMOS Low Voltage Complementary Metal Oxide Semiconductor
P and N Complimentary pair of a differential signal. P is the non-inverted signal and N is the inverted signal.
Single-ended One input or output signal (such as LVCMOS)
Differential A pair of "P" and "N" input or output signals (such as LVPECL)
PCB Printed circuit board
ZO Transmission line impedance, characteristic impedance, PCB trace impedance(1)
VCM Common-mode voltage, where VCM = (P + N) /2, the average of the P and N signal
VIH Input high voltage level
VIL Input low voltage level
VOH Ouput high voltage level
VOL Output low voltage level
VID Single-ended input voltage swing level (amplitude), where VID = VIH − VIL
VOD Single-ended output voltage swing level (amplitude), where VOD = VOH −VOL
VPP Differential peak-to-peak voltage, where VPP = 2 × VID or 2 × VOD
VDD or VCC Supply voltage
IBIS Input/Output Buffer Information Specification
(1) This application note uses the impedance value of 50-ohms for single-ended traces and 100-ohms for differential in the examples.