SNAS822C September   2021  – February 2026 LMK1D2102 , LMK1D2104

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Fail-Safe Inputs
    4. 8.4 Device Functional Modes
      1. 8.4.1 LVDS Output Termination
      2. 8.4.2 Input Termination
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

3 Description

The LMK1D210x clock buffer distributes two clock inputs (IN0 and IN1) to a total of up to 8 pairs of differential LVDS clock outputs (OUT0, OUT7) with minimum skew for clock distribution. Each buffer block consists of one input and up to 4 LVDS outputs. The inputs can either be LVDS, LVPECL, HCSL, CML or LVCMOS.

The LMK1D210x is specifically designed for driving 50Ω transmission lines. In case of driving the inputs in single-ended mode, the appropriate bias voltage as shown in 1.8V, 2.5V, 3.3V LVCMOS Clock Driver Connected to LMK1D210x Input must be applied to the unused negative input pin.

Using the control pin (EN), output banks can either be enabled or disabled. If this pin is left open, two buffers with all outputs are enabled, if switched to a logic "0", both banks with all outputs are disabled (static logic "0"), if switched to a logic "1", one bank and the outputs are disabled while another bank with the outputs are enabled. The part supports a fail-safe function. The device further incorporates an input hysteresis which prevents random oscillation of the outputs in the absence of an input signal.

The device operates in 1.8V or 2.5V or 3.3V supply environment and is characterized from –40°C to 105°C (ambient temperature). The LMK1D210x package variant is shown in the table below:

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
LMK1D2102 RGT (VQFN, 16) 3.00mm × 3.00mm
LMK1D2104 RHD (VQFN, 28) 5.00mm × 5.00mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LMK1D2102 LMK1D2104 Application Example Application Example