SNAS855D November   2023  – June 2024 LMKDB1108 , LMKDB1120 , LMKDB1204

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 Electrical Characteristics
    6. 6.6 SMBus Timing Requirements
    7. 6.7 SBI Timing Requirements
    8. 6.8 Timing Diagrams
    9. 6.9 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 Input Features
        1. 8.3.1.1 Running Input Clocks When Device is Powered Off
        2. 8.3.1.2 Fail-Safe Inputs
        3. 8.3.1.3 Input Configurations
          1. 8.3.1.3.1 Internal Termination for Clock Inputs
          2. 8.3.1.3.2 AC-Coupled or DC-Coupled Clock Inputs
      2. 8.3.2 Flexible Power Sequence
        1. 8.3.2.1 PWRDN# Assertion and Deassertion
        2. 8.3.2.2 OE# Assertion and Deassertion
        3. 8.3.2.3 PWRGD Assertion
        4. 8.3.2.4 Clock Input and PWRGD/PWRDN# Behaviors When Device Power is Off
      3. 8.3.3 LOS and OE
        1. 8.3.3.1 Additional OE# Pins for LMKDB1120 and Backward Compatibility
        2. 8.3.3.2 Synchronous OE
        3. 8.3.3.3 OE Control
        4. 8.3.3.4 Automatic Output Disable
        5. 8.3.3.5 LOS Detection
      4. 8.3.4 Output Features
        1. 8.3.4.1 Output Banks
        2. 8.3.4.2 Double Termination
        3. 8.3.4.3 Programmable Output Slew Rate
          1. 8.3.4.3.1 Slew Rate Control through Pin
          2. 8.3.4.3.2 Slew Rate Control through SMBus
        4. 8.3.4.4 Programmable Output Swing
        5. 8.3.4.5 Accurate Output Impedance
        6. 8.3.4.6 Programmable Output Impedance
    4. 8.4 Device Functional Modes
      1. 8.4.1 SMBus Mode
      2. 8.4.2 SBI Mode
      3. 8.4.3 Pin Mode
  10. 9 Register Maps
    1. 9.1 LMKDB1120 Registers
    2. 9.2 LMKDB1108 Registers
    3. 9.3 LMKDB1104 Registers
    4. 9.4 LMKDB1204 Registers
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.4.2 SBI Mode

Side-Band Interface (SBI) is a simple 3-wire or 4-wire serial interface which consists of SHFT_LD#, SBI_IN, SBI_CLK and SBI_OUT (optional) pins. When the SHFT_LD# pin is high, the rising edge of SBI_CLK clocks SBI_IN into a shift register. After shifting data, the falling edge of SHFT_LD# loads the shift register contents into the output register. SBI registers can be shifted out through SBI_OUT pin to form daisy chain topology.

Enabling SBI mode does not disable SMBus. SBI registers can be accessed while PWRGD/PWRDN# pin is low.

LMKDB12xx only supports pin mode and SMBus mode.

LMKDB1102 LMKDB1202 LMKDB1104 LMKDB1204 LMKDB1108 LMKDB1120 SBI Control Logic Figure 8-12 SBI Control Logic
LMKDB1102 LMKDB1202 LMKDB1104 LMKDB1204 LMKDB1108 LMKDB1120 SBI Star Topology Figure 8-13 SBI Star Topology
LMKDB1102 LMKDB1202 LMKDB1104 LMKDB1204 LMKDB1108 LMKDB1120 SBI Daisy Chain Topology Figure 8-14 SBI Daisy Chain Topology

SBI register sequence:

  • LMKDB1120: SBI_IN – CLK0, CLK1, CLK2, CLK3, CLK4, CLK5, CLK6, CLK7, CLK8, CLK9, CLK10, CLK11, CLK12, CLK13, CLK14, CLK15, CLK16, CLK17, CLK18, CLK19 – SBI_OUT
  • LMKDB1108: SBI_IN – CLK7, CLK6, CLK5, CLK4, CLK3, CLK2, CLK1, CLK0 – SBI_OUT
  • LMKDB1104: SBI_IN – CLK3, CLK2, CLK1, CLK0 – SBI_OUT