SNAS834 November   2024 LMK5C22212A

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Diagrams
    7. 5.7 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Differential Voltage Measurement Terminology
    2. 6.2 Output Clock Test Configurations
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
      1. 7.2.1 PLL Architecture Overview
      2. 7.2.2 DPLL
        1. 7.2.2.1 Independent DPLL Operation
        2. 7.2.2.2 Cascaded DPLL Operation
        3. 7.2.2.3 APLL Cascaded With DPLL
      3. 7.2.3 APLL-Only Mode
    3. 7.3 Feature Description
      1. 7.3.1  Oscillator Input (XO)
      2. 7.3.2  Reference Inputs
      3. 7.3.3  Clock Input Interfacing and Termination
      4. 7.3.4  Reference Input Mux Selection
        1. 7.3.4.1 Automatic Input Selection
        2. 7.3.4.2 Manual Input Selection
      5. 7.3.5  Hitless Switching
        1. 7.3.5.1 Hitless Switching With Phase Cancellation
        2. 7.3.5.2 Hitless Switching With Phase Slew Control
      6. 7.3.6  Gapped Clock Support on Reference Inputs
      7. 7.3.7  Input Clock and PLL Monitoring, Status, and Interrupts
        1. 7.3.7.1 XO Input Monitoring
        2. 7.3.7.2 Reference Input Monitoring
          1. 7.3.7.2.1 Reference Validation Timer
          2. 7.3.7.2.2 Frequency Monitoring
          3. 7.3.7.2.3 Missing Pulse Monitor (Late Detect)
          4. 7.3.7.2.4 Runt Pulse Monitor (Early Detect)
          5. 7.3.7.2.5 Phase Valid Monitor for 1-PPS Inputs
        3. 7.3.7.3 PLL Lock Detectors
        4. 7.3.7.4 Tuning Word History
        5. 7.3.7.5 Status Outputs
        6. 7.3.7.6 Interrupt
      8. 7.3.8  PLL Relationships
        1. 7.3.8.1  PLL Frequency Relationships
          1. 7.3.8.1.1 APLL Phase Frequency Detector (PFD) and Charge Pump
          2. 7.3.8.1.2 APLL VCO Frequency
          3. 7.3.8.1.3 DPLL TDC Frequency
          4. 7.3.8.1.4 DPLL VCO Frequency
          5. 7.3.8.1.5 Clock Output Frequency
        2. 7.3.8.2  Analog PLLs (APLL1, APLL2)
        3. 7.3.8.3  APLL Reference Paths
          1. 7.3.8.3.1 APLL XO Doubler
          2. 7.3.8.3.2 APLL XO Reference (R) Divider
        4. 7.3.8.4  APLL Feedback Divider Paths
          1. 7.3.8.4.1 APLL N Divider With Sigma-Delta Modulator (SDM)
        5. 7.3.8.5  APLL Loop Filters (LF1, LF2)
        6. 7.3.8.6  APLL Voltage-Controlled Oscillators (VCO1, VCO2)
          1. 7.3.8.6.1 VCO Calibration
        7. 7.3.8.7  APLL VCO Clock Distribution Paths
        8. 7.3.8.8  DPLL Reference (R) Divider Paths
        9. 7.3.8.9  DPLL Time-to-Digital Converter (TDC)
        10. 7.3.8.10 DPLL Loop Filter (DLF)
        11. 7.3.8.11 DPLL Feedback (FB) Divider Path
      9. 7.3.9  Output Clock Distribution
      10. 7.3.10 Output Source Muxes
      11. 7.3.11 Output Channel Muxes
      12. 7.3.12 Output Dividers (OD)
      13. 7.3.13 Output Delay
      14. 7.3.14 Clock Outputs
        1. 7.3.14.1 Differential Output
        2. 7.3.14.2 LVCMOS Output
        3. 7.3.14.3 SYSREF/1PPS Output
      15. 7.3.15 Output Auto-Mute During LOL
      16. 7.3.16 Glitchless Output Clock Start-Up
      17. 7.3.17 Clock Output Interfacing and Termination
      18. 7.3.18 Output Synchronization (SYNC)
      19. 7.3.19 Zero-Delay Mode (ZDM)
      20. 7.3.20 DPLL Programmable Phase Delay
      21. 7.3.21 Time Elapsed Counter (TEC)
        1. 7.3.21.1 Configuring TEC Functionality
        2. 7.3.21.2 SPI as a Trigger Source
        3. 7.3.21.3 GPIO Pin as a TEC Trigger Source
          1. 7.3.21.3.1 An Example: Making a Time Elapsed Measurement Using TEC and GPIO1 as Trigger
        4. 7.3.21.4 Other TEC Behavior
    4. 7.4 Device Functional Modes
      1. 7.4.1 DPLL Operating States
        1. 7.4.1.1 Free-Run
        2. 7.4.1.2 Lock Acquisition
        3. 7.4.1.3 DPLL Locked
        4. 7.4.1.4 Holdover
      2. 7.4.2 Digitally-Controlled Oscillator (DCO) Frequency and Phase Adjustment
        1. 7.4.2.1 DPLL DCO Control
        2. 7.4.2.2 DPLL DCO Relative Adjustment Frequency Step Size
        3. 7.4.2.3 APLL DCO Frequency Step Size
      3. 7.4.3 APLL Frequency Control
      4. 7.4.4 Device Start-Up
        1. 7.4.4.1 Device Power-On Reset (POR)
        2. 7.4.4.2 PLL Start-Up Sequence
        3. 7.4.4.3 Start-Up Options for Register Configuration
        4. 7.4.4.4 GPIO1 and SCS_ADD Functionalities
        5. 7.4.4.5 ROM Page Selection
        6. 7.4.4.6 EEPROM Overlay
      5. 7.4.5 Programming
        1. 7.4.5.1 Memory Overview
        2. 7.4.5.2 Interface and Control
          1. 7.4.5.2.1 Programming Through TICS Pro
          2. 7.4.5.2.2 SPI Serial Interface
          3. 7.4.5.2.3 I2C Serial Interface
        3. 7.4.5.3 General Register Programming Sequence
        4. 7.4.5.4 Steps to Program the EEPROM
          1. 7.4.5.4.1 Overview of the SRAM Programming Methods
          2. 7.4.5.4.2 EEPROM Programming With the Register Commit Method
          3. 7.4.5.4.3 EEPROM Programming With the Direct Writes Method or Mixed Method
          4. 7.4.5.4.4 Five MSBs of the I2C Address and the EEPROM Revision Number
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Device Start-Up Sequence
      2. 8.1.2 Power Down (PD#) Pin
      3. 8.1.3 Strap Pins for Start-Up
      4. 8.1.4 Pin States
      5. 8.1.5 ROM and EEPROM
      6. 8.1.6 Power Rail Sequencing, Power Supply Ramp Rate, and Mixing Supply Domains
        1. 8.1.6.1 Power-On Reset (POR) Circuit
        2. 8.1.6.2 Power Up From a Single-Supply Rail
        3. 8.1.6.3 Power Up From Split-Supply Rails
        4. 8.1.6.4 Non-Monotonic or Slow Power-Up Supply Ramp
      7. 8.1.7 Slow or Delayed XO Start-Up
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
      1. 8.4.1 Power Supply Bypassing
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
      3. 8.5.3 Thermal Reliability
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Glossary
    6. 9.6 Electrostatic Discharge Caution
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.7.6 Interrupt

Any GPIO pin can be configured as a device interrupt output pin. The interrupt logic configuration is set through registers. When the interrupt logic is enabled, the interrupt output can be triggered from any combination of interrupt status indicators, including LOS for the XO, LOR for the selected DPLL input, LOL for APLL1, APLL2, and the DPLLs, and holdover and switchover events for the DPLLs. When the interrupt polarity is set high, a rising edge on the live status bit asserts the interrupt flag (sticky bit). Otherwise, when the polarity is set low, a falling edge on the live status bit asserts the interrupt flag. Any individual interrupt flag can be masked so the flag does not trigger the interrupt output. The unmasked interrupt flags are combined by the AND/OR gate to generate the interrupt output, which can be selected on either status pin.

When a system host detects an interrupt from the device, the host can read the interrupt flag or sticky registers to identify which bits are asserted to resolve the fault conditions in the system. After the system faults have been resolved, the host can clear the interrupt output by writing 1 to the self-clearing INT_CLR field.

LMK5C22212A Status and InterruptFigure 7-22 Status and Interrupt