SNAS605AS March   2013  – May 2020 LMK04821 , LMK04826 , LMK04828

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Schematic
  4. 4 Revision History
  5. 5 Device Comparison Table
    1. 5.1 Device Configuration Information
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 SPI Interface Timing
    7. 7.7 Typical Characteristics – Clock Output AC Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Charge Pump Current Specification Definitions
      1. 8.1.1 Charge Pump Output Current Magnitude Variation Vs. Charge Pump Output Voltage
      2. 8.1.2 Charge Pump Sink Current Vs. Charge Pump Output Source Current Mismatch
      3. 8.1.3 Charge Pump Output Current Magnitude Variation Vs. Ambient Temperature
    2. 8.2 Differential Voltage Measurement Terminology
  9. 9 Detailed Description
    1. 9.1 Overview
      1. 9.1.1  Jitter Cleaning
      2. 9.1.2  JEDEC JESD204B Support
      3. 9.1.3  Three PLL1 Redundant Reference Inputs
      4. 9.1.4  VCXO/Crystal Buffered Output
      5. 9.1.5  Frequency Holdover
      6. 9.1.6  PLL2 Integrated Loop Filter Poles
      7. 9.1.7  Internal VCOs
        1. 9.1.7.1 VCO1 Divider (LMK04821 only)
      8. 9.1.8  External VCO Mode
      9. 9.1.9  Clock Distribution
        1. 9.1.9.1 Device Clock Divider
        2. 9.1.9.2 SYSREF Clock Divider
        3. 9.1.9.3 Device Clock Delay
        4. 9.1.9.4 SYSREF Delay
        5. 9.1.9.5 Glitchless Half Step and Glitchless Analog Delay
        6. 9.1.9.6 Programmable Output Formats
        7. 9.1.9.7 Clock Output Synchronization
      10. 9.1.10 Zero-Delay
      11. 9.1.11 Status Pins
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 SYNC/SYSREF
      2. 9.3.2 JEDEC JESD204B
        1. 9.3.2.1 How To Enable SYSREF
          1. 9.3.2.1.1 Setup of SYSREF Example
          2. 9.3.2.1.2 SYSREF_CLR
        2. 9.3.2.2 SYSREF Modes
          1. 9.3.2.2.1 SYSREF Pulser
          2. 9.3.2.2.2 Continuous SYSREF
          3. 9.3.2.2.3 SYSREF Request
      3. 9.3.3 Digital Delay
        1. 9.3.3.1 Fixed Digital Delay
          1. 9.3.3.1.1 Fixed Digital Delay Example
        2. 9.3.3.2 Dynamic Digital Delay
        3. 9.3.3.3 Single and Multiple Dynamic Digital Delay Example
      4. 9.3.4 SYSREF to Device Clock Alignment
      5. 9.3.5 Input Clock Switching
        1. 9.3.5.1 Input Clock Switching - Manual Mode
        2. 9.3.5.2 Input Clock Switching - Pin Select Mode
        3. 9.3.5.3 Input Clock Switching - Automatic Mode
      6. 9.3.6 Digital Lock Detect
      7. 9.3.7 Holdover
        1. 9.3.7.1 Enable Holdover
          1. 9.3.7.1.1 Fixed (Manual) CPout1 Holdover Mode
          2. 9.3.7.1.2 Tracked CPout1 Holdover Mode
        2. 9.3.7.2 Entering Holdover
        3. 9.3.7.3 During Holdover
        4. 9.3.7.4 Exiting Holdover
        5. 9.3.7.5 Holdover Frequency Accuracy and DAC Performance
        6. 9.3.7.6 Holdover Mode - Automatic Exit of Holdover
    4. 9.4 Device Functional Modes
      1. 9.4.1 Dual PLL
      2. 9.4.2 Zero-Delay Dual PLL
      3. 9.4.3 Single-Loop Mode
      4. 9.4.4 Single-Loop Mode With External VCO
      5. 9.4.5 Distribution Mode
    5. 9.5 Programming
      1. 9.5.1 Recommended Programming Sequence
        1. 9.5.1.1 SPI LOCK
        2. 9.5.1.2 SYSREF_CLR
        3. 9.5.1.3 RESET Pin
    6. 9.6 Register Maps
      1. 9.6.1 Register Map for Device Programming
    7. 9.7 Device Register Descriptions
      1. 9.7.1 System Functions
        1. 9.7.1.1 RESET, SPI_3WIRE_DIS
        2. 9.7.1.2 POWERDOWN
        3. 9.7.1.3 ID_DEVICE_TYPE
        4. 9.7.1.4 ID_PROD[15:8], ID_PROD
        5. 9.7.1.5 ID_MASKREV
        6. 9.7.1.6 ID_VNDR[15:8], ID_VNDR
      2. 9.7.2 (0x100 - 0x138) Device Clock and SYSREF Clock Output Controls
        1. 9.7.2.1 CLKoutX_Y_ODL, CLKoutX_Y_IDL, DCLKoutX_DIV
        2. 9.7.2.2 DCLKoutX_DDLY_CNTH, DCLKoutX_DDLY_CNTL
        3. 9.7.2.3 DCLKoutX_ADLY, DCLKoutX_ADLY_MUX, DCLKout_MUX
        4. 9.7.2.4 DCLKoutX_HS, SDCLKoutY_MUX, SDCLKoutY_DDLY, SDCLKoutY_HS
        5. 9.7.2.5 SDCLKoutY_ADLY_EN, SDCLKoutY_ADLY
        6. 9.7.2.6 DCLKoutX_DDLY_PD, DCLKoutX_HSg_PD, DCLKout_ADLYg_PD, DCLKout_ADLY_PD, DCLKoutX_Y_PD, SDCLKoutY_DIS_MODE, SDCLKoutY_PD
        7. 9.7.2.7 SDCLKoutY_POL, SDCLKoutY_FMT, DCLKoutX_POL, DCLKoutX_FMT
      3. 9.7.3 SYSREF, SYNC, and Device Config
        1. 9.7.3.1  VCO_MUX, OSCout_MUX, OSCout_FMT
        2. 9.7.3.2  SYSREF_CLKin0_MUX, SYSREF_MUX
        3. 9.7.3.3  SYSREF_DIV[12:8], SYSREF_DIV[7:0]
        4. 9.7.3.4  SYSREF_DDLY[12:8], SYSREF_DDLY[7:0]
        5. 9.7.3.5  SYSREF_PULSE_CNT
        6. 9.7.3.6  PLL2_NCLK_MUX, PLL1_NCLK_MUX, FB_MUX, FB_MUX_EN
        7. 9.7.3.7  PLL1_PD, VCO_LDO_PD, VCO_PD, OSCin_PD, SYSREF_GBL_PD, SYSREF_PD, SYSREF_DDLY_PD, SYSREF_PLSR_PD
        8. 9.7.3.8  DDLYdSYSREF_EN, DDLYdX_EN
        9. 9.7.3.9  DDLYd_STEP_CNT
        10. 9.7.3.10 SYSREF_CLR, SYNC_1SHOT_EN, SYNC_POL, SYNC_EN, SYNC_PLL2_DLD, SYNC_PLL1_DLD, SYNC_MODE
        11. 9.7.3.11 SYNC_DISSYSREF, SYNC_DISX
        12. 9.7.3.12 Fixed Registers (0x145, 0x171 - 0x172)
      4. 9.7.4 (0x146 - 0x149) CLKin Control
        1. 9.7.4.1 CLKin2_EN, CLKin1_EN, CLKin0_EN, CLKin2_TYPE, CLKin1_TYPE, CLKin0_TYPE
        2. 9.7.4.2 CLKin_SEL_POL, CLKin_SEL_MODE, CLKin1_OUT_MUX, CLKin0_OUT_MUX
        3. 9.7.4.3 CLKin_SEL0_MUX, CLKin_SEL0_TYPE
        4. 9.7.4.4 SDIO_RDBK_TYPE, CLKin_SEL1_MUX, CLKin_SEL1_TYPE
      5. 9.7.5 RESET_MUX, RESET_TYPE
      6. 9.7.6 (0x14B - 0x152) Holdover
        1. 9.7.6.1 LOS_TIMEOUT, LOS_EN, TRACK_EN, HOLDOVER_FORCE, MAN_DAC_EN, MAN_DAC[9:8]
        2. 9.7.6.2 MAN_DAC[9:8], MAN_DAC[7:0]
        3. 9.7.6.3 DAC_TRIP_LOW
        4. 9.7.6.4 DAC_CLK_MULT, DAC_TRIP_HIGH
        5. 9.7.6.5 DAC_CLK_CNTR
        6. 9.7.6.6 CLKin_OVERRIDE, HOLDOVER_PLL1_DET, HOLDOVER_LOS_DET, HOLDOVER_VTUNE_DET, HOLDOVER_HITLESS_SWITCH, HOLDOVER_EN
        7. 9.7.6.7 HOLDOVER_DLD_CNT[13:8], HOLDOVER_DLD_CNT[7:0]
      7. 9.7.7 (0x153 - 0x15F) PLL1 Configuration
        1. 9.7.7.1 CLKin0_R[13:8], CLKin0_R[7:0]
        2. 9.7.7.2 CLKin1_R[13:8], CLKin1_R[7:0]
        3. 9.7.7.3 CLKin2_R[13:8], CLKin2_R[7:0]
        4. 9.7.7.4 PLL1_N
        5. 9.7.7.5 PLL1_WND_SIZE, PLL1_CP_TRI, PLL1_CP_POL, PLL1_CP_GAIN
        6. 9.7.7.6 PLL1_DLD_CNT[13:8], PLL1_DLD_CNT[7:0]
        7. 9.7.7.7 PLL1_R_DLY, PLL1_N_DLY
        8. 9.7.7.8 PLL1_LD_MUX, PLL1_LD_TYPE
      8. 9.7.8 (0x160 - 0x16E) PLL2 Configuration
        1. 9.7.8.1 PLL2_R[11:8], PLL2_R[7:0]
        2. 9.7.8.2 PLL2_P, OSCin_FREQ, PLL2_XTAL_EN, PLL2_REF_2X_EN
        3. 9.7.8.3 PLL2_N_CAL
        4. 9.7.8.4 PLL2_FCAL_DIS, PLL2_N
        5. 9.7.8.5 PLL2_WND_SIZE, PLL2_CP_GAIN, PLL2_CP_POL, PLL2_CP_TRI
        6. 9.7.8.6 SYSREF_REQ_EN, PLL2_DLD_CNT
        7. 9.7.8.7 PLL2_LF_R4, PLL2_LF_R3
        8. 9.7.8.8 PLL2_LF_C4, PLL2_LF_C3
        9. 9.7.8.9 PLL2_LD_MUX, PLL2_LD_TYPE
      9. 9.7.9 (0x16F - 0x1FFF) Misc Registers
        1. 9.7.9.1  PLL2_PRE_PD, PLL2_PD
        2. 9.7.9.2  VCO1_DIV
        3. 9.7.9.3  OPT_REG_1
        4. 9.7.9.4  OPT_REG_2
        5. 9.7.9.5  RB_PLL1_LD_LOST, RB_PLL1_LD, CLR_PLL1_LD_LOST
        6. 9.7.9.6  RB_PLL2_LD_LOST, RB_PLL2_LD, CLR_PLL2_LD_LOST
        7. 9.7.9.7  RB_DAC_VALUE(MSB), RB_CLKinX_SEL, RB_CLKinX_LOS
        8. 9.7.9.8  RB_DAC_VALUE
        9. 9.7.9.9  RB_HOLDOVER
        10. 9.7.9.10 SPI_LOCK
  10. 10Applications and Implementation
    1. 10.1 Application Information
    2. 10.2 Digital Lock Detect Frequency Accuracy
      1. 10.2.1 Minimum Lock Time Calculation Example
    3. 10.3 Driving CLKin and OSCin Inputs
      1. 10.3.1 Driving CLKin and OSCin Pins With a Differential Source
      2. 10.3.2 Driving CLKin and OSCin Pins With a Single-Ended Source
    4. 10.4 Output Termination and Biasing
      1. 10.4.1 LVPECL
      2. 10.4.2 LVDS/HSDS
    5. 10.5 Typical Applications
      1. 10.5.1 Design Example
        1. 10.5.1.1 Design Requirements
        2. 10.5.1.2 Detailed Design Procedure
          1. 10.5.1.2.1 Device Configuration and Simulation - PLLatinum Sim
          2. 10.5.1.2.2 Device Programming
        3. 10.5.1.3 Application Curves
    6. 10.6 System Examples
      1. 10.6.1 System Level Diagram
    7. 10.7 Do's and Don'ts
  11. 11Power Supply Recommendations
    1. 11.1 Pin Connection Recommendations
      1. 11.1.1 VCC Pins and Decoupling
        1. 11.1.1.1 Clock Output Supplies
        2. 11.1.1.2 Low-Crosstalk Supplies
        3. 11.1.1.3 PLL2 Supplies
        4. 11.1.1.4 Clock Input Supplies
        5. 11.1.1.5 Unused Clock Inputs/Outputs
    2. 11.2 Current Consumption / Power Dissipation Calculations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Thermal Management
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Development Support
        1. 13.1.1.1 PLLatinum Sim
        2. 13.1.1.2 TICS Pro
    2. 13.2 Related Links
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

6 Pin Configuration and Functions

NKD Package
64-Pin WQFN
Top View
LMK04821 LMK04826 LMK04828 po_SNAS605.gif

Pin Functions

PIN I/O(1) DESCRIPTION(2)
NO. NAME
1 DCLKout0 O Device clock output 0. Differential clock output. Part of clock group 0. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
2 DCLKout0*
3 SDCLKout1 O SYSREF / Device clock output 1. Differential clock output. Part of clock group 0. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
4 SDCLKout1*
5 RESET/GPO I/O Device reset input or GPO. If used as a reset input, pin polarity and nominal 160-kΩ pull-up or pull-down are controlled by register settings. If used as an output, can be set to push-pull or open-drain.
6 SYNC/SYSREF_REQ I Synchronization input.. Can be used to reset dividers, trigger the SYSREF pulser, or request continuous SYSREF from the SYSREF divider. Pin polarity is controlled by register settings. Nominal 160-kΩ pulldown.
7, - NC Do not connect. These pins must be left floating.
8 - NC
9 - NC
10 Vcc1_VCO P Power supply for VCO LDO. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
11 LDObyp1 BP LDO bypass. This pin must be bypassed to ground with 10-µF capacitor placed close to the pin.
12 LDObyp2 BP LDO bypass.This pin must be bypassed to ground with a 0.1-µF capacitor placed close to the pin.
13, SDCLKout3 O SYSREF / Device clock output 3. Differential clock output. Part of clock group 1. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
14 SDCLKout3*
15 DCLKout2 O Device clock output 2. Differential clock output. Part of clock group 1. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
16 DCLKout2*
17 Vcc2_CG1 P Power supply for clock outputs 2 and 3. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
18 CS* I SPI Chip select. Active-low input. Must be pulled up externally or actively driven high when not in use.
19 SCK I SPI clock. Active-high input. Nominal 160-kΩ pulldown.
20 SDIO I/O SPI data. This pin can implement bidirectional I/O. As an output, this pin can be configured for open-drain or push-pull. Open-drain output requires external pull-up. Register settings can disable the output feature of this pin. Other GPIO pins can also be configured as SPI MISO (master-in slave-out) for traditional 4-wire SPI.
21 Vcc3_SYSREF P Power supply for SYSREF divider and SYNC. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
22 SDCLKout5 O SYSREF / Device clock output 5. Differential clock output. Part of clock group 2. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
23 SDCLKout5*
24 DCLKout4 O Device clock output 4. Differential clock output. Part of clock group 2. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
25 DCLKout4*
26 Vcc4_CG2 Power supply for clock outputs 4, 5, 6, and 7. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
27 DCLKout6 O Device clock output 6. Differential clock output. Part of clock group 2. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
28 DCLKout6*
29 SDCLKout7 O SYSREF / Device clock output 7. Differential clock output. Part of clock group 2. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
30 SDCLKout7*
31 Status_LD1 I/O Programmable status pin. By default, this pin is configured as an active-high output representing the state of PLL1 lock detect. Other status conditions and output polarity are register-selectable. This pin can be configured for open-drain or push-pull output.
32 CPout1 O Charge pump 1 output. This pin is connected to the external loop filter components for PLL1, and to the VCXO control voltage pin.
33 Vcc5_DIG P Power supply for digital circuitry, such as SPI bus and GPIO pins. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
34 CLKin1 I (Default) Reference clock input port 1 for PLL1. Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
FBCLKin I Feedback input for external clock feedback input (zero–delay mode). Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
Fin I External VCO input (external VCO mode) or Clock Distribution input (distribution mode). Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
35 CLKin1* I (Default) Reference clock input port 1 for PLL1. Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
FBCLKin* I Feedback input for external clock feedback input (zero-delay mode). Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
Fin* I External VCO input (external VCO mode) or Clock Distribution input (distribution mode). Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
36 Vcc6_PLL1 P Power supply for PLL1, charge pump 1, holdover DAC. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
37 CLKin0 I Reference clock input port 0 for PLL1. Can also be used as a synchronization input for SYNC/SYSREF. Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
38 CLKin0*
39 Vcc7_OSCout P Power supply for OSCout port and CLKin2. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
40 OSCout I/O (Default) Buffered output of OSCin port. Defaults to LVPECL. In LVPECL output format, this pin only supports 240-Ω emitter resistors. If unused, set output format buffer to powerdown and leave pins floating.
CLKin2 Reference clock input port 2 for PLL1. Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information. Registers must be configured to set this pin as an input.
41 OSCout* I/O (Default) Buffered output of OSCin port. Defaults to LVPECL. In LVPECL output format, this pin only supports 240-Ω emitter resistors. If unused, set output format buffer to powerdown and leave pins floating.
CLKin2* Reference clock input port 2 for PLL1. Can be configured for DC or AC coupling. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information. Registers must be configured to set this pin as an input.
42 Vcc8_OSCin P Power supply for OSCin. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
43 OSCin I Feedback to PLL1, reference input to PLL2. Inputs to this pin should be AC-coupled. Accepts single-ended or differential clocks. If unused in single-ended configuration, connect to GND with a 0.1-µF capacitor. Leave floating if both pins are unused. See Driving CLKin and OSCin Inputs for single-ended termination information.
44 OSCin*
45 Vcc9_CP2 P Power supply for PLL2 charge pump. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
46 CPout2 O Charge pump 2 output. This pin is connected to the external components of the PLL2 loop filter. If an external VCO is used, this pin is also connected to the external VCO control voltage pin. Do not route this pin near noisy signals.
47 Vcc10_PLL2 P Power supply for PLL2. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
48 Status_LD2 I/O Programmable status pin. By default, this pin is configured as an active-high output representing the state of PLL2 lock detect. Other status conditions and output polarity are register-selectable. This pin can be configured for open-drain or push-pull output.
49 SDCLKout9 O SYSREF / Device clock 9. Differential clock output. Part of clock group 3. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
50 SDCLKout9*
51 DCLKout8 O Device clock output 8. Differential clock output. Part of clock group 3. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
52 DCLKout8*
53 Vcc11_CG3 P Power supply for clock outputs 8, 9, 10, and 11. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
54 DCLKout10 O Device clock output 10. Differential clock output. Part of clock group 3. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
55 DCLKout10*
56 SDCLKout11 O SYSREF / Device clock output 11. Differential clock output. Part of clock group 3. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
57 SDCLKout11*
58 CLKin_SEL0 I/O Programmable status pin. By default this pin is programmed as an active-high input with nominal 160-kΩ pulldown that selects which CLKin is used as the reference to PLL1 in pin-select mode. If used as an input, pin polarity and nominal 160-kΩ pull-up or pull-down are controlled by register settings. If used as an output, can be set to push-pull or open-drain.
59 CLKin_SEL1 I/O Programmable status pin. By default this pin is programmed as an active-high input with nominal 160-kΩ pulldown that selects which CLKin is used as the reference to PLL1 in pin-select mode. If used as an input, pin polarity and nominal 160-kΩ pull-up or pull-down are controlled by register settings. If used as an output, can be set to push-pull or open-drain.
60 SDCLKout13 O SYSREF / Device clock output 13. Differential clock output. Part of clock group 0. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
61 SDCLKout13*
62 DCLKout12 O Device clock output 12. Differential clock output. Part of clock group 0. To minimize noise, keep all outputs in the clock group at the same frequency, or at frequencies without spurious interference. If unused, set output format buffer to powerdown and leave pins floating.
63 DCLKout12*
64 Vcc12_CG0 P Power supply for clock outputs 0, 1, 12, and 13. Decoupling capacitance requirements may change with system frequency. See Pin Connection Recommendations for recommendations.
- DAP G Die attach pad. Connect directly to GND plane through multiple vias to minimize resistive and inductive effects and to achieve good thermal performance. All power supply pins are referred to the DAP ground.
(1) The definitions below define the I/O type for each pin.
  • I = Input
  • O = Output
  • I/O = Input / Output (Configurable)
  • P = Power Supply
  • BP = Bypass (LDO output)
  • G = Ground
  • NC = No Connect
(2) See Pin Connection Recommendations for recommended connections.