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LMKDB1108FS Scheda tecnica(PDF) 39 Page - Texas Instruments |
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LMKDB1108FS Scheda tecnica(HTML) 39 Page - Texas Instruments |
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39 / 126 page  8.3.4.4 Accurate Output Impedance The LMKDB family supports both 100Ω LP-HCSL and 85Ω LP-HCSL. The output impedance is accurately trimmed to ±5%. This helps improve impedance matching and clock signal integrity. 8.3.4.5 Programmable Output Impedance The LMKDB1102 offers pin mode option to select 100Ω or 85Ω LP-HCSL output impedance provides flexibility in design. Output impedance can be selected using ZOUT_SEL pin on the device as shown in Table 8-6. If left floating, 85Ω output impedance is selected by default through an internal pulldown resistor. Table 8-6. Programmable Output Impedance ZOUT_SEL Output Impedance Low 85Ω High 100Ω 8.3.4.6 Fail-Safe Outputs LMKDB110x with suffix "FS" devices as listed in Device Comparison have fail-safe outputs. Fail-safe means outputs can be driven to VDD when device power is off without causing any leakage or reliability problem. This feature provides additional flexibility in design for clock output routing on FLEXIO pins in the system. 8.4 Device Functional Modes 8.4.1 SMBus Mode In SMBus mode, LMKDB11xx device SMBus registers can be written and read through SMBus pins. Pin SADR1 and SADR0 set the SMBus address. SADR1 SADR0 8-Bit SMBus Address (R/W Bit = 0) Low Low 0xD8 Low Float 0xDA Low High 0xDE Float Low 0xC2 Float Float 0xC4 Float High 0xC6 High Low 0xCA High Float 0xCC High High 0xCE Table 8-7. Command Code Definition BIT DESCRIPTION 7 0 = Block Read or Block Write operation 1 = Byte Read or Byte Write operation (6:0) Register address for Byte operations, or starting register address for Block, operations www.ti.com LMKDB1102, LMKDB1104, LMKDB1104FS LMKDB1108, LMKDB1108FS, LMKDB1112, LMKDB1120, LMKDB1120FS SNAS855F – NOVEMBER 2023 – REVISED NOVEMBER 2025 Copyright © 2025 Texas Instruments Incorporated Submit Document Feedback 39 Product Folder Links: LMKDB1102 LMKDB1104 LMKDB1104FS LMKDB1108 LMKDB1108FS LMKDB1112 LMKDB1120 LMKDB1120FS |
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