IC-Mart Your Trusted Source for Clock Buffer Chips

(from leading manufacturers)

Top Clock Buffer Manufacturers and Core Products

1. Texas Instruments (TI)

• General Fanout: LMK1C11xx series (e.g., LMK1C1104, LMK1C1108; mostly LVCMOS).
• Ultra-Low Jitter/Differential: LMK003xx (e.g., LMK00304) and CDCLVP series (e.g., CDCLVP1212; LVPECL focus).
• Zero Delay (ZDB): CDCV304, CDCVF2310.
• PCIe Specific: LMKDB1208 (Supports PCIe Gen 1-6/7), LMK0033x.
• Automotive (Q1): Models with “-Q1” suffix, like LMK1C1106-Q1.

2. Renesas (formerly IDT)

• PCIe Specific (ZDB & Fanout): 9DBL, 9DBV, and 9DML series (e.g., 9DBL0452).
• High-Performance Differential: 8P34S series (e.g., 8P34S1208) with ultra-low additive jitter.
• Classic Zero Delay (ZDB): IDT2305, IDT2308, IDT2309 (Industry standards).
• Programmable/Universal: 5P49V59xx series.

3. Microchip (formerly Micrel & Microsemi)

• High-Speed Differential: SY89 (e.g., SY89833L) and SY100 series.
• Industrial/Telecom PCIe: SY7560x (e.g., SY75608) and ZL402 series (Low-power HCSL).
• High Reliability/Sync: ZL30 series for network synchronization.

4. Skyworks (formerly Silicon Labs)

• Universal Translation: Si5330x series (e.g., Si53301) accepts any input and converts to any output format.
• Low Jitter CMOS: Si5336x series.
• PCIe Specific: Si5320x (e.g., Si53212) and Si531x (Zero Delay PCIe).
• Next-Gen: SKY535x series.

5. Diodes Incorporated (formerly Pericom)

• PCIe Gen 4/5/6: PI6CB (e.g., PI6CB18401) and PI6CG series.
• Ultra-High Speed: PI6C59 series (up to 6GHz, e.g., PI6C5946004).
• General Level Translation: PI6C49 series.

6. Analog Devices (ADI / formerly Maxim)

• Precision Clock Distribution: HMC7043, HMC7044 (JESD204B support with delay adjustment).
• Low Jitter: AD952x series (integrated Generator + Buffer).
• Maxim Differential: MAX93xx series (e.g., MAX9315).

7. onsemi

• High-Performance Logic: NB6L and NB7L series.
• General Logic: 74AC and 74VHC series (Simple CMOS drive).

Quick Selection Guide

Scenario	Recommended Manufacturers	Typical Series Prefix
Ultra-Low Jitter (100G/400G Networks)	TI, Renesas, Skyworks	LMK003, 8P34S, Si5330
PCIe (Servers/PCs)	Renesas, Diodes, Microchip	9DBL, PI6CB, SY756
Low-Cost Single-Ended (Consumer Electronics)	TI, onsemi, Diodes	LMK1C, 74AC, PI6C
RF/JESD204B (Medical/Base Stations)	ADI, TI	HMC70, AD95, LMK048
Phase Sync (FPGA/System Clocks)	Renesas, TI	IDT23, CDCV

Chinese Domestic Clock Buffer Manufacturers

1. Specialized Clock IC Vendors

• DPTel (Dapeng Technology): A domestic leader in low-jitter, low-power solutions for 5G and high-performance computing.
  • Models: INS6110 (10-ch LVCMOS), INS6208 (Differential).
• Novosense: Known for isolation and interface chips, now expanding into high-performance clock trees.
  • Models: NSC92xx series for servers; NCA9511 for I2C buffers.

2. General Signal Chain Leaders

• 3Peak: Focuses on low-jitter distribution with strict quality control for automotive and industrial chains.
  • Models: TPA1xx series.
• SGMicro: High availability for consumer, security, and industrial markets.
  • Models: SGM74xx series.
• Runic: Provides cost-effective, Pin-to-Pin replacements for TI’s LMK1C110x series.
  • Models: RS1C110x series.

3. Logic and High-Speed Interface Vendors

• CETC 58th Institute (Zhongkexin): State-owned entity focusing on high-reliability aerospace and military-grade domestic replacements for TI’s LMK and CDCL series.
• Gainsil: Specializes in low-cost, small-package 1:2 and 1:4 fanout buffers.
  • Models: GS series.

Domestic Selection & Replacement Guide

Application Need	Recommended Domestic Vendor	Key Prefix	Target Replacement
Ultra-High Performance/5G	DPTel	INS6xxx	LMK003, 8P34S
Standard Industrial/Pin-to-Pin	Runic	RS1C	LMK1C11xx
High-Perf Server/PCIe	Novosense	NSC / NCA	Si533, 9DBL
High Reliability/Aero/Military	CETC 58th	CKX	CDCL, CDCV
General Consumer/Low Cost	SGMicro / Gainsil	SGM / GS	74 Series

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The Conductor Metaphor:

• The Conductor: The Crystal/Clock Generator.
• The Sound System & Monitors: The Clock Buffer.

Clock Buffer Core Functions:

• Fanout: Copies one input signal into 2, 4, or up to 20+ outputs.
• Drive Strength: Provides stronger current to drive heavy loads that raw signals cannot handle.
• Signal Shaping & Isolation: Restores distorted square waves and prevents downstream interference from affecting the source.
• Level Translation: Converts voltages (e.g., 3.3V to 1.8V) or signal formats (e.g., single-ended to differential).

Typical Application Scenarios

Clock buffers are essential for high-performance systems requiring multi-chip synchronization or long-distance transmission.

1. Telecom Infrastructure (5G Base Stations & Switches): Requires extreme synchronization to prevent packet loss. Ultra-low jitter buffers ensure timing deviations stay within picoseconds ($10^{-12}$s).
2. Data Centers & Servers: Mainboards house dozens of DDR slots and PCIe lanes. PCIe-specific buffers with Zero Delay ensure consistent timing across high-speed buses.
3. Industrial Automation & Robotics: Buffers isolate precision clock signals from motor noise and electromagnetic interference (EMI) on production lines.
4. Automotive Electronics (ADAS & Smart Cockpits): AEC-Q100 certified buffers ensure reliable data distribution between sensors (Lidar/Radar) and compute platforms under extreme temperatures.
5. Medical Imaging (CT, Ultrasound, MRI): Buffers provide synchronized triggers for massive ADC arrays, ensuring clear, ghost-free images.

Clock Buffer: Five Core Categories

1. Fanout Buffers: The most common type. One input to multiple outputs. Reduces master clock load.
   • Examples: TI LMK00304, Renesas 8P34S1208, Microchip SY89833L.
2. Zero Delay Buffers (ZDB): Uses internal Phase-Locked Loops (PLLs) to align output phases with input phases. Compensates for propagation delay.
   • Examples: Infineon CY2305, Renesas IDT2308, TI CDCV304.
3. Level & Format Translators: Focuses on compatibility. Converts between formats like LVCMOS, LVDS, and LVPECL.
   • Examples: TI CDCLVP111, onsemi NB6L11, ADI MAX9315.
4. PCIe Specific Buffers: Designed for PCI Express standards. Typically uses HCSL levels and meets strict jitter specs for PCIe Gen 1-6.
   • Examples: Renesas 9DBL0452, Diodes PI6C557, Microchip ZL40230.
5. High-Stability Buffers (TCXO/OCXO): Used in high-precision RF and base stations. Buffers stable sine waves and converts them to digital pulses.
   • Examples: Skyworks Si5330, TI LMK00101.