Clock/Timing - Clock Buffers, Drivers

Part Number	Description / PDF	Quantity
CDCLVD110AVFR Texas Instruments	IC CLK BUFFER 2:10 1.1GHZ 32LQFP	1165
CY29947AXC IR (Infineon Technologies)	LOW SKEW CLOCK DRIVER, 29947 SER	10703
ZL40207LDG1 Roving Networks / Microchip Technology	IC CLK BUFFER 1:8 750MHZ 32QFN	0
SI53340-B-GMR Silicon Labs	IC CLK BUFFER 2:4 LVDS 16QFN	0
853S9252BKILF Renesas Electronics America	IC CLK BUFFER 1:2 3GHZ 16 VQFP	0
CY2CC810OXI IR (Infineon Technologies)	LOW SKEW CLOCK DRIVER, 2CC SERIE	1890
CY29949AXIT IR (Infineon Technologies)	LOW SKEW CLOCK DRIVER	2972
SI53302-B-GM Silicon Labs	IC CLK BUFFER 2:10 725MHZ 44QFN	0
8SLVP2102ANLGI/W Renesas Electronics America	IC CLK BUFFER 1:2 2GHZ 16QFN	0
ZL40230LDF1 Roving Networks / Microchip Technology	LOW SKEW, LOW ADDITIVE JITTER 3	0
CY29940AIT	LOW SKEW CLOCK DRIVER	1900
74FCT807BTPYGI Flip Electronics	LOW SKEW CLOCK DRIVER, FCT SERIE	0
8737AG-11LF Renesas Electronics America	IC CLK BUFFER 2:2 650MHZ 20TSSOP	79
621MILF Renesas Electronics America	IC CLK BUFFER 1:4 200MHZ 8SOIC	0
SY89829UHY Roving Networks / Microchip Technology	IC CLK BUFFER 2:10 2GHZ 64TQFP	68
ZL40209LDF1 Roving Networks / Microchip Technology	IC CLK BUFF MUX 2:6 750MHZ 32QFN	0
CY7B994V-5BBI Rochester Electronics	MULTI-PHASE PLL CLOCK BUFFER	185
NB3N551MNR4G Sanyo Semiconductor/ON Semiconductor	IC CLK BUFFER 1:4 180MHZ 8DFN	0
SI53361-B-GM Silicon Labs	2:8 CMOS BUFFER (200MHZ), 2:1 LV	0
853S057AGILFT Renesas Electronics America	IC CLK MULTIPLX 4:1 3GHZ 20TSSOP	0

Clock/Timing - Clock Buffers, Drivers

1. Overview

Clock buffers and drivers are integrated circuits (ICs) designed to distribute clock signals in electronic systems. They amplify, condition, and route timing signals to multiple destinations while minimizing skew, jitter, and signal degradation. These components are critical in synchronizing operations across processors, memory modules, communication interfaces, and other timing-sensitive circuits. Their importance spans industries such as telecommunications, automotive, and high-performance computing.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Clock Buffers	Single-input, multiple-output devices with low phase noise and skew	CPU clock distribution, FPGA systems
Clock Drivers	High-drive capability for fan-out applications	Networking switches, server motherboards
Differential Clock Buffers	Supports LVDS, HCSL, and CML signal types	High-speed ADC/DAC systems, RF transceivers
Programmable Clock Buffers	Configurable output frequency/division ratios	Industrial automation, test equipment

3. Structure and Composition

Clock buffers/drivers typically consist of:

Input receivers (single-ended or differential)
Internal amplification stages
Output drivers with controlled impedance
Power supply decoupling structures
Thermal management pads (in QFN/SSOP packages)

They are fabricated using CMOS, Bipolar, or SiGe processes to optimize speed and noise performance.

4. Key Technical Specifications

Parameter	Description	Importance
Max Operating Frequency	Up to 1.2 GHz (CMOS), 3.2 GHz (SiGe)	Determines application suitability for high-speed systems
Additive Phase Jitter	0.05 ps RMS to 1 ps RMS	Impacts timing precision in data converters
Propagation Delay	50 ps to 5 ns	Critical in synchronized multi-channel systems
Output Voltage Levels	LVCMOS, LVDS, HSTL, etc.	Ensures compatibility with downstream circuits
Supply Voltage	1.8V to 5V	Affects power consumption and integration

5. Application Areas

Telecommunications: 5G base stations, optical transceivers
Computing: Servers, workstations, high-end PCs
Industrial: PLCs, motor controllers, test instruments
Automotive: ADAS clock synchronization, infotainment systems

Case Study: In 5G massive MIMO systems, low-jitter clock drivers ensure phase coherence across 64+ antenna elements.

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Specifications
TI (Texas Instruments)	CDCE62005	3.2 GHz LVDS driver, 0.1 ps RMS jitter
Analog Devices	ADCLK846	16-output clock buffer, 1.6 GHz bandwidth
STMicroelectronics	DF1610S	1.8V/3.3V dual supply buffer, 8 outputs
ON Semiconductor	MC100EP195	Differential ECL buffer, 2.5 GHz operation

7. Selection Recommendations

Key considerations:

Match output type to receiver requirements (LVDS/CML/LVCMOS)
Calculate required fan-out capacity with voltage margin
Specify jitter budget (e.g., <0.3 ps RMS for 10 Gbps SerDes)
Consider temperature stability (-40 C to +125 C automotive grade)
Optimize package size vs. thermal dissipation needs

8. Industry Trends

Future developments include:

Sub-100 fs jitter performance using advanced CMOS processes
Integration with PLL/VCO for clock generation
Multi-die packaging for hybrid signal conditioning
Energy-efficient designs for battery-powered IoT devices
Automotive-grade ICs with AEC-Q100 qualification