Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
308RLF Flip Electronics	CLOCK SYNTHESIZER / JITTER CLEAN	0
87322BYILF Flip Electronics	CLOCK GENERATORS & SUPPORT PRODU	18
8430BY-71LF Flip Electronics	CLOCK SYNTHESIZER / JITTER CLEAN	0
844004BGI-01LF Flip Electronics	CLOCK SYNTHESIZER	0
8745BM-21LF Flip Electronics	CLOCK GENERATORS & SUPPORT PRODU	0
CY23S09SXC-1T Flip Electronics	PLL BASED CLOCK DRIVER, 23S SERI	2339
CY2907FX8 Flip Electronics	CLOCK GENERATOR, 100MHZ, CMOS, P	3566
8752CYILF Flip Electronics	IC CLK MULT/ZD BUFFER 32-LQFP	0
674R-01LF Flip Electronics	CLOCK DRIVERS & DISTRIBUTION USE	0
2308-1HDCG Flip Electronics	IC CLK MLTPLR ZDB 1:8 16SOIC	0
670M-02LF Flip Electronics	CLOCK BUFFER LOW NOISE ZERO DELA	6664
CY25812SXCT Flip Electronics	CLOCK GENERATOR, 64MHZ, CMOS, PD	0
844003BG-01LF Flip Electronics	CLOCK SYNTHESIZER / JITTER CLEAN	0
348RIPLF Flip Electronics	IC CLK SYNTHESIZER QUAD 20-QSOP	0
CY7B995AXI Flip Electronics	PLL BASED CLOCK DRIVER, 7B SERIE	7025
MPC9315AC Flip Electronics	CLOCK GENERATORS & SUPPORT PRODU	0
307M-02LF Flip Electronics	IC CLOCK SOURCE PROGR 16-SOIC	33764
508MLF Flip Electronics	PECL TO CMOS/TTL TRANSLATOR, 1 F	14498
CY25814SXI Flip Electronics	CLOCK GENERATOR, 128MHZ, CMOS, P	0
844001AGLF Flip Electronics	CLOCK GENERATOR, 226.66MHZ, CMOS	0

Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

1. Overview

Clock and timing ICs are semiconductor devices that generate, regulate, and distribute timing signals in electronic systems. Key components include Clock Generators (produce stable clock signals), Phase-Locked Loops (PLLs, synchronize signals with phase alignment), and Frequency Synthesizers (generate precise frequencies from reference signals). These devices ensure synchronization across components in modern electronics, enabling reliable operation in communication systems, computing devices, and industrial equipment.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Clock Generators	Produce fixed or programmable clock signals with low jitter	Microprocessors, FPGAs, networking equipment
PLLs	Align output signal phase with reference input, enable frequency multiplication	Wireless transceivers, data recovery circuits
Frequency Synthesizers	Generate multiple frequencies from single reference with high precision	5G base stations, satellite communication systems

3. Structure and Components

Typical clock ICs feature: 1) Crystal oscillator interface for reference signal input; 2) Internal voltage-controlled oscillator (VCO); 3) Phase detector and loop filter (PLL components); 4) Programmable dividers; 5) Output buffers. Advanced packages include QFN (4x4mm to 8x8mm) and TSSOP with 8-48 pins. Integration levels vary from single-channel devices to multi-output clock generators with integrated EEPROM.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Frequency Range	1 kHz - 3.6 GHz	Determines application compatibility
Phase Noise	-150 to -120 dBc/Hz	Impacts signal integrity
Jitter (RMS)	50 fs - 1 ps	Critical for high-speed systems
Power Consumption	10-300 mA	Affects thermal design
Temperature Stability	20-100 ppm	Ensures reliability in harsh environments

5. Application Fields

Telecommunications: 5G NR base stations, optical transceivers
Computing: Server motherboards, PCIe clocks
Industrial: Precision test equipment, motor control systems
Automotive: ADAS sensors, infotainment systems
Medical: MRI imaging systems, patient monitoring devices

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI (Texas Instruments)	LMX2594	15-GHz wideband PLL with integrated VCO
Analog Devices	AD9548	4-channel clock generator with 0.1 ppb accuracy
STMicroelectronics	CLK2692	Programmable 2-output synthesizer for automotive
Microchip	ZL30264	High-performance network synchronizer

7. Selection Guidelines

Key selection criteria: 1) Required output frequency and voltage levels; 2) Acceptable phase noise/jitter specifications; 3) Number of required outputs; 4) Operating temperature range; 5) Power budget constraints; 6) Integration level (e.g., single-chip vs. discrete VCO solutions). For wireless applications, prioritize low phase noise. For portable devices, emphasize power efficiency.

8. Industry Trends

Future developments include: 1) Higher integration with on-chip EEPROM and multi-phase outputs; 2) Advancement to sub-10fs jitter performance; 3) Development of radiation-hardened variants for aerospace; 4) Adoption of 3D packaging for reduced EMI; 5) Increased use of AI-enabled dynamic frequency scaling. The market is projected to grow at 7.2% CAGR through 2027 driven by 5G and automotive electrification.