Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Image	Part Number	Description / PDF	Quantity	Rfq
	CY2291F Cypress Semiconductor	IC 3PLL EPROM CLOCK GEN 20-SOIC	0
	CY22801KSXC-155T Cypress Semiconductor	IC CLOCK GENERATOR	0
	CY23S08ZXC-1HT Cypress Semiconductor	IC CLK ZDB 8OUT 140MHZ 16TSSOP	0
	CY29973AXIT Cypress Semiconductor	IC CLK ZDB 12OUT 125MHZ 52TQFP	0
	CY2907FX14T Cypress Semiconductor	IC CLOCK GEN PROGR 14SOIC	0
	CY2548FCT Cypress Semiconductor	IC CLOCK GEN FIELD PRG 24-QFN	0
	CY29775AXIT Cypress Semiconductor	IC CLK ZDB 14OUT 200MHZ 52TQFP	0
	CY25200KFZXIT Cypress Semiconductor	IC CLOCK GEN PROG SPECT 16-TSSOP	0
	CY29351AXI Cypress Semiconductor	IC CLK ZDB 9OUT 200MHZ 32TQFP	0
	CY22801KSXC-011T Cypress Semiconductor	IC CLOCK GENERATOR	0
	CY7B994V-2BBXCT Cypress Semiconductor	IC CLK BUFF 18OUT 200MHZ 100LBGA	0
	CY88155PFT-G-103-JN-ERE1 Cypress Semiconductor	IC CLOCK GENERATOR EMI 8TSSOP	0
	CY26121KZXI-21 Cypress Semiconductor	IC SS CLOCK GENERATOR 16-TSSOP	0
	CY23FP12OXCT Cypress Semiconductor	IC CLK ZDB 12OUT 200MHZ 28SSOP	0
	CY25402SXC-008T Cypress Semiconductor	IC CLOCK GENERATOR	0
	CY29773AXI Cypress Semiconductor	IC CLK ZDB 14OUT 125MHZ 52TQFP	0
	CY7B993V-5AXCT Cypress Semiconductor	IC CLK BUFF 18OUT 100MHZ 100LQFP	0
	CY7B994V-2BBIT Cypress Semiconductor	IC CLK BUFF 18OUT 200MHZ 100LBGA	0
	CY7B9910-5SXCT Cypress Semiconductor	IC CLK BUFF SKEW 8OUT 24SOIC	0
	CY7B995AXCT Cypress Semiconductor	IC CLK BUFF 8OUT 200MHZ 44TQFP	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.