Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CY28419ZC Rochester Electronics	PROCESSOR SPECIFIC CLOCK GENERAT	8159
CY2213ZC-1T Rochester Electronics	CLOCK GENERATOR, 400MHZ, CMOS	2400
CY2213ZC-1 Rochester Electronics	CLOCK GENERATOR, 400MHZ, CMOS	31820
CY22392ZXC-363 Rochester Electronics	PROGRAMMABLE CLOCK GENERATOR	5964
CY28342OCT Rochester Electronics	PROCESSOR SPECIFIC CLOCK GENERAT	12960
PY28405OC-3 Rochester Electronics	CLOCK SYNTHESIZER	9640
CY24115SZC-2 Rochester Electronics	CLOCK GENERATOR 1MHZ TO 30MHZ IN	3418
W312-02HT Rochester Electronics	PROCESSOR SPECIFIC CLOCK GENERAT	43000
CY2292SI-705 Rochester Electronics	PROGRAMMABLE PLL CLOCK GENERATOR	3618
CY22150KZXI-311T Rochester Electronics	CLOCKS	2500
CY25818SCT Rochester Electronics	16MHZ, OTHER CLOCK GENERATOR	6242
CY7B9973V-AXC Rochester Electronics	PLL CLOCK DRIVER	703
CY28405OC-3T Rochester Electronics	CLOCK SYNTHESIZER W/DIFFERENTIAL	16000
CY2071ASL-619 Rochester Electronics	GENERAL PURPOSE EPROM PROGRAMMAB	2961
W49C31-20AGT Rochester Electronics	CLOCK GENERATOR	6000
CY2292SL-1P6T Rochester Electronics	PROGRAMMABLE PLL CLOCK GENERATOR	10000
PY28405OC-3T Rochester Electronics	CLOCK SYNTHESIZER	43990
PY26126SC Rochester Electronics	MPEG CLOCK GENERATOR WITH VCXO	14774
CY22393ZC-524T Rochester Electronics	PROGRAMMABLE CLOCK GENERATOR	12795
PY2305SI-1 Rochester Electronics	CLOCKS	4772

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.