Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CY2292SL-1F9 Rochester Electronics	PROGRAMMABLE PLL CLOCK GENERATOR	684
CY2XP304BVC Rochester Electronics	CLOCK GENERATOR, 1500MHZ PBGA36	71
W42C31-04G Rochester Electronics	CLOCK GENERATOR, 69.006MHZ, CMOS	2385
PY23S05SC-1H Rochester Electronics	CLOCKS	3696
W181-53SZ Rochester Electronics	CLOCK GENERATOR, 75MHZ, CMOS	9858
CY2292SL-1V6 Rochester Electronics	PROGRAMMABLE PLL CLOCK GENERATOR	786
CY2XP241ZXI Rochester Electronics	IC XO LVPECL PROGR 8-TSSOP	3035
CY2292SL-1T5 Rochester Electronics	PROGRAMMABLE PLL CLOCK GENERATOR	7115
CY27020SC Rochester Electronics	CLOCK GENERATOR, 48MHZ, CMOS	4173
CYW2330ZI Rochester Electronics	PLL FREQUENCY SYNTHESIZER	1423
IMIC9827JTT Rochester Electronics	LOW SKEW CLOCK GENERATOR	7250
CY241V08SXC-41 Rochester Electronics	CLOCK GENERATOR	5267
CY2081SC-59 Rochester Electronics	THREE-PLL TRANSISTOR EPROM-PROGR	2973
CY28346ZC-2 Rochester Electronics	PROCESSOR SPECIFIC CLOCK GENERAT	9920
CY2XL12ZXI02 Rochester Electronics	CLOCK GENERATOR, 100MHZ PDSO8	8832
CY2292SL-1U2 Rochester Electronics	PROGRAMMABLE PLL CLOCK GENERATOR	5792
W159H Rochester Electronics	FTG FOR SERVERWORKS HE	402
CY2545I Rochester Electronics	CLOCKS	15463
CY2292SL-1J4T Rochester Electronics	TRIPLE PLL CLOCK GENERATOR	2500
PCY2305SC-1H Rochester Electronics	CLOCKS	2230

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.