Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
5X1503-000NLGI8 Renesas Electronics America	MICROCLCK PROGRAM CLCK GENERATOR	2979
MK5811CMILF Renesas Electronics America	IC CLK GENERATOR LOW EMI 8SOIC	0
5P49V5901B040NLGI8 Renesas Electronics America	IC CLOCK GENERATOR 24VFQFPN	0
252PMILFT Renesas Electronics America	IC CLK SYNTHESIZER FP DUAL 8SOIC	0
8T49N008A-054NLGI8 Renesas Electronics America	VFQFPN 6.00X6.00X0.90 MM, 0.50MM	0
8V19N492NLGI Renesas Electronics America	IC FEMTOCLOCK NG JITTER 88VFQFPN	88
841N254BKILFT Renesas Electronics America	VFQFPN 5.00X5.00X0.90 MM, 0.50MM	0
5V49EE501NLGI8 Renesas Electronics America	IC CLK GEN EEPROM PROGR 24QFN	0
8T49N222B-100NLGI8 Renesas Electronics America	IC TRANSLATOR UNIV FREQ 48VFQFN	0
5L1503-000NVGI8 Renesas Electronics America	MICROCLCK PROGRAM CLCK GENERATOR	2530
87974CYILF Renesas Electronics America	IC CLK GEN LVCMOS/LVTTL 52-LQFP	2
5P49V5901B586NLGI8 Renesas Electronics America	IC CLOCK GENERATOR 24VFQFPN	0
7152MI-11LF Renesas Electronics America	IC CLK GEN SPREAD SPECTRUM 8SOIC	93
5P49V5901B041NLGI8 Renesas Electronics America	IC CLOCK GENERATOR 24VFQFPN	0
23S05-1HDCGI8 Renesas Electronics America	IC CLK BUFFER ZD 3.3V 8-SOIC	0
8T49N240-030NLGI Renesas Electronics America	VFQFPN 6.00X6.00X0.90 MM, 0.50MM	0
83PN156DKILFT Renesas Electronics America	IC SYNTHESIZER 10VFQFN	0
5P49V5929B000NLGI Renesas Electronics America	IC CLOCK GENERATOR 24VFQFPN	0
5P49V5901B629NLGI8 Renesas Electronics America	IC CLOCK GENERATOR 24VFQFPN	0
7152M-11LF Renesas Electronics America	IC CLOCK GENERATOR 8-SOIC	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.