Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
2308A-5HPGG8 Renesas Electronics America	IC CLOCK MULT ZD HI DRV 16-TSSOP	0
8T49N222B-100NLGI Renesas Electronics America	IC TRANSLATOR UNIV FREQ 48VFQFN	0
9FGV1006BQ505LTGI Renesas Electronics America	IC CLOCK GENERATOR 16LGA	459
23S09E-1HPGGI Renesas Electronics America	IC CLK BUFF ZD SPRDSPECT 16TSSOP	0
8V97003NLGI8 Renesas Electronics America	VFQFPN 7.00X7.00X0.90 MM, 0.50MM	0
2305A-1DCG Renesas Electronics America	IC CLK BUFFER ZD 3.3V 8-SOIC	17
9FGV1006Q506LTGI Renesas Electronics America	IC CLOCK GENERATOR 16LGA	0
7152M-11LFT Renesas Electronics America	IC CLOCK GENERATOR 8-SOIC	0
5L35023-000NLGI Renesas Electronics America	IC CLOCK GENERATOR 24VFQFPN	628
552ARI-01LFT Renesas Electronics America	IC OSC/MULT/BUFFER OCT 20-SSOP	0
MK2703SILFTR Renesas Electronics America	IC PLL AUD CLK SYNTHESIZER 8SOIC	0
9112AM-16LF Renesas Electronics America	IC BUFFER ZD HI PERFORM 8SOIC	301
844N234AKILFT Renesas Electronics America	IC SYNTHESIZER LVPECL 32VFQFN	0
8T49N004A-056NLGI Renesas Electronics America	IC CLK GENERATOR LVPECL 32VFQFN	0
8T49N004A-061NLGI8 Renesas Electronics America	IC CLK GENERATOR LVPECL 32VFQFN	0
8T49N240-027NLGI Renesas Electronics America	VFQFPN 6.00X6.00X0.90 MM, 0.50MM	0
23S05-1HDCG8 Renesas Electronics America	IC CLK BUFFER PLL HI DRV 8-SOIC	0
8T49N008A-058NLGI8 Renesas Electronics America	VFQFPN 6.00X6.00X0.90 MM, 0.50MM	0
8V41N004NLGI Renesas Electronics America	IC CLOCK GENERATOR 32VFQFPN	0
8T49N004A-033NLGI Renesas Electronics America	IC CLK GENERATOR LVPECL 32VFQFN	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.