Clock Gating Cells: Propagation Delay Typically <100 ps

Q: What is the main purpose of clock gating cells?

The primary purpose is to reduce dynamic power consumption in digital circuits by selectively stopping the clock signal to inactive blocks, minimizing unnecessary switching activity.

Q: How do clock gating cells prevent glitches?

Advanced ICG cells incorporate a latch that captures the enable signal only during the safe phase of the clock (e.g., low phase), ensuring the gating action occurs synchronously and avoids hazardous transitions that could cause glitches.

Q: In which industries are clock gating cells most critical?

They are crucial in industries producing low-power electronic devices, such as consumer electronics (smartphones, wearables), automotive electronics (ECUs), IoT devices, and data center hardware, where energy efficiency is paramount.

Component Specifications

Definition

Clock gating cells are specialized digital logic elements integrated into semiconductor designs to dynamically control the distribution of clock signals. They function by inserting logic gates (typically AND, OR, or latch-based structures) in the clock path, enabling or disabling the clock to specific functional blocks, registers, or modules based on enable signals derived from system activity. This technique reduces dynamic power consumption by preventing unnecessary clock toggling in inactive circuit sections, which is critical in low-power VLSI/ASIC designs, microprocessors, and system-on-chip (SoC) architectures.

Working Principle

Clock gating operates by using an enable signal (often generated by finite state machines or control logic) to control a gating element. When the enable is inactive ('0'), the gating cell blocks the clock signal, holding it at a constant level (usually low) to the downstream circuitry. When enabled ('1'), the clock passes through unchanged. Advanced implementations use integrated clock-gating (ICG) cells with latch structures to prevent glitches and ensure the clock is only gated at safe, non-active edges, maintaining timing integrity. The key principle is reducing switching activity, as dynamic power in CMOS circuits is proportional to clock frequency and capacitive load.

Materials

Semiconductor materials: Silicon (Si) substrate with CMOS technology (e.g., FinFET, planar CMOS). Fabricated using photolithography, doping, and metallization processes. Package materials: Typically encapsulated in epoxy molding compound with copper alloy leads or solder balls for surface-mount technology (SMT).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Gating Type	AND-based, OR-based, Latch-based ICG
Power Reduction	Up to 20-40% dynamic power savings
Setup/Hold Time	Specified per technology node (e.g., 10-50 ps)
Technology Node	7nm, 10nm, 14nm, 28nm, etc.
Clock Skew Impact	Minimized via balanced insertion
Operating Voltage	0.8V to 1.2V (depending on node)
Propagation Delay	Typically <100 ps

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 26262, IEC 61508, JEDEC JESD78, IEEE 1801 (UPF)

Parent Products

This component is used in the following industrial products

Clock Management

A functional block within FPGA or ASIC designs responsible for generating, distributing, and controlling clock signals.

View Product Details

Clock Management Circuit

A specialized electronic circuit within a Graphics Interface Controller that generates, distributes, and synchronizes clock signals for various components.

View Product Details

Engineering Analysis

Risks & Mitigation

Timing violations due to improper insertion
Clock skew and jitter introduction
Increased design complexity and verification effort
Potential for functional errors if enable logic is flawed
Electromagnetic interference (EMI) from abrupt clock stopping

FMEA Triads

Trigger: Incorrect enable signal timing or logic
Failure: Clock gated prematurely or not gated when required, causing system malfunction or excessive power consumption
Mitigation: Implement rigorous static timing analysis (STA), use formal verification for enable conditions, and adopt latch-based ICG cells for glitch protection

Trigger: Process variations or aging effects in semiconductor fabrication
Failure: Increased propagation delay or setup/hold violations, leading to timing failures
Mitigation: Apply design margin (guard-banding), use on-chip variation (OCV) analysis, and select robust technology nodes with characterized aging models

Trigger: Electrostatic discharge (ESD) or voltage spikes
Failure: Physical damage to gating cell, resulting in permanent stuck-at faults or leakage
Mitigation: Integrate ESD protection circuits at I/Os, follow JEDEC handling standards, and implement power gating for additional protection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Timing tolerance: ±5% of clock period for setup/hold; power tolerance: within 10% of simulated power targets

Test Method

Automated test pattern generation (ATPG) for stuck-at faults, power-aware simulation with switching activity interchange format (SAIF), and silicon validation using on-chip power monitors

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Clock Gating Cells

Manufacturer profiles associated with Clock Gating Cells.

Sourcing Clock Gating Cells from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Marking Ink

Specialized ink for permanent identification on surface mount resistors during manufacturing.

Dielectric Layer

Insulating layer in surface mount capacitors that stores electrical energy through polarization.

Optical Window

Transparent optical component for light transmission in polycarbonate lens housings

PCB Substrate

PCB substrate is the foundational insulating layer that provides mechanical support and electrical connectivity for electronic components in high-speed memory modules.

Frequently Asked Questions

What is the main purpose of clock gating cells?