Precision timing: unlocking efficiency and advancing semiconductor sustainability
As AI infrastructure, data centres and edge computing continue their rapid scale-up, the systems that win on efficiency will be those in which timing shapes architecture from the outset of design. Sustainability in the semiconductor industry is often a natural consequence of better engineering.
By Taylor Aston-Nielsen, SiTime
The global sustainability drive is in full swing. Against a backdrop of environmental targets, a spotlight has fallen on the semiconductor industry. Its role as the foundational enabler
of technology, its exponential growth and its resource intensity means the sector is under pressure to lead and deliver.
As demand from applications such as AI infrastructure, data centres, and edge computing continues to rise, power consumption is becoming a defining challenge. Engineering-led sustainability is taking shape in the semiconductor industry, with meaningful reductions in energy use across entire systems being achieved thanks to the right design choices. At system level, Precision Timing is emerging as a critical factor in improving energy efficiency.
Energy efficiency as a first-order design parameter
The new generation of timing products is being designed in response to system-level efficiency problems. Energy efficiency is now an explicit goal of timing accuracy, rather than being treated as a secondary characteristic or byproduct.
A clear illustration of efficiency as a design-stage priority - rather than an afterthought – is found in AI data centre infrastructure. Every second a GPU sits idle is power spent for zero revenue, with a negative impact on performance per watt (PPW).
With the onus on engineers to design for efficiency, timing has joined compute, network and power delivery to become the fourth critical domain for optimal GPU utilisation. Better time synchronisation enables improved scheduling and traffic management in AI data centres, which in turn means that the XPUs are spending more time working and less time idling. Work measurements of tokens processed and tokens per watt and dollar are key factors in AI infrastructure buying decisions.
For semiconductor professionals, the practical implication is that more energy efficiency considerations have moved into the early stage of the design process, down to component-level decisions such as timing architecture.
How Precision Timing improves performance per watt
Timing components such as oscillators, resonators and clock ICs are sometimes described as the ‘heartbeat’ of an electronic system. Every coordinated action across a distributed system depends on a clock signal that all
parts of that system can agree on. When that signal drifts, the consequences ripple outwards, causing unreliable data transfer and misaligned subsystems.
A more accurate clock signal shortens that active window. The system spends less time drawing peak current and returns more quickly to a low-power state. Accurate time synchronisation also allows engineers to identify the cause of delays, such as compute imbalance or network congestion. Tighter and more precise synchronisation is eliminating the need for conservative guard bands and wait times at every epoch barrier. Multiplied across millions of cycles and millions of deployed units, efficiency gains compound into a system-wide reduction in energy consumption.
With GPU utilisation in some data centres often operating well below their theoretical capacity, Precision Timing has become a key enabler of higher performance per watt and improved data centre efficiency. Timing components based on Microelectromechanical System (MEMS) technology have achieved new levels of accuracy. The latest TCXO oscillators have taken synchronisation across an AI cluster from 1-10 microseconds to a matter of nanoseconds, or sub-nanosecond in some cases.
The far-reaching impact of timing architecture
Beyond PPW, Precision Timing is playing a part in architecture-level sustainability gains. Timing architecture has moved to the top of the priority list for designers of hyperscale systems such as AI supercomputers, cloud infrastructures and the largest online consumer platforms.
Designs that rely on multiple fixed-frequency oscillators to meet varying frequency, voltage and stability requirements involve an investment in more materials, occupy more board space and increase the manufacturing footprint with each part. MEMS-based timing devices replace several fixed-function components with a single, software-configurable alternative. The sustainability benefits are cumulative; a reduction in the number of devices on the board, an improvement in supply chain efficiency and the simplification of design.
The advantage of programmability in MEMS devices extends into the operational lifetime of products. There are more opportunities for tuning, such as adjusting jitter parameters for a new protocol or compensating for drift.
Smaller footprint paving the way for more efficient designs
In electronics, component miniaturisation is an age-old design objective. Today’s dense data centre environments, edge devices and AI infrastructure have become constraints on system efficiency. Every millimetre saved on a timing component can enable an improvement.
MEMS-based timing solutions are resource savers in smaller, more efficient designs, with a footprint that is twice as small as traditional timing devices. MEMS resonators, with up to 3000x less mass, are at the core of this benefit. This reduction in mass translates directly into smaller packages for timing chips.
MEMS timing devices can also bring supporting circuitry on chip. For example, integrating terminal resistors to eliminate external source-bias resistors, offering an internal voltage regulation filter, and negating the need for external load capacitors. The result is fewer external components surrounding the device, shortening the bill of materials and freeing up precious board real estate.
More opportunities for integrations can offer additional power efficiency. Programmable output voltage and dynamic frequency control allow MEMS timing devices to be tuned more precisely to application needs. Features such as switchable output clocks allow unused outputs to be powered down rather than left idling.
Crucially, none of these efficiency gains come at the expense of reliability. Along with miniaturisation, MEMS timing devices also offer superior resilience to shock, vibration and rapid temperature fluctuations, making them more robust in demanding deployment environments such as data centres. Oscillators built on solid-state silicon MEMS technology can be relied on to maintain frequency stability and deliver reliable, accurate timing.
Where desired performance and sustainability meet
Compared to sectors that tend to view sustainability as a list of constraints, the semiconductor sector is in a promising position.
The boom in AI data centres – which will create a semiconductor market worth $1.2 trillion (£895 billion) by 2028, according to the Semiconductor Industry Association – has placed demands on modern timing chips to support improved GPU performance in the face of environmental extremes. In meeting these demands and enabling more performance from each watt consumed, the result is a new level of efficiency and a range of sustainability benefits.
Precision Timing is an enhancement that enables engineers to design lower-power, longer-lasting products while reducing system component counts. Smaller, more resource-efficient devices are translating directly into lower system-wide energy consumption and emissions.
As AI infrastructure, data centres and edge computing continue their rapid scale-up, the systems that win on efficiency will be those in which timing shapes architecture from the outset of design. Sustainability in the semiconductor industry is often a natural consequence of better engineering.
