Clock/Timing

Clock/Timing

Clock Timing covers the parts that keep a system synchronized: crystal oscillators, clock generators, jitter cleaners, PLLs, buffers, dividers, and real-time clocks. Some designs only need a simple 25 MHz oscillator to drive an MCU, while others depend on a low-jitter clock tree for Ethernet, SerDes, RF, or data converter timing. These parts show up everywhere, from industrial controllers and network switches to medical devices, telecom line cards, and automotive modules. When buyers source clock timing components, the first thing they usually check is frequency stability and jitter, because a cheaper part with worse phase noise can force a redesign later. Package matters too. A lot of engineers still prefer standard SMD packages like 3225 or 5032 for oscillators, but smaller designs keep pushing toward tighter footprints and lower current draw. Supply is the other big issue. Active clock ICs from major brands can go on allocation without much warning, and older RTC or buffer part numbers sometimes drift into last-time-buy status while production is still running. That is where the trade-off usually shows up: pay more for a branded, traceable part now, or gamble on a gray-market offer and risk inconsistent date codes, poor storage, or outright counterfeit stock. For procurement teams, packaging preference is not a small detail either. Tape-and-reel is fine for production, but many repair and NPI builds still need cut tape or small quantities with proper labels and handling. If you are comparing clock timing parts, it helps to send the exact part number, required quantity, target date code, and whether alternates are acceptable. For current stock, lead time, or a quote, check availability at icxing.com.

Frequently Asked Questions

How do I know if a clock timing part is genuine when buying from the open market?

Ask for photos of the label, reel, and lot or date code before placing the order. For timing ICs and oscillators, inconsistent markings and mixed date codes are common warning signs, especially on older or allocated part numbers. Buying through a distributor that can provide traceability lowers that risk.

What specs matter most when comparing oscillators and clock generators?

Start with frequency, stability over temperature, supply voltage, output type, and jitter. For simple MCU clocks, basic stability may be enough, but Ethernet, FPGA, and RF designs often need much tighter phase noise performance. The right part depends on the system budget, not just the headline frequency.

Why do clock timing lead times vary so much between similar part numbers?

Small differences in package, temperature range, frequency option, or output format can turn a common part into a factory-order item. Standard frequencies and popular SMD packages usually move faster, while custom or legacy options may carry long lead times. If your build is urgent, ask about approved alternates early.

Image Part Manufacturer Description Stock Action
ICS557G-06 Intersil (Renesas Electronics Corporation)
IC CLK BUFFER 1:4 H...
3,890
In-stock
Inquiry
ICS557G-06T Intersil (Renesas Electronics Corporation)
IC CLK BUFFER 1:4 H...
5,080
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ICS557G-08 Intersil (Renesas Electronics Corporation)
IC MUX 2:1 PCI EXPR...
5,730
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557G-08LFT Intersil (Renesas Electronics Corporation)
IC MUX 2:1 PCI EXPR...
5,430
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Inquiry
ICS557G-08T Intersil (Renesas Electronics Corporation)
IC MUX 2:1 PCI EXPR...
1,960
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Inquiry
ICS557GI-03 Intersil (Renesas Electronics Corporation)
IC CLK SOURCE PCI...
6,500
In-stock
Inquiry
ICS557GI-03T Intersil (Renesas Electronics Corporation)
IC CLK SOURCE PCI...
4,620
In-stock
Inquiry
ICS557GI-06 Intersil (Renesas Electronics Corporation)
IC CLK BUFFER 1:4 H...
2,620
In-stock
Inquiry
ICS557GI-06T Intersil (Renesas Electronics Corporation)
IC CLK BUFFER 1:4 H...
5,220
In-stock
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557GI-08LFT Intersil (Renesas Electronics Corporation)
IC MUX 2:1 PCI EXPR...
3,280
In-stock
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ICS557M-01 Intersil (Renesas Electronics Corporation)
IC CLK SOURCE PCI...
6,730
In-stock
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ICS557M-01T Intersil (Renesas Electronics Corporation)
IC CLK SOURCE PCI...
1,830
In-stock
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813076CYILF Intersil (Renesas Electronics Corporation)
IC VCXO-PLL WIREL...
1,960
In-stock
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813076CYILFT Intersil (Renesas Electronics Corporation)
IC VCXO-PLL WIREL...
3,310
In-stock
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840S06AKILF Intersil (Renesas Electronics Corporation)
IC CLOCK GENERAT...
2,680
In-stock
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840S06AKILFT Intersil (Renesas Electronics Corporation)
IC CLOCK GENERAT...
2,480
In-stock
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841204AK-245LF Intersil (Renesas Electronics Corporation)
IC CLOCK SYNTHES...
3,360
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841204AK-245LFT Intersil (Renesas Electronics Corporation)
IC CLOCK SYNTHES...
1,370
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841204AKI-245LF Intersil (Renesas Electronics Corporation)
IC CLOCK SYNTHES...
2,770
In-stock
Inquiry
841204AKI-245LFT Intersil (Renesas Electronics Corporation)
IC CLOCK SYNTHES...
1,770
In-stock
Inquiry