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
ISL1221IUZ-T Intersil (Renesas Electronics Corporation)
IC RTC EVENT REC ...
1,460
In-stock
Inquiry
ISL12024IBZ Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
5,280
In-stock
Inquiry
1337AGDVGI Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
6,870
In-stock
Inquiry
1338-31DVGI Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
1,550
In-stock
Inquiry
ISL12024IRTCZ Intersil (Renesas Electronics Corporation)
REAL-TIME CLOCK/C...
6,440
In-stock
Inquiry
ISL1208IU8Z-TK Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
7,070
In-stock
Inquiry
ISL12020MIRZ Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
5,070
In-stock
Inquiry
ISL12020MIRZ-T7A Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
5,890
In-stock
Inquiry
ISL1208IU8Z Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
4,960
In-stock
Inquiry
ISL12057IUZ Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
4,360
In-stock
Inquiry
ISL12026IBZ Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
5,430
In-stock
Inquiry
ISL12022IBZ Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
7,060
In-stock
Inquiry
1338-31DCGI8 Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
1,660
In-stock
Inquiry
ISL12026IVZ Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
1,250
In-stock
Inquiry
HD146818RXP Intersil (Renesas Electronics Corporation)
REAL TIME CLOCK P...
4,560
In-stock
Inquiry
ISL12057IBZ-T Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
3,180
In-stock
Inquiry
ISL12057IUZ-T Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
6,580
In-stock
Inquiry
ISL12026AIVZ-T Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
3,870
In-stock
Inquiry
ISL1208IU8Z-T7A Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
5,520
In-stock
Inquiry
ISL12022IBZ-T7A Intersil (Renesas Electronics Corporation)
IC RTC CLK/CALEND...
3,690
In-stock
Inquiry