ICS280PG - 200MHz Triple PLL Spread Spectrum Clock Generator | Renesas Electronics
MPN： ICS280PG ✓ 啟用中ICS280PG 概覽
A clock generator is a timing IC that converts a single reference input into multiple synchronized output clocks. A clock synthesizer adds phase-locked loop (PLL) multiplier and divider stages so one low-frequency crystal or clock reference can drive many higher or lower frequency domains. A spread spectrum clock generator additionally dither the output edge position over time, spreading electromagnetic energy across a band and reducing peak radiated emissions. The ICS280PG combines all three functions in one device: reference conditioning, triple-PLL synthesis, and four-way clock fanout with spread spectrum modulation.
Key features of the ICS280PG include three independent PLL blocks with a bypass mode, up to four CMOS outputs, a maximum output frequency of 200 MHz, and field programmability of the synthesis and modulation parameters. Accepting either a crystal or an external clock as reference, the device lets a designer change output frequencies and modulation profiles without changing the board layout. Its 16-TSSOP body keeps the footprint compact enough for cost-sensitive consumer, industrial and networking equipment while supporting surface-mount assembly at line speed.
Architecturally the part pairs a programmable reference stage with three PLL multipliers and dividers feeding four CMOS output buffers. Because each PLL can be bypassed, the same device can pass the reference through unmodified for one clock domain while synthesizing two additional domains, which simplifies clock tree design in systems that mix legacy and modern clock requirements. CMOS output drive gives rail-to-rail compatible levels for downstream CMOS logic, and spread spectrum modulation reduces the spectral peak of the fundamental without changing the average output frequency.
Typical applications include server and storage platform clock trees, set-top box and digital set-top clocking, networking equipment with multiple clock domains, industrial control modules, and any consumer or embedded product where radiated emissions must be reduced to meet EMC limits while keeping a single reference source.
When designing around the ICS280PG, treat the reference input and output routing as a controlled-impedance clock network and check the datasheet pin description table before assigning tracks; spread spectrum modulation only reduces emissions if the downstream traces and connectors do not act as antennas.
This page adds practical context that a manufacturer datasheet alone does not provide: a parameter-by-parameter comparison table, drop-in ordering alternatives with the temperature and packaging differences made explicit, and design notes covering PLL bypass, spread spectrum settings and EMI verification practice.
直接替換替代品，適用於 ICS280PG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
ICS280PGIT
✅ 直接替換📋 參考替代品（不在目錄中）
ICS280PGT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ICS280PGILFT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
280PGILFT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ICS280PG 規格
| Device Type | Clock/Frequency Synthesizer, Fanout Distribution, Spread Spectrum Clock Generator |
| Architecture | Triple PLL field programmable spread spectrum clock synthesizer |
| Maximum Output Frequency | 200 MHz |
| 輸出數量 | 4 |
| PLL | Yes, with bypass |
| Input Type | Clock, Crystal |
| 輸出類型 | CMOS |
| 封裝 | 16-TSSOP (0.173 in, 4.40 mm width) |
| 腳位數 | 16 |
| 安裝類型 | Surface Mount |
| Programmability | Field programmable |
| Spread Spectrum | Modulated output for EMI reduction |
ICS280PG 16-tssop (0.173 in, 4.40 mm width) 腳位配置指南
ICS280PG（16-tssop (0.173 in, 4.40 mm width) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ICS280PG.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICS280PG 適用於 6 應用s: Server and Storage Platform Clock Tree, Set-Top Box and Digital Media Clocking, Networking and Communications Equipment, Industrial Control and Instrumentation, EMI Mitigation for Consumer and Embedded Products, Test and Measurement Instrumentation.
Server and Storage Platform Clock Tree
The ICS280PG fits server, storage and networking platforms where one low-frequency crystal must feed several unrelated clock domains. Its three PLL blocks multiply and divide the reference while offering a bypass path, so a legacy domain can receive the reference untouched while two other domains are synthesized at their own frequencies, all from a 16-TSSOP footprint that keeps routing short. With up to four CMOS outputs at a maximum of 200 MHz, the part covers processor, fabric and SerDes reference requirements from one device. Spread spectrum modulation dithers the edge position and lowers the spectral peak of the fundamental, which directly helps a dense chassis meet radiated emission limits without adding a separate dithering circuit.
推薦
Set-Top Box and Digital Media Clocking
Consumer set-top and digital media equipment is cost sensitive and EMI sensitive at the same time, which is exactly where the ICS280PG helps. A single crystal reference is conditioned and multiplied by the internal PLLs, then distributed across up to four CMOS outputs running at up to 200 MHz, so the main processor, video pipeline and memory controller can each be fed from one small package. Because the device is field programmable, output frequencies and modulation profiles can be tuned during production without respin. Spread spectrum operation reduces the peak radiated emission from long ribbon cables and connectors, which is often the deciding factor in passing a conducted plus radiated emissions scan on a tight schedule.
推薦
Networking and Communications Equipment
Ethernet switches, routers and industrial gateways need multiple deterministic clocks derived from a single stable reference, and the ICS280PG delivers that with three PLLs and four CMOS outputs in a 16-TSSOP package. Because each PLL block can be bypassed, a design can keep one output at the reference frequency for legacy PHY interfaces while synthesizing two higher rates for switching fabric and SerDes paths. CMOS output levels integrate directly with modern network processors, and the 200 MHz ceiling covers typical 100 MHz and 125 MHz interface domains. Spread spectrum modulation is valuable in rack-mounted products where long backplane traces and connectors radiate, since lowering the spectral peak buys margin on emissions without altering the nominal clock frequency.
推薦
Industrial Control and Instrumentation
Industrial controllers and measurement instruments often combine a slow crystal reference with fast internal buses, and the ICS280PG bridges that gap with programmable multiply and divide stages feeding up to four CMOS outputs at a maximum frequency of 200 MHz. The bypass capability lets a legacy interface keep the raw reference while other domains are synthesized, reducing the number of discrete oscillators a ruggedized design has to carry. Field programmability means frequency plans can be adjusted to match different sensor and converter combinations across a product family. For equipment sold into markets with strict immunity and emission limits, the modulated output lowers the conducted and radiated signature of the clock itself, which reduces the need for extra filtering around sensitive analog sections.
推薦
EMI Mitigation for Consumer and Embedded Products
Spread spectrum clocking is a structural fix rather than a filtering fix, and the ICS280PG applies it in a single 16-TSSOP device. By dithering the clock edge over time, the fundamental energy is spread across a band, lowering the peak level that a radiated emissions scan measures at a quasi-peak detector. That makes the part useful in flat-panel, appliance and embedded consumer products where a narrowband clock line on a long trace behaves like a small antenna. The device still delivers four CMOS outputs up to 200 MHz, so the clock tree stays consolidated, and because the modulation is field programmable the spreading percentage can be tuned during bring-up to find the best balance between emissions margin and added jitter for the downstream receivers.
推薦
Test and Measurement Instrumentation
Bench instruments and automated test equipment need several related but independent clocks, and the ICS280PG consolidates them into one small package. A single crystal reference feeds the three PLL blocks, each with its own multiply and divide settings and its own bypass path, and the four CMOS outputs distribute the results to the trigger, ADC sampling, DAC update and communications sections of the instrument. With a 200 MHz maximum output frequency there is headroom for sampling and modulation clocking, and the compact 16-TSSOP footprint keeps the clock network away from sensitive analog front ends. Field programmability also allows the same board to be reconfigured for different sampling rates in the field, which simplifies platform reuse across product variants.
推薦
推薦產品摘要
工程參考資料，適用於 ICS280PG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ICS280PGIT | ICS280PGT | ICS280PGILFT | 280PGILFT |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 16-TSSOP (0.173 in, 4.40 mm) | 16-TSSOP (0.173 in, 4.40 mm) - same | 16-TSSOP (0.173 in, 4.40 mm) - same | 16-TSSOP (0.173 in, 4.40 mm) - same | 16-TSSOP (0.173 in, 4.40 mm) - same |
| Device Type | Clock/Frequency Synthesizer, Fanout Distribution, Spread Spectrum Clock Generator | Clock/Frequency Synthesizer, Fanout Distribution, Spread Spectrum Clock Generator | Clock/Frequency Synthesizer, Fanout Distribution, Spread Spectrum Clock Generator | Triple PLL field programmable spread spectrum clock synthesizer | Triple PLL field programmable spread spectrum clock synthesizer |
| Maximum Output Frequency | 200 MHz | 200 MHz | 200 MHz | 200 MHz | 200 MHz |
| Number of Outputs | 4 | 4 | 4 | 4 | 4 |
| PLL Configuration | Triple PLL with bypass | Triple PLL with bypass | Triple PLL with bypass | Triple PLL with bypass | Triple PLL with bypass |
| Input Type | Clock, Crystal | Clock, Crystal | Clock, Crystal | Clock, Crystal | Clock, Crystal |
| Output Type | CMOS | CMOS | CMOS | CMOS | CMOS |
| Temperature Grade / Packing | Standard ordering code | Industrial temperature, tape and reel | Industrial temperature, tube packing | Industrial temperature, lead-free tape and reel ordering code | Industrial temperature, shortened ordering code |
主要差異化特點
- Three independent PLL blocks with bypass in one 16-TSSOP package (對比ICS280PGT)
- Field programmable spread spectrum modulation in a clock synthesizer (對比280PGILFT)
- Four CMOS outputs from a single reference with crystal or clock input (對比ICS280PGILFT)
- PLL bypass preserves the reference for legacy domains (對比ICS280PGIT)
設計說明
Route all four clock outputs as short, matched-length traces on a continuous reference plane. Keep the reference crystal or oscillator connection to the input pins as short as possible and away from the spread spectrum outputs, because the modulation edges dither the transition point and any coupling of output current back into the reference node turns into phase noise on every domain at once. Provide a solid ground return directly under the device so the CMOS output switching current has a low-impedance path.
Spread spectrum only helps when the whole clock path is controlled. After programming the modulation percentage, verify the radiated emission plot rather than assuming improvement, because long ribbon cables, connectors and cable stubs can resonate and re-concentrate the energy that the spreading was meant to disperse. Measure both the fundamental and the first few harmonics at the quasi-peak detector setting used by your compliance standard, and adjust the modulation depth before changing any shielding.
Decouple each supply pin locally with a high frequency ceramic placed between the supply and ground pins, plus a bulk capacitor close to the device. Estimated supply current scales with output activity, so the more of the four CMOS outputs that toggle at 200 MHz, the more switching energy the package must dissipate; budget for the highest expected toggle rate rather than the average clock frequency. Keep the bypass loop area minimal so the inductance in the loop does not detune the supply at the modulation edges.
Do not treat the PLL bypass as a no-cost option. In bypass mode the output follows the reference directly, so any reference jitter, drift or poor crystal quality passes through untouched to the downstream circuit. Decide per domain whether the bypassed path is acceptable, and confirm that the programmed multipliers and dividers land inside the valid operating envelope of each PLL block rather than assuming any frequency combination is legal.
Adding spread spectrum introduces deterministic jitter that is proportional to the modulation rate and depth. Check that the total added jitter still fits the receiver budget of the device fed by the clock, especially on interfaces such as high-speed serial links where the receive eye is tight. If margin is short, reduce the modulation percentage or move the spreading to a lower frequency domain rather than disabling it entirely.
合規資訊
The device is described as a clock/frequency synthesizer with fanout distribution and spread spectrum capability in a 16-TSSOP package. No RoHS, REACH, lead-free or automotive qualification statements are published on the listing pages for this part, so these fields are recorded as unknown rather than assumed.
