ICS308RI - 200MHz Quad-PLL Clock Synthesizer | Renesas
MPN： ICS308RI ✓ 啟用中ICS308RI 概覽
A PLL clock synthesizer is a clock-and-timing semiconductor that generates, divides, multiplies, and phases a reference clock to produce one or more stable output frequencies. The quad-PLL architecture expands this role into a multi-output clock-generation hub. In system terms, the ICS308RI belongs to the PLL synthesizer family, clock-generation ICs, clock-and-timing ICs, and the broader integrated-circuit and semiconductor hierarchy.
The principal feature is simultaneous generation of up to six output frequencies across a 250 kHz to 200 MHz range. Serial programmability allows system designers to configure divider ratios and output relationships instead of relying on a fixed-frequency oscillator. This makes the ICS308RI useful when several clock domains require independent or related rates while sharing one reference source. Its four internal PLL channels provide more configuration flexibility than a basic single-output clock generator.
The ICS308RI is specified as a clock/frequency synthesizer IC with a maximum frequency of 200 MHz. The manufacturer documentation identifies the device as a serial-programmable quad-PLL VersaClock synthesizer, which describes both its programming interface and its four-PLL architecture. Its 20-pin SSOP package supports surface-mount PCB assembly and preserves a relatively compact board footprint for multi-clock systems.
Typical applications include communications equipment, networking infrastructure, industrial control systems, data-conversion equipment, and embedded systems that need several internally related clock outputs. A single reference clock can be multiplied and divided to support multiple converters, processors, or interface blocks. The ability to produce six frequencies simultaneously can simplify clock-tree design and reduce the number of separate synthesis devices required on a board.
When integrating the ICS308RI, verify the reference-clock range, supply requirements, programming interface, output-drive characteristics, and output-frequency limits against the manufacturer datasheet before finalizing the PCB. Preserve short, controlled traces around the clock inputs and outputs, provide the required bypass capacitors, and account for output jitter when routing sensitive clock signals.
This page organizes the ICS308RI core specifications, application guidance, pin-package information, and drop-in replacement information into a design-focused resource for engineers evaluating programmable clock-generation architectures.
直接替換替代品，適用於 ICS308RI — 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。
此系列的變體
與下列產品可直接替換的同系列型號： ICS308RI （相同外形與佔位） — 差異在於 Architecture, Device Type, PLL Count.
ICS308RI 規格
| Device Type | Clock/Frequency Synthesizer IC |
| Architecture | Quad-PLL VersaClock synthesizer |
| Configuration Interface | Serial programmable |
| Maximum Output Frequency | 200 MHz |
| Minimum Output Frequency | 250 kHz |
| Simultaneous Output Frequencies | Up to 6 |
| PLL Count | 4 |
| Package Type | 20-SSOP |
| Package Width | 3.90 mm |
| Package Width, Imperial | 0.154 inch |
| 腳位數 | 20 |
| 安裝類型 | Surface mount |
ICS308RI 0.154 inch 腳位配置指南
ICS308RI（0.154 inch 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： ICS308RI.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICS308RI 適用於 6 應用s: Network Interface Clocking, Communications Equipment, Industrial Control Systems, Data-Acquisition and Conversion, Embedded Processor Platforms, Test and Measurement Instrumentation.
Network Interface Clocking
The ICS308RI fits network-interface clocking because its four PLL channels and as many as six simultaneous outputs can derive multiple related frequencies from one reference source. The 250 kHz to 200 MHz range covers low-speed management clocks through high-speed digital interface requirements. Place the synthesizer near the clock-consuming circuits, route outputs as controlled 50-ohm transmission lines, and program divider ratios that preserve each receiver's required setup and hold margins.
推薦
Communications Equipment
The ICS308RI is appropriate for communications equipment that requires several clock domains from a common reference. Four PLL channels offer the architecture for generating up to six frequencies simultaneously, while the 200 MHz ceiling supports demanding digital blocks. Design the reference input for low jitter, isolate noisy circuitry from clock supplies, and validate startup sequencing so that downstream transmitters, receivers, and processors do not receive out-of-range clocks during initialization.
推薦
Industrial Control Systems
The ICS308RI can organize the clock tree in an industrial control system by supplying several deterministic frequencies to processors, converters, communication controllers, and timing peripherals. The 250 kHz to 200 MHz span accommodates both low-rate supervisory clocks and faster processing domains. Before release, verify the operating-temperature and electrical limits in the manufacturer datasheet, then use independent reset or enable control downstream to prevent incorrect data transfer during power-up.
推薦
Data-Acquisition and Conversion
The ICS308RI is useful in data-acquisition and signal-conversion systems that need coherent sampling and processing clocks. Multiple derived outputs can support converter sample rates, digital filters, interface bridges, and control logic without deploying separate oscillators. The programmable architecture allows output frequencies to be related mathematically, which simplifies clocking schemes requiring a fixed ratio. Confirm jitter, output-drive capability, and maximum clock frequency against the particular converter and isolation architecture before layout release.
推薦
Embedded Processor Platforms
The ICS308RI fits embedded processor platforms that require peripheral, bus, and communication clocks derived from one stable reference. Its serial programming interface allows firmware or a boot controller to configure output relationships, and the six-output capability can simplify platform clock distribution. Keep the programming bus away from sensitive clock traces, establish a deterministic startup order, and verify that every enabled output reaches its intended frequency before releasing downstream reset signals.
推薦
Test and Measurement Instrumentation
The ICS308RI can provide programmable clock outputs for test and measurement instruments that need several coordinated rates in one design. The 250 kHz to 200 MHz range supports low-rate control functions and faster sampling or processing chains. Use independent output enables where available and confirm that programming changes do not create unacceptable transients on sensitive loads. Layout should minimize coupling between outputs and sensitive analog sections to preserve measurement quality.
推薦
推薦產品摘要
工程參考資料，適用於 ICS308RI — 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 | ICS308R | ICS308 |
|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 20-SSOP | 20-SSOP | 20-SSOP |
| Device Type | Clock/Frequency Synthesizer IC | Clock/Frequency Synthesizer IC | Serial Programmable QUAD PLL Versaclock Synthesizer |
| Architecture | Quad-PLL | Quad-PLL | Quad-PLL |
| Simultaneous Output Frequencies | Up to 6 | Up to 6 | Up to 6 |
| Configuration Interface | Serial programmable | Serial programmable | Serial programmable |
主要差異化特點
- Documented terminal and package compatibility (對比ICS308R)
- Four-PLL multi-output architecture (對比ICS308)
- Broad programmable frequency coverage (對比ICS308R)
設計說明
Place the ICS308RI close to the clock-consuming circuits and keep the reference input, serial interface, and clock outputs on controlled routing. Use the shortest practical paths for clock nets, avoid crossing them with high-current switching paths, and provide a continuous ground reference beneath the device. If output frequency changes during operation, analyze the transient at each receiver rather than assuming every interface tolerates a new edge at the same instant.
Decouple the supply pins in accordance with the manufacturer datasheet and keep the high-frequency return path close to each capacitor connection. Separate the reference-clock source from switching-converter return currents where possible. Validate startup by observing all enabled outputs after programming; incorrect divider or configuration values can create a valid clock at an unintended frequency rather than an obvious lack of clock.
Do not infer a complete pinout from a similar PLL device. Use the ICS308RI pin-description table to assign VDD, ground, reference inputs, serial data, clock outputs, and any enable or test terminals. Similarly, confirm that a proposed replacement uses the same 20-SSOP terminal arrangement and programming behavior; package similarity alone does not prove that every pin has the same signal function.
Budget clock jitter for the complete signal path, including the reference oscillator, ICS308RI output, PCB loading, and receiving device. Match output connections to the expected impedance and avoid unnecessary stubs or test-point branches on high-frequency clock nets. When multiple outputs drive dissimilar loads, evaluate rise time, edge distortion, and crosstalk independently because one device configuration does not guarantee equal signal integrity on every output.
合規資訊
The manufacturer datasheet identifies the ICS308RI as a clock/frequency synthesizer IC; no explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was identified for this exact ordering code.
