ICS570B - 170 MHz 3.3 V PLL Clock Buffer | Renesas
MPN： ICS570B ✗ 停產ICS570B 概覽
A zero-delay buffer is a clock-integrity device that uses phase-locked-loop techniques to reproduce an input clock at its outputs with very small propagation delay relative to the source clock. It belongs to the clock and timing hierarchy of clock generators, PLL multipliers, fanout buffers, clock drivers and zero-delay buffers. The ICS570B is intended for systems where several logic domains require related clocks without introducing significant inter-clock skew.
The ICS570B supports output clock frequencies up to 170 MHz at 3.3 V and can select between 14 multiplication ratios from 0.5x to 32x. It also includes fanout distribution, spread-spectrum clock generation and the ability to recover a degraded input-clock duty cycle. The maximum input-to-output skew is 300 ps for output rates above 60 MHz, making it useful for high-speed communications, storage, networking and processor clock trees.
Internally, the device uses analog/digital PLL techniques rather than a simple static clock buffer. This architecture allows one reference clock to be multiplied and distributed while limiting output-to-output skew. The published family information also identifies the B version as the 3.3 V option and the A version as the 5 V option, making supply-voltage compatibility a critical selection criterion when comparing family members.
Typical uses include frequency multiplication for a CPU or bus clock, fanout to multiple peripheral clock domains, spread-spectrum clock generation for reducing electromagnetic interference, and duty-cycle restoration of a degraded source clock. The 8-pin SOIC package supports conventional surface-mount assembly and keeps the footprint compact for clock-distribution sections on communication, industrial and computing boards.
Designers should verify the input and output reference clock requirements, the selected multiplication ratio, output termination and load capacitance against the Renesas 570 datasheet before layout. Keep clock traces short and match trace lengths where output-to-output skew is critical. Provide a continuous ground reference under the device and place decoupling capacitors close to the supply pins.
This page consolidates verified manufacturer and distributor information, published price references, family-level drop-in options and practical clock-tree design guidance. It also identifies where application-specific data, such as exact supply current, temperature range and production lifecycle status, must be confirmed against current manufacturer documentation.
直接替換替代品，適用於 ICS570B — 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： ICS570B （相同外形與佔位） — 差異在於 Package, Product Type.
ICS570
✅ 直接替換📋 參考替代品（不在目錄中）
ICS570A
✅ 直接替換聯絡詢價
查看資料表 →ICS570M
✅ 直接替換📋 參考替代品（不在目錄中）
ICS570B 規格
| Product Type | Fanout distribution, spread-spectrum clock generator and zero-delay buffer |
| Clock Generator Architecture | Proprietary analog/digital phase-locked loop |
| Maximum Output Clock Frequency | 170 MHz |
| Recommended Supply Voltage | 3.3 V |
| Multiplication Ratios | 0.5x to 32x, 14 selectable ratios |
| Maximum Input-to-Output Skew | 300 ps maximum for outputs above 60 MHz |
| 封裝 | 8-pin SOIC, 0.154 in (3.90 mm) width |
| 安裝類型 | Surface mount |
| Input Duty-Cycle Recovery | Supported |
| Fanout Function | Supported |
| Spread-Spectrum Clock Generation | Supported |
| Output Frequency at 3.3 V | Up to 170 MHz |
| Termination Condition | 27 ohm termination resistor with 15 pF loads on CLK and CLK/2, typical jitter measurement at 25 C |
ICS570B 8-pin soic, 0.154 in (3.90 mm) width 腳位配置指南
ICS570B（8-pin soic, 0.154 in (3.90 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： ICS570B.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICS570B 適用於 6 應用s: Processor Clock Multiplication, Networking and Communications Clock Fanout, Spread-Spectrum EMI Reduction, Degraded Clock Duty-Cycle Recovery, Industrial Data-Acquisition Backplane, Storage and Interface Clock Trees.
Processor Clock Multiplication
The ICS570B is suitable when a board receives a lower-frequency reference clock but requires a multiplied operating clock for a processor, controller or high-speed interface. Its PLL architecture provides 14 selectable multiplier ratios from 0.5x to 32x and supports output frequencies up to 170 MHz at 3.3 V. Compared with a static buffer, the device adds multiplication, fanout and duty-cycle recovery in one 8-pin SOIC package. The trade-off is PLL-related jitter and power consumption, so the output ratio should be selected to minimize unnecessary multiplication and the source clock should be characterized for cycle-to-cycle jitter before layout is released.
推薦
Networking and Communications Clock Fanout
Communications boards often require one reference clock to feed parallel interfaces, transceivers or memory controllers with closely related frequencies. The ICS570B provides fanout and multiplication in a single PLL-based zero-delay buffer, with a maximum input-to-output skew of 300 ps for output rates above 60 MHz. That makes it appropriate where several clock domains must follow one frequency relationship. Place the device near the source and loads, match output routes where skew matters and confirm the 15 pF/27 ohm characterization condition used for the published jitter tables before extrapolating to a different load.
推薦
Spread-Spectrum EMI Reduction
ICS570B explicitly supports spread-spectrum clock generation, making it applicable to systems where radiating harmonics from a fixed-frequency clock create electromagnetic-compatibility problems. Spreading the clock energy over a range of frequencies can reduce the peak level in a narrow measurement band and improve EMI margins without changing the nominal clock frequency. The device can also fan out the resulting clock to several loads. Because the verified excerpts do not provide modulation range or rate, those values must be confirmed in the Renesas 570 datasheet, and the result should be validated with the final PCB, cables and enclosures.
推薦
Degraded Clock Duty-Cycle Recovery
The ICS570B can recover a degraded input-clock duty cycle, making it useful when a remote or power-distribution-heavy source produces a waveform that is functional but not ideal for downstream PLL-based circuitry. The internal analog/digital PLL reshapes and redistributes the clock while offering fanout and multiplication functions. This avoids adding a separate duty-cycle correction stage when the same device can also serve downstream logic. The correction quality still depends on the input frequency and duty-cycle limits listed in the 570 datasheet, and the recovered clock should be measured at the load with realistic termination.
推薦
Industrial Data-Acquisition Backplane
In an industrial data-acquisition or control backplane, several converters, transceivers and analog front ends may need related clock phases. The ICS570B's 170 MHz maximum output, selectable 0.5x-to-32x multiplication and 300 ps maximum skew specification above 60 MHz allow one reference to serve multiple deterministic domains. Use short, impedance-controlled traces and isolate the clock from switching regulators and high-current outputs. If the system must operate across wide industrial temperatures, verify the available ICS570B temperature grade because that limit was not present in the retrieved excerpts.
推薦
Storage and Interface Clock Trees
Storage controllers, serializers and parallel-to-serial interface blocks frequently need a low-skew clock derived from a common reference. ICS570B can multiply, fan out and duty-cycle-correct that reference while keeping the implementation to an 8-pin SOIC package. The 170 MHz output ceiling covers many legacy memory and interface clock domains, although the exact multiplier and output configuration must be validated against the system timing budget. Account for PLL jitter and board skew in addition to the 300 ps device input-to-output figure, and avoid treating that specification as a complete end-to-end timing budget.
推薦
推薦產品摘要
工程參考資料，適用於 ICS570B — 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 | ICS570 | ICS570A | ICS570M |
|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Device Function | PLL multiplier, zero-delay buffer, fanout and spread-spectrum clock generator | ICS570 family multiplier and zero-delay buffer | ICS570 family multiplier and zero-delay buffer | Pin-for-pin replacement and upgrade to ICS570B |
| Drop-In Relationship | Reference device | Pin-for-pin replacement or upgrade | Pin-for-pin replacement or upgrade; 5 V version | Pin-for-pin replacement and upgrade |
主要差異化特點
- Three clock-management functions in one package (對比ICS570)
- Direct 3.3 V family device (對比ICS570A)
- Documented pin-for-pin upgrade path (對比ICS570M)
設計說明
Place the ICS570B near the reference clock and the loads it drives. Keep each output trace short, avoid stubs and test-point branches where possible, and match output routing where multiple outputs must retain a tight phase relationship. Route clock nets away from switching-regulator inductors and high-current return paths. For a multilayer PCB, provide a continuous ground reference below the SOIC and use the manufacturer's recommended via geometry to maintain a predictable return path.
Validate the actual output waveform at the receiver with the production load, termination and board configuration. The published jitter characterization for ICS570B used a 27 ohm termination resistor and 15 pF loads on CLK and CLK/2 at 25 C, so results obtained with materially different loading should not be assumed to match. Include device jitter, PLL multiplication ratio, trace length mismatch and downstream receiver tolerance in the end-to-end timing budget rather than relying only on the 300 ps input-to-output skew figure.
The B version is intended for 3.3 V operation, so do not substitute a 5 V family member into a fixed 3.3 V rail without verifying its supply pins and absolute maximum ratings. Place bypass capacitors close to the supply and ground connections, and confirm the datasheet's recommended capacitance and voltage-rating requirements. Because the verified excerpts did not include supply current, derive regulator capacity from the current manufacturer specification and the selected multiplier ratio before finalizing the power tree.
Do not treat every functionally similar clock device as a mechanical replacement. The published cross-reference data explicitly states that AV9170 is a functional equivalent but not a pin-for-pin replacement. Verify the enable structure, reference-clock input, available multiplier settings, output drive strength and supply rails for every proposed substitute. Likewise, confirm the exact 570 datasheet revision for production use rather than relying on third-party HTML copies or distributor summaries.
合規資訊
The verified excerpts identify the ICS570B as an 8-pin SOIC clock IC but do not provide explicit RoHS, REACH, halogen-free, conflict-minerals or AEC-Q100 statements. One third-party distributor listing references older lead and RoHS status, but that result was not used because it does not reflect an authoritative current manufacturer declaration.
