ICS570A - 170MHz Zero Delay Buffer | Renesas | Clocking
Teilenummer: ICS570A ✓ AktivICS570A Übersicht
A zero-delay buffer is a clock-integrity device that reproduces an input clock at one or more outputs while compensating for internal propagation delay through a phase-locked-loop technique. ICS570A uses Integrated Circuit Systems proprietary analog/digital PLL techniques, allowing the device to provide low input-to-output skew while distributing or multiplying the source clock. The part is therefore positioned between a clock source and the digital circuits, processors, or memory that require synchronized clock signals.
Key documented features include support for 14 multiplier choices from 0.5x to 32x, output clock frequency up to 170 MHz at 5 V, and the ability to recover degraded input clock duty cycle. The listed low input-to-output skew is 300 ps maximum for outputs above 60 MHz. The device is also identified as functionally equivalent to the AV9170, although the manufacturer explicitly notes that the AV9170 is not a pin-for-pin replacement.
Typical uses include processor and controller clock generation, communication-system clock distribution, memory clocking, retrofit or modernization of older clock architectures, and any board requiring a multiplied or buffered reference clock. The ICS570A should be selected when the surrounding circuit requires a 5 V zero-delay buffer and an 8-pin SOIC footprint. The B version or another device should be considered when the system operates from 3.3 V, because the A and B versions target different supply voltages.
Designers should preserve the manufacturer's recommended input, output, termination, and load conditions. Clock jitter and skew tables depend on the termination resistance and load capacitance, so a replacement must be checked against the original clock topology rather than selected only by package. This page combines the verified manufacturer and distributor information with a conservative drop-in assessment, clearly separating confirmed replacements from parts that are only functionally equivalent.
Drop-in-Alternativen für ICS570A – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ICS570A (gleiche Bauform und Footprint) – abweichend in Package, Product Type.
ICS570M
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ICS570B
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →ICS570A Technische Daten
| Product Type | Multiplier and Zero Delay Buffer |
| Manufacturer | Renesas Electronics Corporation |
| Supply Voltage Version | 5 V version |
| Maximum Output Clock Frequency | 170 MHz |
| Multiplier Choices | 14 choices from 0.5x to 32x |
| Input-to-Output Skew | 300 ps maximum for outputs above 60 MHz |
| Clock Architecture | Analog/digital PLL-based zero-delay buffer |
| Output Functions | Clock multiplication and fanout distribution |
| Input Clock Duty-Cycle Recovery | Supported |
| Gehäuse | 8-pin SOIC, 0.154 inch body width, 3.90 mm width |
| Montageart | Surface mount |
| Lead-Free Package | Available for A and B versions |
| Manufacturer Document Identifier | 570 datasheet |
| Jitter Measurement Temperature | 25 °C |
| Jitter Test Termination | 27 ohm termination resistor |
| Jitter Test Load | 15 pF on both CLK and CLK/2 |
ICS570A available for a and b versions Pinbelegungsleitfaden
Pinbelegung für ICS570A (available for a and b versions-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für ICS570A.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ICS570A ist geeignet für 6 Anwendungs: Processor Clock Generation, Memory Clock Distribution, Communication Equipment Clocking, Industrial Control Clock Hub, Legacy Clock Architecture Upgrade, Timing Reference Fanout.
Processor Clock Generation
The ICS570A is appropriate when a processor requires a multiplied or buffered clock derived from a lower-frequency reference. Its PLL-based zero-delay architecture supports 14 multiplier choices from 0.5x to 32x and output frequencies up to 170 MHz, allowing the reference relationship to be selected around the processor clock requirement. The 300 ps maximum input-to-output skew above 60 MHz provides a defined timing target for clock-distribution paths. In a practical implementation, the reference feeds the ICS570A and the selected divided or multiplied output drives the processor clock input. The engineer should verify the processor's permitted clock topology, maximum frequency, jitter tolerance, input capacitance, and required voltage before finalizing the design.
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Memory Clock Distribution
The ICS570A can distribute a related clock to memory-facing circuitry where clock phase consistency is important. Its zero-delay function is intended to reduce the timing offset between input and output, while the multiplier range from 0.5x to 32x allows several clock relationships to be derived from one reference. The verified maximum output frequency is 170 MHz, but usable memory-clock rate remains governed by the memory device and board topology. In use, the source clock is applied to the ICS570A and an appropriate output is routed to the memory clock pins. The design must account for output loading, trace length, termination, return-path continuity, and the destination device's allowable jitter and skew.
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Communication Equipment Clocking
ICS570A fits communication equipment that needs a stable, distributed clock for serial links, controllers, or interface logic. The 170 MHz maximum output frequency provides ample range for common digital subsystems, while the PLL-based zero-delay approach helps maintain a controlled relationship between the reference and outgoing clocks. A system can feed one reference into the device and use the supported multiplier selections to create the required clock domains. For reliable deployment, engineers should confirm that the reference remains within the device's operating limits and that the output jitter, duty cycle, skew, and load capacitance comply with the receiving circuitry. The 27 ohm and 15 pF conditions used for the manufacturer's jitter tables provide useful comparison points.
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Industrial Control Clock Hub
The ICS570A is suitable as a clock hub in industrial control equipment where several digital subsystems must derive related clocks from a common source. Its fanout-distribution and multiplier functions allow a single reference to support different clock ratios, while the zero-delay architecture limits propagation offset. This can simplify clock planning in controller boards containing processors, logic, transceivers, and data-conversion circuits. The implementation should preserve short, controlled clock paths and use the same loading assumptions used during timing verification. Because industrial environments can include temperature variation and long-lived production programs, engineers should also review the complete manufacturer timing tables, device qualification information, and lifecycle status rather than relying only on the headline frequency rating.
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Legacy Clock Architecture Upgrade
ICS570A is relevant to legacy-system upgrades where an existing board uses a 5 V multiplier and zero-delay buffer and needs a documented upgrade path. The manufacturer identifies the ICS570M as a pin-for-pin replacement and upgrade to the ICS570 family, making it the strongest verified option for preserving the footprint. Engineers can compare timing tables, output configurations, jitter, and supply requirements before deciding whether to retain ICS570A or migrate. A footprint-compatible part is not automatically timing-compatible, so the replacement review must include worst-case skew and jitter at the actual operating frequency. Board bring-up should include clock-amplitude, duty-cycle, and phase checks at every connected output.
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Timing Reference Fanout
The ICS570A can fan out a timing reference to multiple circuit blocks while maintaining a defined relationship between the input and outputs. This application is useful in test, measurement, and mixed-signal systems where several subsystems must not accumulate arbitrary clock phase differences. The zero-delay PLL technique is intended to compensate internal propagation delay, while the selectable multipliers support both divided and increased clock rates. The board implementation should use controlled impedance, short stubs, and appropriate output loading to avoid introducing reflections that the IC specifications do not represent. Engineers should compare the manufacturer's skew and jitter tables at the actual frequency and termination. The published jitter tables use a 27 ohm termination and 15 pF load on both CLK and CLK/2 at 25 °C.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ICS570A – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ICS570M | ICS570B |
|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Product Type | Multiplier and Zero Delay Buffer | ICS570-family clock device | Multiplier and Zero Delay Buffer |
| Replacement Status | Original target device | Manufacturer-stated pin-for-pin replacement and upgrade | Same-family voltage variant; pin-for-pin status not explicitly confirmed in supplied data |
Wichtigste Unterscheidungsmerkmale
- Original 5 V-specific family option with a defined 170 MHz output rating (vs. ICS570B)
- Confirmed manufacturer-supported upgrade path (vs. AV9170)
- Broad clock-ratio flexibility in an 8-pin SOIC (vs. ICS570M)
Designhinweise
Route the reference clock and all clock outputs as short, controlled-impedance traces with continuous reference planes. Avoid long stubs and unnecessary test-point branches because their capacitive loading can change rise time, duty cycle, and the jitter observed by downstream devices. Place the device close to the clock-consuming circuitry when output timing is critical. Maintain the return path beneath each clock trace, and use the manufacturer's specified output termination and load conditions when validating timing.
Compare clock jitter and skew under identical conditions rather than comparing isolated headline numbers. The verified ICS570A jitter tables use a 27 ohm termination resistor and 15 pF loads on both CLK and CLK/2, measured at 25 °C. If the PCB presents a different load or termination, repeat the timing evaluation with the final layout. This is especially important for any ICS570M substitution because package compatibility alone does not guarantee identical jitter under changed conditions.
Follow the manufacturer's 5 V supply and decoupling recommendations for the A version. Because ICS570A is the 5 V family member, do not substitute ICS570B into a 5 V design without reviewing its complete electrical limits and control behavior. Provide a low-impedance supply connection and place the specified bypass capacitors close to the device. Validate supply ripple, startup behavior, and clock stability over the intended input frequency and multiplier range.
Do not classify the AV9170 as a drop-in ICS570A replacement. The verified manufacturer information calls it functionally equivalent but explicitly says it is not pin-for-pin compatible. Use ICS570M as the documented upgrade path, and verify every pin, mode setting, output function, voltage level, frequency limit, and timing characteristic before release. A zero-delay buffer does not remove the need to control impedance, loading, termination, and clock-source quality.
Compliance-Informationen
The verified ICS570 family information states that a lead-free package is available for the A and B versions. RoHS, REACH, halogen-free, conflict-minerals, and AEC-Q100 statuses were not established by the supplied sources.
