ICS508M - 250 MHz PECL-to-CMOS Clock Converter | Renesas
부품 번호: ICS508M ✓ 활성ICS508M 개요
A clock converter is a clock-and-timing IC used to bridge incompatible electrical interfaces while preserving the timing information of a periodic signal. Within the broader hierarchy, a clock converter belongs to clock generation and timing ICs, alongside clock buffers, clock multipliers, dividers, phase-locked loops, and distribution devices. The ICS508M is specifically a logic-level conversion device rather than a frequency synthesizer, so its main function is interface translation instead of frequency multiplication or division.
The verified headline characteristics are a maximum operating frequency of 250 MHz, PECL input, CMOS output, a 1:1 input-to-output ratio, no PLL, and one clock circuit. These features make the ICS508M useful when a system contains a high-speed PECL clock source but the receiving logic requires a CMOS-compatible clock. The 1:1 relationship means the converter does not intentionally change the fundamental clock frequency while transferring it between the two logic families.
The ICS508 uses separate supply connections for its input and output sections, a characteristic that helps the two interfaces operate in their respective voltage domains. The manufacturer documentation also identifies the ICS508 as a cost-effective method for producing a high-frequency CMOS clock from a PECL source. Exact supply-voltage tolerances, input-output delay, output jitter, rise and fall time, temperature range, and package dimensions beyond the stated width were not available in the supplied verified data and therefore require confirmation from the manufacturer datasheet.
Typical clock-converter applications include high-speed digital backplanes, telecommunications timing interfaces, FPGA or ASIC clock-interface conversions, and legacy systems that mix ECL-family clocking with CMOS logic. The ICS508 can also be evaluated for instrumentation and test systems where a PECL oscillator is available but the destination device expects a CMOS clock. In every case, the source and destination logic levels, voltage rails, edge-rate requirements, and system timing budget must be checked before implementation.
A key design practice is to treat the PECL input and CMOS output as separate high-speed signal paths. Use short, impedance-controlled connections, minimize parasitic capacitance, provide the required local decoupling, and validate source and load termination with an oscilloscope or suitable high-bandwidth test equipment. Do not infer differential signal integrity, jitter performance, or logic thresholds from the basic frequency and interface specifications alone.
This product record combines the verified distributor and manufacturer data with an explicit distinction between documented facts and missing parameters. It also identifies where application-specific companion parts may help engineers build a broader clocking system, while clearly noting that no pin-compatible replacement was verified by the supplied cross-reference results.
드롭인 대체품: ICS508M — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 제품에는 사용 가능한 드롭인 대체품이 없습니다.
대체품 요청ICS508M 사양
| Product Type | PECL-to-CMOS clock converter |
| Maximum Frequency | 250 MHz |
| Input Logic Level | PECL |
| Output Logic Level | CMOS |
| Number of Circuits | 1 circuit |
| Input-to-Output Ratio | 1:1 |
| PLL | No |
| Differential Input | Yes |
| Differential Output | No |
| 패키지 | 8-pin SOIC, 3.90 mm width |
| 실장 유형 | Surface mount |
| Supply Architecture | Separate VDD supplies for input and output sections |
ICS508M 8-pin soic, 3.90 mm width 핀 구성 가이드
ICS508M(8-pin soic, 3.90 mm width 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: ICS508M.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
ICS508M 적합 용도: 6 애플리케이션s: High-Speed Digital Backplane Clock Conversion, FPGA and ASIC Clock Interface, Telecommunications Timing Interface, Legacy ECL-to-CMOS Migration, High-Speed Test and Measurement Equipment, Industrial Data Acquisition Clocking.
High-Speed Digital Backplane Clock Conversion
The ICS508M is appropriate when a backplane distributes a differential PECL clock but a receiving board requires a single-ended CMOS reference. Its documented maximum frequency is 250 MHz, and the 1:1 input-to-output ratio preserves the source clock cadence without PLL multiplication or division. The converter can serve as the boundary between a traditional ECL-family backplane and modern CMOS logic. During implementation, verify the source termination, transmission-line impedance, receiver threshold, and allowable edge rate at the destination. Keep the PECL input route short and maintain continuous reference-plane geometry to limit reflections.
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FPGA and ASIC Clock Interface
The ICS508M can bridge a system in which the primary high-speed oscillator or distributor produces differential PECL but an FPGA, ASIC, or other CMOS controller accepts only a single-ended clock. Its 250 MHz maximum frequency makes it relevant for moderately high-speed digital interfaces, while the no-PLL, 1:1 architecture avoids unnecessary frequency synthesis. Before implementation, compare the FPGA clock-input threshold, minimum pulse width, jitter tolerance, and maximum input transition time with the manufacturer data. Supply decoupling must be placed close to each separate VDD pin, and the converter output should be routed without test-point stubs that could degrade edge quality.
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Telecommunications Timing Interface
The ICS508M is useful in telecommunications equipment that retains PECL clock distribution while transitioning selected logic blocks to CMOS. The PECL differential input supports common high-speed ECL-family clock distribution practices, while the CMOS output can feed digital processing sections. The 1:1 ratio is important in timing chains because it avoids intentional frequency multiplication and keeps the stage conceptually transparent. Engineers should still budget the converter's propagation delay, supply-noise coupling, and output jitter into the system timing analysis. Exact values for those parameters were not present in the supplied snippets and must be obtained from the manufacturer datasheet.
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Legacy ECL-to-CMOS Migration
The ICS508M provides a practical migration path for legacy systems in which a central clock section uses PECL but newer logic requires CMOS. Rather than redesigning the established clock-distribution network, the converter can be placed at the interface and preserve a 1:1 clock relationship through 250 MHz. The separate VDD connections allow input and output circuitry to use appropriate rail voltages. Migration work should include logic-level translation checks, termination validation, and timing-budget updates. Engineers should not assume the converter restores signal integrity upstream; excessive jitter, skew, or edge degradation in the legacy distribution network will remain a system-level concern.
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High-Speed Test and Measurement Equipment
The ICS508M can convert a differential PECL clock into CMOS for instrumentation, automated test systems, or laboratory circuits whose timing engine expects CMOS. Its single-ended output and 250 MHz capability simplify connection to general-purpose logic while retaining the source clock frequency. The design should keep the converter close to the receiving instrument, provide independent local decoupling for the input and output supplies, and measure output rise time, jitter, and edge integrity at the actual load. Because exact jitter and timing specifications were not supplied, waveform validation remains important when the clock participates in calibration, trigger, or data-acquisition accuracy.
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Industrial Data Acquisition Clocking
The ICS508M can support industrial acquisition and control equipment that derives a system reference from a PECL timing network but feeds CMOS processors or programmable logic. The 250 MHz maximum frequency accommodates high-speed digital control paths, and the 1:1 ratio avoids changing the intended sampling or processing cadence. In a ruggedized industrial design, pay particular attention to supply noise, ground-plane continuity, and the temperature range against the manufacturer's published limits. Because the supplied source did not provide the operating-temperature ratings or output-jitter figures, those parameters must be verified before using the device in safety-critical or high-accuracy acquisition systems.
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추천 제품 요약
엔지니어링 참조 데이터: ICS508M — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 |
|---|---|
| Package | 8-pin SOIC, 3.90 mm width |
| Brand | Renesas Electronics |
| Function | PECL-to-CMOS clock converter |
| Maximum Frequency | 250 MHz |
| Input Logic | Differential PECL |
| Output Logic | Single-ended CMOS |
| Input-to-Output Ratio | 1:1 |
| PLL | No |
주요 차별점
- Dedicated high-speed PECL-to-CMOS conversion (vs ICS501M)
- One-to-one clock relationship without synthesis (vs ICS502M)
- Separate input and output supply architecture (vs ICS651M)
설계 노트
Treat the PECL input and CMOS output as separate high-speed routing domains. Place the device close to the receiver when practical, maintain a continuous ground plane, avoid stubs and unnecessary test pads, and preserve controlled-impedance geometry where the board architecture uses transmission lines. Confirm the logic-family transition requirements and termination arrangement in the manufacturer datasheet rather than copying a generic PECL termination arrangement without considering trace impedance and source configuration.
Provide local, low-inductance decoupling at the separate input-side and output-side VDD connections. Because the supplied verified data does not state the permitted supply-voltage ranges or recommended capacitor values, use the manufacturer datasheet for those values and verify startup behavior at the actual clock frequency. Avoid sharing unfiltered supply paths between the clock-conversion stage and noisy switching loads, and monitor output jitter during system-level power-integrity testing.
Do not select a related ICS-series clocking device as a drop-in replacement without comparing its input interface, output interface, supply architecture, ratio, frequency limit, and complete pin assignment. The supplied cross-reference search did not verify a pin-compatible alternative for ICS508M. Likewise, do not infer propagation delay, jitter, edge rate, or operating temperature from the 250 MHz headline specification; obtain each value from the official Renesas datasheet before closing the timing and reliability analysis.
규정 준수 정보
The supplied verified snippets do not contain explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. These fields remain unknown rather than being inferred from general Renesas corporate policies.