ICS722M - 28MHz 3.3V CMOS VCXO | Renesas Electronics
部品番号: ICS722M ✗ 生産終了ICS722M 概要
A voltage-controlled crystal oscillator is a frequency-control IC built around a crystal resonator and an adjustable oscillator circuit. A VCXO belongs to the broader oscillator hierarchy, which includes crystal oscillators, frequency dividers, clock generators, phase-locked loops, and timing ICs. Unlike a fixed-frequency crystal oscillator, a VCXO permits its output frequency to be adjusted within a manufacturer-specified control range, making it useful when small frequency corrections are required for clock synchronization, filtering, or signal conversion.
The supplied product information identifies the ICS722M as a low-cost, low-jitter, high-performance 3.3 V VCXO with a CMOS output. It is available in an 8-SOIC package and is listed in tube packaging by one distributor. Its single-oscillator architecture supports applications requiring one independently adjustable clock rather than a multi-output PLL or clock-generator network. The 3.3 V supply operation also allows integration with 3.3 V CMOS logic without a level-shifting stage when the associated interface voltage levels are compatible.
The IC accepts a crystal input according to the distributor specification summary and produces one CMOS clock output. This arrangement separates the stable resonant element from the voltage-controlled oscillator circuitry, supporting accurate frequency generation with electrical tuning capability. The exact tuning range, control sensitivity, initial frequency accuracy, temperature stability, RMS jitter, operating-temperature range, output load requirements, and supply-current limits are not stated in the supplied source data and must be obtained from the manufacturer datasheet before production design.
Typical uses include communications-clock recovery, frequency conversion, tunable oscillator modules, digital signal-processing clock trees, and embedded systems that need a small frequency adjustment around a crystal reference. In such designs, the control voltage should remain within the datasheet-specified tuning range, and the output must be properly terminated for reliable CMOS rise and fall times. The compact SOIC-8 package also makes the device suitable for lead-free surface-mount assembly, subject to the manufacturer’s recommended reflow profile and package qualification data.
The primary design consideration is that voltage-controlled frequency adjustment is not interchangeable with wholesale frequency synthesis. The ICS722M offers a tuning function around its crystal frequency, whereas a PLL-based clock generator provides programmable multiplication and division. Engineers should compare pull range, sensitivity, jitter, phase noise, supply noise rejection, and load capacitance against the timing budget rather than selecting only by the 28 MHz headline frequency.
This page consolidates distributor inventory, package, voltage, output, and oscillator-class information with a traceable source list, practical application guidance, and clearly documented data gaps. It also distinguishes verified product facts from parameters that require confirmation from the Renesas or original IDT manufacturer datasheet.
ドロップイン代替品: ICS722M — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ICS722M （同一形状・フットプリント） — 相違点: Package, Supply Voltage Range, Device Type, Maximum Frequency, Manufacturer.
ICS651M
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →ICS551M
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データシートを見る →ICS542M
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データシートを見る →ICS502M
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →ICS501M
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データシートを見る →ICS722M 仕様
| Oscillator Type | Voltage-controlled crystal oscillator (VCXO) |
| Manufacturer | Renesas Electronics |
| Maximum Frequency | 28 MHz |
| Nominal Frequency | 27 MHz to 28 MHz depending on source |
| Supply Voltage Range | 3.15 V to 3.45 V |
| Nominal Supply Voltage | 3.3 V |
| 出力タイプ | CMOS |
| Number of Circuits | 1 |
| PLL | No |
| Input Type | Crystal |
| Input-to-Output Ratio | 2:1 |
| パッケージ | 8-SOIC, 0.154 inch × 3.90 mm width |
| 実装タイプ | Surface mount |
| Packaging | Tube |
ICS722M 8-soic, 0.154 inch × 3.90 mm width ピン配置ガイド
ICS722M (8-soic, 0.154 inch × 3.90 mm width パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: ICS722M.
詳細は データシート をご参照ください。
主な用途
ICS722M の用途: 6 件s: Communications Clock Reference, Tunable Frequency Conversion, Digital Signal Processing Clock Tree, Industrial Measurement and Control, Telecom and Synchronization Modules, Embedded 3.3 V Clock Generation.
Communications Clock Reference
The ICS722M fits a communications clock-reference role because it combines a crystal-controlled oscillator with an adjustable voltage-control input at a documented maximum frequency of 28 MHz. Its 3.15 V to 3.45 V operating range and CMOS output align with 3.3 V digital logic, while the integrated VCXO arrangement avoids the larger footprint of a discrete oscillator module. In implementation, the control voltage must remain inside the manufacturer-specified tuning range and the output must be terminated according to the recommended load. The supplied sources identify the device as low-jitter, but they do not provide numerical jitter or phase-noise data, so those limits must be checked against the communications link’s timing budget before design approval.
おすすめ
Tunable Frequency Conversion
ICS722M is suitable for tunable frequency-conversion stages that require a stable crystal reference with a small electrical correction applied through the control-voltage input. The 28 MHz maximum listed frequency provides a defined operating class, and the 3.3 V CMOS interface simplifies connection to conversion logic operating on the same rail. Unlike a PLL-based synthesizer, however, the ICS722M does not provide programmable multiplication or division, so the designer’s required correction range must fall within the oscillator’s verified pull range. The control network should be designed with low noise and stable impedance because voltage noise can modulate the output frequency. Numerical tuning sensitivity and phase-noise specifications are not included in the supplied data and require confirmation from the manufacturer datasheet.
おすすめ
Digital Signal Processing Clock Tree
The ICS722M can serve as a tunable source in a digital signal-processing clock tree where a small frequency adjustment helps align multiple converters, processors, or sampling systems. Its single CMOS output and 8-SOIC surface-mount package provide a compact implementation, and its 3.15 V to 3.45 V supply range accommodates nominal 3.3 V logic. The designer should verify output rise and fall time, allowable capacitive loading, jitter, and cycle-to-cycle timing before fanning out this reference to multiple loads. A low-impedance clock distribution stage may be needed if the receiver capacitance or fan-out exceeds the oscillator’s recommended loading. Since the supplied source does not state jitter, RMS phase noise, or output-drive specifications, these values remain release-gating checks rather than assumed capabilities.
おすすめ
Industrial Measurement and Control
ICS722M is appropriate for industrial measurement and control systems that need a compact, adjustable 3.3 V clock source rather than a large discrete VCXO module. Its crystal input supports a stable resonant reference, and the voltage-controlled section permits fine frequency alignment during calibration or compensation of clock-distribution errors. The 8-SOIC package is compatible with standard surface-mount assembly, although production teams must follow the manufacturer’s soldering and moisture-handling recommendations. Industrial designs should also evaluate temperature stability, aging, supply-noise rejection, and control-voltage drift over the complete operating-temperature range. Those environmental limits are not stated in the supplied verified data, so the part should not be released into a harsh industrial environment until the full manufacturer specification has been reviewed and tested against the system error budget.
おすすめ
Telecom and Synchronization Modules
The ICS722M can be used in compact telecom or synchronization modules that need a 3.3 V CMOS clock with voltage-adjustable frequency. Its maximum listed frequency of 28 MHz and crystal-based architecture make it relevant to clock-recovery and synchronization blocks operating in that frequency class. The low-cost integrated package can reduce board area compared with a discrete VCXO module, while the single output simplifies routing when the clock must be buffered for multiple destinations. The design must confirm that the required pull range covers all factory calibration and environmental variations, and that jitter or phase noise remains acceptable for the synchronization loop. Because the provided sources do not disclose these timing parameters, engineers should use the manufacturer datasheet and application characterization before selecting the ICS722M over a PLL or a higher-performance discrete reference.
おすすめ
Embedded 3.3 V Clock Generation
ICS722M is useful in embedded systems that require a surface-mount clock source and a means to compensate for small frequency errors. The 3.15 V to 3.45 V supply range supports 3.3 V power domains, and the CMOS output can be connected to compatible digital clock inputs. Compared with a fixed crystal oscillator, the VCXO control input adds calibration flexibility; compared with a PLL, it offers a simpler solution when only fine tuning around the crystal frequency is required. Implementation should isolate noisy switching and supply signals from the control-voltage path, and the output should be routed away from high-edge-rate digital nets to reduce coupling. The exact output-current capability, load capacitance, startup behavior, and operating-temperature limits must be verified from the authoritative datasheet before layout and firmware calibration are finalized.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ICS722M — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ICS651M | ICS551M | ICS542M | ICS502M | ICS501M |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 8-SOIC | 8-SOIC - verify against manufacturer datasheet | 8-SOIC - verify against manufacturer datasheet | 8-SOIC - verify against manufacturer datasheet | 8-SOIC - verify against manufacturer datasheet | 8-SOIC - verify against manufacturer datasheet |
| Availability Evidence | Distributor listings report available inventory | Site MPN listed; live stock not provided | Site MPN listed; live stock not provided | Site MPN listed; live stock not provided | Site MPN listed; live stock not provided | Site MPN listed; live stock not provided |
主な差別化要因
- Integrated voltage control in a compact 8-SOIC package （vs Discrete VCXO modules)
- Direct 3.3 V CMOS integration （vs Fixed-frequency crystal oscillators)
- Single-oscillator simplicity without a PLL （vs PLL-based clock generators)
設計ノート
Do not treat the distributor description of 27 MHz and the listed maximum frequency of 28 MHz as interchangeable specifications. Confirm the exact nominal frequency, initial accuracy, and calibration method against the manufacturer datasheet before defining the crystal load or control-voltage operating point. Also verify the eight individual SOIC pin functions, because the supplied sources confirm the package but do not provide a pinout table.
Keep the crystal, crystal-load components, oscillator IC, and decoupling capacitor physically close to minimize sensitive-loop area and clock-trace noise pickup. Route the voltage-control input away from switching nodes and use a low-impedance control source to prevent unwanted frequency modulation. The output should have a short, controlled-impedance path to the first clock receiver, with additional buffering used when fan-out or load capacitance exceeds the device requirements.
Design the 3.3 V supply rail to remain inside the verified 3.15 V to 3.45 V operating range and follow the manufacturer’s recommended bypass network. Because voltage noise can translate into output phase or frequency variation through the tuning control path, provide local decoupling and avoid sharing a noisy regulator node directly with the oscillator. Confirm the actual supply-current limit and startup behavior from the datasheet before sizing the upstream regulator.
Characterize the clock output at the actual receiver, including load capacitance, board capacitance, edge rate, and jitter contribution. A CMOS output’s nominal logic level alone does not guarantee adequate signal integrity on long or poorly terminated traces. Use the shortest practical route, provide a defined return path, and buffer the clock when driving multiple domains or crossing between voltage regions.
コンプライアンス情報
The supplied verified web data does not explicitly state compliance or qualification status. No compliance conclusion was inferred from the SOIC package or distributor inventory.
