MK2746-01G - 27MHz USB-DVR Clock Synthesizer | Renesas
MPN： MK2746-01G ✓ 啟用中MK2746-01G 概覽
A clock synthesizer is a clock-and-timing IC that uses a phase-locked loop (PLL) to derive stable, related output frequencies from a reference source. Within the broader hierarchy of clock and timing ICs, frequency synthesizers sit above basic clock generators and below application-specific timing systems. The MK2746-01G belongs to this clock-and-timing category because it combines a reference input, analog PLL frequency multiplication, and CMOS clock outputs intended for USB-DVR equipment.
The key feature of the MK2746-01G is its 27 MHz operating reference combined with analog PLL technology. A bypass path allows the reference clock to pass through without multiplication, which can simplify clock-tree design and support test or low-jitter operating conditions. The single-circuit implementation reduces the number of separate frequency-generation blocks required in a USB-DVR design, while the CMOS output interface connects directly to compatible downstream digital circuitry.
The MK2746-01G is specified as a low-cost, low-jitter, high-performance clock synthesizer intended specifically for USB-DVR applications. Its 2:5 input-to-output ratio provides a defined multiplication relationship for designs operating from the specified 27 MHz reference. The 16-pin TSSOP package measures 4.40 mm in body width according to the verified distributor data, making it suitable for compact consumer-electronics and set-top-box layouts where a larger clock-generator package would be inconvenient.
Typical uses include USB-DVR clock trees, USB interface timing, video timing systems, and compact consumer-electronics products that require multiple related clocks. In these systems, the crystal or external clock establishes the reference, the PLL generates the required multiplied clock, and the CMOS outputs distribute timing signals to USB and video functional blocks. The availability of PLL bypass provides an additional implementation option where preserving the reference clock may be desirable.
Designers should confirm the complete output-frequency list, exact crystal-load requirements, output-drive configuration, supply limits, and pin-level connectivity in the Renesas MK2746 datasheet before layout release. Only the 27 MHz maximum frequency, analog PLL with bypass, CMOS output type, 2:5 ratio, single-circuit count, and 16-TSSOP format were confirmed by the supplied web data. Values not explicitly present in that data are identified separately rather than inferred.
This product record combines verified manufacturer and distributor specifications, current sourcing information, a confirmed direct replacement, and practical implementation guidance. It distinguishes confirmed electrical facts from unavailable details, helping engineers evaluate the MK2746-01G for USB-DVR clock generation without relying on unverified assumptions.
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MK2746-01GLF
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查看資料表 →MK2746-01G 規格
| Product Type | Clock/Frequency Synthesizer |
| PLL Technology | Analog PLL with bypass |
| Input Type | Clock or crystal |
| 輸出類型 | CMOS |
| Maximum Frequency | 27 MHz |
| Number of Circuits | 1 circuit |
| Input-to-Output Ratio | 2:5 |
| Reference Input | 27 MHz fundamental-mode crystal or clock input |
| Primary Application | USB-DVR clock generation |
| 封裝 | 16-TSSOP, 4.40 mm body width |
| 安裝類型 | Surface mount |
| 腳位數 | 16 pins |
MK2746-01G 16-tssop, 4.40 mm body width 腳位配置指南
MK2746-01G（16-tssop, 4.40 mm body 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： MK2746-01G.
請參閱 資料表 以查看完整腳位配置。
典型應用
MK2746-01G 適用於 6 應用s: USB-DVR Clock Tree, USB Interface Timing, Video Timing Generation, Set-Top Box Clocking, Consumer DVR Platform, Crystal-Based Clock Reference.
USB-DVR Clock Tree
The MK2746-01G fits a USB-DVR clock tree because it accepts a 27 MHz fundamental-mode crystal or clock reference and uses analog PLL techniques to produce the clocks required by USB and video functions. Its confirmed 27 MHz maximum frequency, 2:5 input-to-output ratio, and CMOS outputs provide a focused clock-generation solution instead of requiring several unrelated oscillators. The PLL bypass path gives the designer an alternative clock-routing option when preserving the reference is beneficial. Layout should follow the manufacturer’s recommended crystal, decoupling, and output-routing guidance, while the complete output-frequency table must be checked against the specific USB and video clock requirements.
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USB Interface Timing
The MK2746-01G can support USB interface timing in compact set-top and DVR products because its verified function is clock generation from a 27 MHz crystal or clock source using an analog PLL. The CMOS output type is suitable for distribution to compatible digital clock inputs, and the 2:5 relationship provides a defined synthesis path for compatible designs. The single synthesizer circuit keeps the clock architecture compact, while PLL bypass can assist test or reference-preserving configurations. Before implementation, engineers should confirm output availability, edge requirements, drive capability, and supply levels from the Renesas datasheet rather than assuming every USB clock arrangement is supported.
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Video Timing Generation
The MK2746-01G is suited to video timing generation because the manufacturer identifies it as a clock and frequency synthesizer for USB-DVR applications, with a 27 MHz reference and multiple output clocks for USB and video. Its low-cost, low-jitter positioning makes it relevant to compact consumer set-top-box and recorder designs where clock consolidation is beneficial. The CMOS interface supports integration with compatible digital timing blocks, and the 16-TSSOP package controls board area relative to larger clock-generator packages. The designer must still verify each video timing frequency, output ratio, allowed jitter, and clock-domain relationship against the specific graphics and video-processing architecture.
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Set-Top Box Clocking
Within a set-top box, the MK2746-01G provides a focused solution for deriving related clocks from one 27 MHz crystal or clock input. The verified 2:5 ratio, analog PLL, bypass path, and CMOS outputs align with the device’s stated USB-DVR purpose, allowing USB, video, and control sections to share a coordinated timing source. Its single-circuit implementation can simplify clock distribution compared with several discrete oscillators, while the 16-pin TSSOP package fits conventional compact consumer-electronics layouts. Supply-voltage limits and output-drive details remain to be confirmed from the manufacturer datasheet before schematic release.
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Consumer DVR Platform
The MK2746-01G targets consumer DVR platforms that need USB and video clocks derived from a common reference. Its stated low-cost, low-jitter architecture is appropriate for compact recorder electronics, while the single synthesizer circuit can reduce the component count compared with separate clock sources. The 27 MHz reference and 2:5 ratio provide the essential design anchors, and the PLL bypass option supports alternate operating arrangements. Engineers should use the Renesas datasheet to verify crystal loading, startup behavior, output availability, jitter limits, and all package connections before fixing the reference and routing scheme.
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Crystal-Based Clock Reference
The MK2746-01G can serve as the central clock-reference device in a crystal-based design that accepts either a 27 MHz fundamental-mode crystal or an external clock input. The analog PLL permits frequency synthesis from that reference, while the bypass function provides a path for using the reference without multiplication. This combination can reduce the number of separate clock sources in USB-DVR products and makes the device suitable for compact timing architectures. The most important implementation checks are crystal load capacitance, reference amplitude, startup margin, supply decoupling, and output routing; these values were not available in the supplied snippets and must be taken from the manufacturer datasheet.
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推薦產品摘要
工程參考資料，適用於 MK2746-01G — 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 | MK2746-01GLF |
|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics |
| Package | 16-TSSOP, 4.40 mm body width | 16-TSSOP - same |
| Product Type | Clock/Frequency Synthesizer | Clock/Frequency Synthesizer |
| Maximum Frequency | 27 MHz | 27 MHz |
| PLL Configuration | Analog PLL with bypass | Analog PLL with bypass |
| Input Type | Clock or crystal | Clock or crystal |
| Output Type | CMOS | CMOS |
| Input-to-Output Ratio | 2:5 | 2:5 |
| Number of Circuits | 1 circuit | 1 circuit |
| Primary Application | USB-DVR clock generation | USB-DVR clock generation |
主要差異化特點
- Purpose-built USB-DVR clock generation (對比General-purpose clock generators)
- Reference conversion with a bypass option (對比PLL-only clock synthesizers)
- Direct replacement with identical package and terminals (對比MK2746-01GLF)
設計說明
Follow the Renesas datasheet’s recommended reference-crystal or clock-input placement, and keep the oscillator loop close to the MK2746-01G with the shortest practical ground return. Because the supplied data does not provide crystal-load capacitance, drive level, or pin-specific guidance, those values must be obtained from the manufacturer documentation before selecting load capacitors or laying out the reference network.
Route each CMOS clock output over a short, continuous path to its destination and return unused outputs to a defined state in accordance with the datasheet. Preserve a solid ground plane and avoid routing the reference clock adjacent to high-current switching nodes. Although the verified source identifies CMOS outputs and a 27 MHz maximum frequency, edge rate, output-drive strength, and crosstalk limits remain unavailable and must be checked before finalizing topology or impedance.
Do not assume that the listed 2:5 ratio defines every output or operating mode. The MK2746-01G has PLL and bypass paths, so the selected output configuration must match the USB or video clock tree being designed. Review the full output-frequency table, control logic, startup sequence, and package pinout in the Renesas MK2746 datasheet rather than extrapolating behavior from the 27 MHz reference alone.
合規資訊
No explicit compliance declarations for the MK2746-01G were included in the supplied verified web data. Compliance status must be confirmed using the current Renesas product or material-declaration documentation.
