MK2049-34SAI - 77.76MHz 3.3V VCXO PLL | Renesas
MPN： MK2049-34SAI ✓ 啟用中MK2049-34SAI 概覽
A VCXO PLL clock synthesizer is a timing device that combines a voltage-controlled crystal oscillator with a phase-locked loop. In the broader semiconductor hierarchy, it belongs to clock and timing ICs, where a PLL synchronizes an adjustable output to a stable reference. This architecture allows a system to derive multiple or rational clock relationships while attenuating phase noise and reducing frequency variation.
The MK2049-34SAI operates from a 3.15 V to 3.45 V supply, making it suitable for 3.3 V communications systems. Its listed LVCMOS interfaces support integration with digital logic, while the 77.76 MHz maximum frequency provides headroom for telecom transport, networking, and embedded communications equipment. The package is a 20-SOIC measuring 0.295 inches, or 7.50 mm, in width.
The device is identified as a PLL clock synthesizer with one listed circuit and an input-to-output ratio of 1:3. The manufacturer datasheet also describes the MK2049-34A family as a dual phase-locked-loop device capable of frequency synthesis and jitter attenuation. These functions allow an external reference to establish the operating point while internal loop behavior controls the generated communication clock.
Typical uses include line-card clocking, telecommunications equipment, network-interface timing, and other systems requiring a stable synthesized output from a low-frequency reference. In these applications, the 3.3 V operating range aligns with conventional communications logic, while LVCMOS signaling simplifies connection to digital clock buffers, processors, converters, and field-programmable logic.
When designing the clock path, verify the reference frequency, output division or multiplication ratio, loop filtering, and external crystal requirements against the manufacturer datasheet. Keep the clock traces short and provide a clean return path, particularly when the generated signal drives high-speed digital circuitry. Decoupling and output loading also affect clock quality, so validate them against the intended operating conditions.
This product page consolidates the verified electrical characteristics, package details, application guidance, sourcing paths, and engineering trade-offs for the MK2049-34SAI. It also explains where additional design data must be taken directly from the manufacturer datasheet, including the complete pin description and application-specific reference circuitry.
直接替換替代品，適用於 MK2049-34SAI — 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。
此產品無可直接替換的替代品。
申請替代品MK2049-34SAI 規格
| Device Type | VCXO PLL clock synthesizer |
| Supply Voltage Range | 3.15 V to 3.45 V |
| Nominal Supply Voltage | 3.3 V |
| Maximum Output Frequency | 77.76 MHz |
| Reference Clock Frequency | 8 kHz |
| Input Logic Level | LVCMOS |
| Output Logic Level | LVCMOS |
| Input-to-Output Ratio | 1:3 |
| Number of Circuits | 1 |
| PLL Configuration | Yes |
| Differential Input/Output | No/No |
| 封裝 | 20-SOIC |
| Package Width | 7.50 mm (0.295 inch) |
| 安裝類型 | Surface mount |
MK2049-34SAI 7.50 mm (0.295 inch) 腳位配置指南
MK2049-34SAI（7.50 mm (0.295 inch) 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： MK2049-34SAI.
請參閱 資料表 以查看完整腳位配置。
典型應用
MK2049-34SAI 適用於 6 應用s: Telecommunications Line-Card Clocking, Network Interface Timing, Synchronous Digital Backplane, Audio and Communications Codec Timing, Industrial Embedded Communications, Clock Regeneration for Communication Processors.
Telecommunications Line-Card Clocking
The MK2049-34SAI fits telecommunications line-card clocking because it is a 3.3 V communications VCXO PLL with LVCMOS input and output, a maximum frequency of 77.76 MHz, and frequency-synthesis and jitter-attenuation functions. It can be placed in the clock-control path to derive a stable communications clock from a low-frequency reference such as the datasheet's 8 kHz example. The 20-SOIC package supports conventional surface-mount assembly, while its 3.15 V to 3.45 V operating range aligns with 3.3 V communications electronics.
推薦
Network Interface Timing
The MK2049-34SAI can support network-interface timing where a stable, synthesized LVCMOS clock is needed alongside high-speed digital logic. Its PLL-based architecture provides frequency synthesis and jitter attenuation, while the 77.76 MHz maximum output accommodates common communications clock domains. The device is most useful when the board must derive a controlled output from an external reference rather than relying only on a free-running oscillator.
推薦
Synchronous Digital Backplane
For synchronous backplane and communications control systems, the MK2049-34SAI provides a phase-locked output derived from a stable reference. The 3.3 V supply operation and LVCMOS interfaces simplify integration with clock buffers, processors, and programmable logic, while the maximum 77.76 MHz output supports high-speed transfer-rate clocking. Design effort should focus on output ratio selection, reference stability, jitter limits, and controlled-impedance routing rather than basic voltage compatibility alone.
推薦
Audio and Communications Codec Timing
The MK2049-34SAI can provide a controlled communications or mixed-signal system clock to codec-based products. Although it is a communications clock synthesizer rather than an audio-specific jitter-cleaning device, its PLL-based frequency synthesis and jitter attenuation functions can create a stable reference-derived output. The LVCMOS interface and 3.3 V supply are useful for designs where an audio codec, communications controller, and digital interface must operate from a coordinated clock architecture.
推薦
Industrial Embedded Communications
The MK2049-34SAI is applicable to embedded industrial communications equipment that requires a stable synthesized clock from a common reference. Its 3.15 V to 3.45 V operating range fits 3.3 V embedded platforms, while the 20-SOIC package avoids requiring a specialized fine-pitch package. System designers should confirm that the output ratio, reference implementation, and jitter performance meet the timing margin of the attached processor or communications controller.
推薦
Clock Regeneration for Communication Processors
The MK2049-34SAI can sit ahead of clock buffers or communication processors when the design needs to regenerate or synthesize a timing signal from a stable reference. Its listed 1:3 input-to-output ratio provides a defined conversion mode, and the 77.76 MHz maximum output covers established communications rates. Before implementation, verify the exact mode supported by the selected ordering code and account for reference jitter, loop filtering, load capacitance, and clock-edge requirements.
推薦
推薦產品摘要
工程參考資料，適用於 MK2049-34SAI — 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 |
|---|---|
| Brand | Renesas Electronics |
| Package | 20-SOIC |
| Device Type | VCXO PLL clock synthesizer |
| Supply Voltage Range | 3.15 V to 3.45 V |
| Maximum Output Frequency | 77.76 MHz |
| Reference Clock Example | 8 kHz |
| Input Interface | LVCMOS |
| Output Interface | LVCMOS |
| Input-to-Output Ratio | 1:3 |
| Differential I/O | No/No |
主要差異化特點
- Purpose-built 3.3 V communications clock function (對比MK2049-34SAI)
- Reference-to-output synthesis capability (對比MK2049-34SAI)
- 77.76 MHz maximum output in a surface-mount package (對比MK2049-34SAI)
設計說明
Route the reference input and clock outputs as short traces on a continuous ground plane, with their return current following directly beneath each signal. Keep test pads and breakout stubs away from sensitive clock nodes, especially when operating near the listed 77.76 MHz upper limit. Confirm that output loading and board parasitics do not distort edge rates or introduce timing margin loss at the clock receiver.
Design the 3.3 V supply path so it remains between 3.15 V and 3.45 V under worst-case load and temperature. Place the required bypass capacitors adjacent to the supply and ground pins and minimize the impedance between each capacitor and the device. A low-impedance supply plane helps prevent reference noise from coupling into the PLL output and disturbing the synthesized clock.
Do not select a replacement solely because it is also a 20-SOIC PLL. Verify pin-to-pin assignments, input and output logic levels, supply limits, supported frequency ratios, reference requirements, and jitter. The MK2049-34SAI is specified for 3.3 V LVCMOS operation with a maximum output frequency of 77.76 MHz; a part with a wider supply range or different pin function can still require PCB changes or clock-tree redesign.
Treat the generated clock as a controlled-impedance signal even when it uses LVCMOS. Use the manufacturer's recommended output loading and termination approach, avoid long stubs, and measure edge quality at the final receiver when the design has a high fanout or extended trace. Validate jitter at the system level because a compliant frequency alone does not guarantee adequate timing margin.
合規資訊
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration is identified in the available product information.
