MK2772-01S - VCXO and Set-Top Clock Source | Renesas
Артикул: MK2772-01S ✗ Снят с производстваMK2772-01S Обзор
A VCXO, or voltage-controlled crystal oscillator, is a crystal oscillator whose frequency can be adjusted by an external voltage. The MK2772-01S combines this oscillator with an analog phase-locked loop and clock synthesis functions in one clock-and-timing IC. This integration supports set-top box designs that require a stable reference frequency plus one or more derived system clocks without implementing a complete discrete oscillator and PLL subsystem.
The principal features include a 13.5 MHz crystal input, a 0 V to 3 V VCXO tuning-control range, approximately plus or minus 100 ppm frequency adjustment, CMOS output technology, and operation from a 4.75 V supply as reported in the verified product data. The integrated PLL includes bypass capability, providing a practical path for system bring-up, test, or clock-source fallback. The 20-SOIC package supports conventional surface-mount PCB assembly.
Technically, the device uses MicroClock VCXO and analog PLL techniques to derive clocks from an economical crystal. The tuning voltage provides coarse frequency control where the target equipment needs calibration across cable, tuner, or network synchronization requirements. Because the device is identified as obsolete in verified component listings, engineers should avoid new designs and evaluate current-generation clock generators when creating a new board.
Typical uses include legacy set-top box main boards, digital video broadcast receivers, and embedded video equipment requiring a stable 13.5 MHz reference with synthesized CMOS clocks. The component may also appear in industrial or communications equipment designed around the same legacy clock architecture, provided its electrical limits, timing margins, and operating-temperature requirements are verified.
Design engineers must confirm the complete pinout, crystal load requirement, output enable behavior, control-voltage polarity, and output-drive configuration against the Renesas datasheet before layout or replacement work. Because the component is obsolete, a mechanically similar clock IC is not automatically a safe replacement: its pinout, supply voltage, PLL architecture, tuning range, and output standards must match.
This page consolidates the verified manufacturer and distributor information, lifecycle warning, pricing evidence, candidate replacements, comparison parameters, and practical design cautions for engineers evaluating the MK2772-01S or a legacy-board repair.
Аналоги без доработки для MK2772-01S — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
8725AM-21LFT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
8725AM-21LF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MK2772-01S Характеристики
| Product Type | VCXO and set-top clock source |
| Clock Generator Type | Clock synthesizer, VCXO |
| PLL | Yes, with bypass |
| Number of Circuits | 1 circuit |
| Crystal Input Frequency | 13.5 MHz |
| VCXO Control Voltage | 0 V to 3 V |
| Frequency Adjustment Range | Plus or minus 100 ppm |
| Maximum Output Frequency | 27 MHz |
| Тип выхода | CMOS |
| Input Type | Crystal |
| Рабочее напряжение питания | 4.75 V minimum |
| Диапазон рабочих температур | 0 C to 70 C |
| Корпус | 20-SOIC |
| Тип монтажа | Surface-mount SMD |
| Lead-Free Status | Pb-free |
Руководство по цоколевке MK2772-01S в корпусе 20-soic
Цоколевка для MK2772-01S (корпус 20-soic). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для MK2772-01S.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
MK2772-01S подходит для 6 применениеs: Legacy Set-Top Box Clocking, Digital Video Broadcast Receiver, Cable and Tuner Synchronization, Video Processing Equipment, Industrial Video Control Systems, Legacy Communication Equipment Repair.
Legacy Set-Top Box Clocking
The MK2772-01S is specifically identified as a VCXO and set-top clock source, making it suitable for maintenance of legacy set-top main boards that use a 13.5 MHz crystal reference. Its 0 V to 3 V tuning input can vary the generated clock by approximately plus or minus 100 ppm, allowing board-level adjustment when the tuner, demodulator, or downstream synchronization requires calibration. The integrated analog PLL and bypass mode simplify clock architecture, although the obsolete lifecycle status requires careful sourcing and full pinout verification before reuse.
Рекомендуется
Digital Video Broadcast Receiver
A digital video broadcast receiver can use the MK2772-01S as the system timing reference when its original design uses a 13.5 MHz crystal and a voltage-tuned clocking scheme. The component supplies CMOS clocks with a verified maximum frequency of 27 MHz and offers PLL bypass for diagnostic or fallback operation. Because set-top designs are highly integrated, engineers must preserve the original crystal load, tuning polarity, output-routing assignments, and supply sequencing rather than assuming that any 20-SOIC clock generator is interchangeable.
Рекомендуется
Cable and Tuner Synchronization
The MK2772-01S can support synchronization in legacy cable receiver and tuner systems that require a voltage-adjustable clock reference. Its documented 0 V to 3 V VCXO control range provides approximately plus or minus 100 ppm frequency variation, which is useful when correcting small reference offsets without replacing the crystal. The design must compensate the tuning voltage in hardware and preserve the device's specified PLL behavior; modern systems may require tighter tuning accuracy or lower jitter than this legacy oscillator provides.
Рекомендуется
Video Processing Equipment
The MK2772-01S can be used in legacy video-processing electronics where multiple CMOS clocks must be derived from one 13.5 MHz crystal. Its clock-synthesizer architecture reduces the component count associated with separate oscillator and divider networks, while PLL bypass provides a route for board test or clock fallback. Integration still requires checking CMOS load capacitance, output-enable states, frequency-plan margins, and the exact pin assignments against the manufacturer datasheet, particularly because complete pin details were absent from the supplied excerpts.
Рекомендуется
Industrial Video Control Systems
A legacy industrial video controller can use the MK2772-01S when it requires an adjustable reference clock rather than a fixed crystal oscillator. The verified operating-temperature range of 0 C to 70 C is suitable for many indoor commercial systems but not extended industrial environments. Its 4.75 V minimum supply requirement and up-to-27 MHz CMOS output also make the original schematic, regulator headroom, and downstream devices essential parts of the qualification review before substitution.
Рекомендуется
Legacy Communication Equipment Repair
The MK2772-01S is applicable to targeted repair of communication equipment that originally used its 13.5 MHz crystal, VCXO tuning input, and PLL-based clock outputs. Repair teams can use the documented plus or minus 100 ppm adjustment range and PLL bypass capability to isolate oscillator and synthesizer behavior during troubleshooting. Replacement approval should remain conditional because only two same-package candidates were surfaced, and neither excerpt demonstrates a complete pin-to-pin match to the original VCXO function.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для MK2772-01S — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | 8725AM-21LFT | 8725AM-21LF |
|---|---|---|---|
| Brand | Renesas Electronics | Microchip Technology | Microchip Technology |
| Package | 20-SOIC | 20-SOIC | 20-SOIC |
| Primary Function | VCXO and set-top clock source | Zero-delay HSTL clock generator | Zero-delay HSTL clock generator |
| Output Type | CMOS | HSTL | HSTL |
Ключевые отличия
- Native VCXO tuning for legacy set-top clocking (против 8725AM-21LFT)
- Integrated PLL bypass in the target architecture (против 8725AM-21LF)
- Purpose-built 13.5 MHz set-top reference architecture (против 8725AM-21LFT)
Заметки по проектированию
Do not treat a shared 20-SOIC package as proof of drop-in compatibility. The verified excerpts describe the MK2772-01S as a VCXO and set-top clock source with a 13.5 MHz crystal input and 0 V to 3 V tuning control, while the 8725AM-21LFT and 8725AM-21LF are described as zero-delay HSTL clock generators. Before substituting either candidate, compare every power pin, crystal connection, control input, PLL configuration, output enable, output divider, and no-connect position against the original and candidate manufacturer datasheets.
Preserve the original crystal loop placement and ground-return geometry during repair. A 13.5 MHz reference is susceptible to unwanted feedback if oscillator traces are long, adjacent to noisy switching nodes, or routed over discontinuous plane boundaries. Keep the crystal and decoupling connections compact, maintain a quiet return path, and reproduce the manufacturer's recommended component values and grounding arrangement. If the original board uses an active low-level probe near the oscillator, account for its capacitance during fault diagnosis.
Verify the original output standard and receiver thresholds before assigning CMOS outputs directly to HSTL or other legacy clock inputs. Although the supplied listing identifies the MK2772-01S output as CMOS, the replacement candidates are identified as HSTL devices. Voltage swing, crossing-point behavior, capacitive loading, termination, and downstream input thresholds can affect timing even when the package and nominal frequency match. Measure the actual clock amplitude and edges at the destination IC rather than relying only on a schematic label.
The verified operating-supply information specifies 4.75 V as the minimum supply, so do not reuse a 3.3 V-only clock architecture without confirming every pin and internal rail requirement. Maintain the original regulator's startup, bypass-capacitor, and load-transient behavior, and observe the specified 0 C to 70 C operating range. Because this part is obsolete, obtain a genuine device with traceable lot information rather than assuming any assembly with the same marking is electrically identical.
Информация о соответствии
The Renesas search excerpt describes the MK2772-01 family as Pb-free. The supplied data does not explicitly state RoHS, REACH, halogen-free, conflict-minerals, or AEC-Q100 status, so those fields remain unknown or not applicable rather than assumed.
