SY89875UMG - 2 GHz 1:2 LVDS Clock Buffer | Microchip
MPN: SY89875UMG ✓ فعالSY89875UMG نمای کلی
A clock buffer is a clock-and-timing IC that reproduces or redistributes a timing signal while preserving signal integrity, fanout capability, and controlled impedance. The SY89875UMG belongs to the clock-buffer and clock-driver hierarchy, where differential fanout devices support communication links, processor interfaces, test equipment, and other high-speed systems. Its combination of differential input flexibility and LVDS output makes it useful when a source must drive multiple destinations without introducing excessive skew or reflection.
The SY89875UMG accepts differential inputs through a termination network exposed at the VT pin. This arrangement allows the circuit to accommodate CML, HSTL, LVDS, and LVPECL source logic. A VREF-AC reference supports AC-coupled applications, while the programmable divider function adds frequency division capability. Maximum operating frequency is 2 GHz, and the 1:2 topology provides two outputs from the differential input.
The device is particularly useful when a board must fan a high-speed differential clock out to two receivers while maintaining low-voltage differential signaling. Because LVDS is a current-oriented interface, correct source termination, controlled-impedance routing, and receiver-end placement remain central to reliable signal propagation. The SY89875UMG is intended for 2.5 V systems, so its core supply and interface voltages must be checked against the connected transmitter and receiver specifications before layout release.
Typical applications include LVDS clock distribution for high-speed serial communication, source-synchronous interfaces, telecommunications equipment, industrial control systems, and data-conversion platforms. The 2 GHz operating limit supports demanding clock trees, while the programmable divider provides flexibility when the downstream system requires a divided clock rather than a direct fanout. The exposed pad also requires attention to thermal and electrical layout practices.
Place input, output, supply, and ground connections according to the manufacturer pin-description table. Keep differential traces tightly coupled, use the manufacturer-recommended termination approach, and provide low-impedance planes for return currents. Treat exposed-pad thermal performance as a function of copper area, via distribution, airflow, and adjacent heat sources rather than as a fixed device property.
This page combines device specifications, source links, application guidance, and engineering design notes to support clock-tree architecture decisions. It also distinguishes documented functions from parameters that still require confirmation, helping engineers plan sourcing and schematic review without relying on unsupported assumptions.
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درخواست جایگزینSY89875UMG مشخصات
| Device Type | Programmable clock divider and 1:2 fanout buffer |
| Maximum Frequency | 2 GHz |
| Fanout Ratio | 1:2 |
| Input Signal | Any differential input |
| Supported Input Standards | CML, HSTL, LVDS, and LVPECL |
| Output Standard | LVDS |
| Core Supply Voltage | 2.5 V nominal |
| Operating Supply Range | 2.375 V to 2.625 V |
| محدوده دمای کاری | -40°C to +85°C |
| بسته‌بندی | 16-VFQFN exposed pad (16-MLF) |
| نوع نصب | Surface mount |
| Termination Control | Internal differential termination accessible through VT pin |
| AC-Coupled Reference | VREF-AC reference output |
| Programmability | Programmable clock-divider function |
راهنمای پیکربندی پین SY89875UMG 16-vfqfn exposed pad (16-mlf)
پیکربندی پین برای SY89875UMG (پکیج 16-vfqfn exposed pad (16-mlf)). شماره‌گذاری پایه‌ها، عملکردها و نمودارهای اتصال در دیتاشیت سازنده تعریف شده است. برای footprint دقیق و دستورالعمل‌های لحیم‌کاری به آن مراجعه کنید.
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کاربردهای معمول
SY89875UMG مناسب است برای 6 کاربردs: High-Speed LVDS Clock Distribution, Telecommunications Backplane Clocking, Source-Synchronous Processor Interfaces, Industrial Data-Acquisition Systems, AC-Coupled Clock Interfaces, Test and Measurement Equipment.
High-Speed LVDS Clock Distribution
The SY89875UMG fits a 1:2 LVDS clock-distribution stage because it accepts differential CML, HSTL, LVDS, or LVPECL inputs and provides two LVDS outputs. Its documented maximum frequency of 2 GHz makes it suitable for high-speed source-synchronous and communication interfaces. Place the device near the clock source, keep the differential pair tightly coupled, and use controlled impedance to preserve edge quality. The benefit is two individually routed 2.5 V-domain clock outputs without changing the source logic standard.
پیشنهادی
Telecommunications Backplane Clocking
The SY89875UMG can support telecom backplane clock trees where one differential source must feed two destination circuits. Input-standard compatibility allows the design to work with CML, HSTL, LVDS, or LVPECL clock sources, while the output remains LVDS. Its 2 GHz maximum operating frequency covers demanding serial links, subject to receiver requirements and loss. Keep return paths continuous and maintain a constant differential impedance across board transitions and connector escapes.
پیشنهادی
Source-Synchronous Processor Interfaces
The SY89875UMG is appropriate for source-synchronous systems that require a divided or fanned-out clock delivered alongside data. Two LVDS outputs allow the clock to reach separate source and destination interface sections, while the programmable divider can create a required frequency relationship. Its 2.375 V to 2.625 V supply range suits a 2.5 V clock domain. Verify output timing relative to data and minimize branch skew between the clock and signal routes.
پیشنهادی
Industrial Data-Acquisition Systems
The SY89875UMG can distribute a differential sampling or conversion clock to two industrial acquisition channels. Standardized LVDS outputs help maintain a consistent interface across the two destinations, while input-standard flexibility simplifies adaptation to upstream FPGA, converter, or network-clock sources. The 2 GHz limit supports demanding data paths, but the complete system timing budget remains critical. Validate channel-to-channel skew and use matched input and output routing practices.
پیشنهادی
AC-Coupled Clock Interfaces
The SY89875UMG is suitable when the source clock reaches the buffer through AC-coupled capacitors. Its VREF-AC reference provides a bias point for the coupled differential network, while the accessible VT termination arrangement supports different input standards. This makes the device useful in mixed clock trees where the transmitter amplitude and common-mode level do not match the receiver directly. Select coupling and bias components from the manufacturer reference circuit rather than relying on generic LVDS values.
پیشنهادی
Test and Measurement Equipment
The SY89875UMG can provide clock fanout for test and measurement equipment that must distribute a differential reference clock to two instruments, converters, or trigger sections. The 1:2 topology reduces duplicated clock-generation circuitry, and the programmable divider allows the local rate to be adjusted for the test configuration. Its 2 GHz ceiling provides broad coverage for high-speed instrumentation. Preserve output impedance and pair geometry, and evaluate jitter contributions when the reference-clock requirement is exceptionally tight.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای SY89875UMG — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
A standard LVDS fanout buffer may be preferable when the clock already arrives as LVDS, requires no division, and the design does not need several input standards. A basic divider may be simpler when two outputs are unnecessary. The related SY89872UMG should be evaluated only through a complete pin and specification comparison because family similarity does not prove drop-in compatibility. No verified drop-in replacement was identified, so any substitution must preserve the package land pattern, pin functions, supply range, divider behavior, LVDS outputs, and timing performance.
مقایسه با جایگزین‌ها
| پارامتر | این محصول |
|---|---|
| Package | 16-VFQFN exposed pad (16-MLF) |
| Brand | Microchip Technology |
| Device Function | Programmable clock divider and 1:2 fanout buffer |
| Maximum Frequency | 2 GHz |
| Fanout Ratio | 1:2 |
| Supported Differential Inputs | CML, HSTL, LVDS, and LVPECL |
| Output Standard | LVDS |
| Core Supply Range | 2.375 V to 2.625 V |
| Operating Temperature Range | -40°C to +85°C |
| Termination Access | VT pin |
تفاوت‌های کلیدی
- Multiple differential input standards on one clock path (در مقابلGeneric single-standard LVDS clock buffer)
- Programmable division combined with 1:2 fanout (در مقابلFixed 1:2 fanout-only buffer)
- High-frequency operation with flexible termination access (در مقابلLower-frequency clock buffer)
یادداشت‌های طراحی
Route each differential pair as a tightly coupled, impedance-controlled trace over a continuous return plane. Keep the SY89875UMG output traces at matched length and geometry, avoid plane splits beneath the pair, and minimize vias because each transition can degrade edge rate and add jitter. Place the device close to the clock source to reduce sensitivity to input-trace loss and reflection.
Provide a stable 2.5 V core supply within the documented 2.375 V to 2.625 V operating range. Place local high-frequency bypass capacitance at the supply and ground pins, and verify return-current paths under output-switching conditions. Confirm decoupling values and allowable ripple against the manufacturer circuit recommendations before finalizing the power network.
Do not assume that every differential source can connect directly because the input standard and common-mode level must be compatible. Use the VT termination access and VREF-AC reference according to the datasheet reference circuits. Likewise, a device with a similar 16-pin package is not a valid substitute unless its pin functions, divider behavior, output standard, and timing specifications match.
The exposed pad is part of the package thermal path and should be connected to the ground plane using the manufacturer-recommended via pattern. Preserve uninterrupted copper beneath the device and remove unnecessary thermal relief from the pad. Validate junction temperature in the final enclosure because airflow, copper area, adjacent converters, and board construction determine the achievable temperature rise.
اطلاعات انطباق
The available product information does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because this is a clock-and-timing IC rather than an automotive-qualified component.
