SY73551LZG - 1:4 LVCMOS Clock Fanout Buffer 8-SOIC | Microchip
Teilenummer: SY73551LZG ✓ AktivSY73551LZG Übersicht
A clock fanout buffer is a timing-distribution IC that takes one input clock signal and regenerates multiple identical copies with minimal added skew and jitter. In the system hierarchy of clock and timing ICs, fanout buffers sit between the clock source (crystal oscillator, PLL synthesizer, or SoC clock output) and the load devices (FPGAs, ASICs, processors, transceivers), preventing the signal-integrity degradation and loading problems that occur when a single oscillator output drives many destinations directly.
Key features of the SY73551L include four LVCMOS/LVTTL-compatible outputs, single-ended input acceptance, and the low additive jitter and tight output-to-output skew required to preserve timing margins in synchronous digital systems. The 8-SOIC footprint keeps the buffer physically close to clock destinations, minimizing trace stub lengths that would otherwise amplify reflections on fast edges. Its wide 3.0V-to-3.6V supply tolerance allows direct connection to common 3.3V rails without a dedicated regulator.
Architecturally, the device amplifies and reshapes the input edge to restore full LVCMOS drive levels even when the source has attenuated through PCB routing or series termination. Per the Microchip datasheet, the industrial-grade temperature guarantee means output skew, propagation delay, and duty-cycle specifications remain valid over the entire -40°C to +85°C range, not merely at room temperature.
Typical applications include clock distribution to FPGA and DSP banks in industrial control, network interface cards distributing a reference clock to PHY and MAC devices, test and measurement instruments fanning a master clock to multiple converter stages, and telecom line cards. Any synchronous system that drives more than two clock loads from one source benefits from a dedicated fanout buffer.
When designing with this part, keep each of the four output traces length-matched and source-terminated, and decouple the 3.3V rail with a 0.1uF ceramic capacitor placed within a few millimeters of the VDD pin. Leave unused outputs properly terminated per the datasheet guidance rather than floating.
This page adds distributor context, application guidance, and drop-in alternative analysis that go beyond the raw datasheet content, helping engineers both select the SY73551LZG and qualify substitutes quickly.
Drop-in-Alternativen für SY73551LZG – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
SY73551LZG-TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SY73551LZG Technische Daten
| Funktion | 1:4 LVCMOS/LVTTL clock fanout buffer |
| Anzahl der Ausgänge | 4 |
| Input Type | Single-ended LVCMOS/LVTTL |
| Ausgangstyp | LVCMOS/LVTTL |
| Maximum Input Frequency | 160 MHz |
| Versorgungsspannung | 3.3 V ±10% (3.0 V to 3.6 V) |
| Betriebstemperaturbereich | -40°C to +85°C (industrial) |
| Gehäuse | 8-SOIC, 3.90 mm width (0.154 in) |
| Montageart | Surface Mount |
| Packaging | Tube (Z suffix); Tape & Reel (-TR suffix) |
| Product Line | Micrel Precision Edge (now Microchip Technology) |
| RoHS-Status | unknown |
SY73551LZG 8-soic, 3.90 mm width (0.154 in) Pinbelegungsleitfaden
Pinbelegung für SY73551LZG (8-soic, 3.90 mm width (0.154 in)-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für SY73551LZG.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
SY73551LZG ist geeignet für 6 Anwendungs: FPGA Clock Distribution, Network Interface Cards, Test and Measurement Instruments, Industrial Control and Automation, Telecom Line Cards, Embedded Processor Boards.
FPGA Clock Distribution
In FPGA-based systems, a single system oscillator must often drive the FPGA, an associated memory controller, and external converters. The SY73551LZG takes one LVCMOS clock input up to 160 MHz and regenerates four low-skew LVCMOS outputs from a 3.3V ±10% rail, so one oscillator serves the entire synchronous domain. Placed near the FPGA with length-matched traces, the buffer keeps output-to-output skew small enough for source-synchronous interfaces and avoids the loading-induced edge slowdown that occurs when an oscillator drives multiple destinations directly. The -40°C to +85°C industrial rating preserves skew specifications across the full deployment temperature envelope.
Empfohlen
Network Interface Cards
Ethernet and other wired networking line cards need one reference clock distributed to the PHY, the MAC, and sometimes a switch ASIC simultaneously. The SY73551LZG fans out a 25 MHz or 125 MHz reference from a single oscillator to four LVCMOS loads with low additive jitter, keeping transmit and receive timing aligned. Its 3.3V supply matches common PHY I/O rails, and the compact 8-SOIC package fits the tight board area near the magnetics and PHY typically reserved for clocking. The industrial temperature guarantee also suits industrial Ethernet hardware deployed in unconditioned cabinets.
Empfohlen
Test and Measurement Instruments
Bench instruments and modular test hardware frequently synchronize multiple ADC/DAC stages from one master clock. The SY73551LZG accepts the master clock up to 160 MHz and delivers four LVCMOS copies with tight output-to-output skew, which directly limits inter-channel timing uncertainty in sampled systems. Operating from a 3.3V rail with -40°C to +85°C guarantee, the buffer maintains its skew specification over warm-up and ambient drift inside an instrument enclosure. The 8-SOIC package allows placement close to each converter cluster, minimizing trace stubs that would otherwise reflect fast clock edges.
Empfohlen
Industrial Control and Automation
Programmable logic controllers, motor-control boards, and distributed I/O modules run multiple synchronous devices - microcontrollers, ADC front ends, communication controllers - from one clock source. The SY73551LZG distributes that clock to four LVCMOS destinations up to 160 MHz from a standard 3.3V rail, eliminating the signal-integrity risk of heavily loaded oscillator outputs. Its guaranteed -40°C to +85°C industrial range means timing parameters remain valid on factory floors and in outdoor control cabinets without derating analysis. The tube-packed 8-SOIC form also suits low-to-medium-volume board assembly common in industrial equipment production.
Empfohlen
Telecom Line Cards
Telecom and backhaul line cards distribute a system reference clock to framers, mappers, and serializers. The SY73551LZG provides a 1:4 LVCMOS fanout with low additive jitter up to 160 MHz, preserving the timing budget allocated to clock distribution in synchronous telecom designs. Running from a 3.3V ±10% supply ties directly into the card's existing 3.3V plane, and the industrial -40°C to +85°C guarantee covers central-office and outdoor-plant ambient extremes. The small 8-SOIC footprint lets designers repeat the clocking cell across multichannel cards with minimal board-area cost.
Empfohlen
Embedded Processor Boards
Single-board computers and embedded module carriers often need to clock an MCU, an external RTC subsystem, and peripheral devices from one reference. The SY73551LZG fans out a single oscillator output to four LVCMOS loads up to 160 MHz, so embedded designers avoid retiming headaches from daisy-chained clock traces. The 3.0V-to-3.6V supply tolerance rides the main 3.3V rail, and the 8-SOIC package fits within dense carrier-board clocking sections. Because the industrial temperature range is guaranteed, the same design transfers across consumer and industrial variants of the embedded platform without a component change.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SY73551LZG – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SY73551LZG-TR |
|---|---|---|
| Package | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) - same |
| Brand | Microchip Technology | Microchip Technology |
| Fanout Configuration | 1:4 | 1:4 |
| Maximum Input Frequency | 160 MHz | 160 MHz |
| Supply Voltage | 3.3 V ±10% | 3.3 V ±10% |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C |
| Output Type | LVCMOS/LVTTL | LVCMOS/LVTTL |
| Packing | Tube | Tape & Reel |
Wichtigste Unterscheidungsmerkmale
- Identical-die packing flexibility (vs. SY73551LZG-TR)
- Guaranteed industrial temperature range (vs. SY73551LZG-TR)
- Single 3.3V supply with ±10% tolerance (vs. SY73551LZG-TR)
Designhinweise
Length-match the four output traces from the SY73551LZG to their destinations. Because the buffer's value lies in low output-to-output skew, unequal trace lengths reintroduce skew that the IC removed. For mixed-frequency or mixed-length topologies, group destination loads with similar routing distances on the same buffer output, and reserve the lowest-skew critical destination for the output with the shortest achievable route.
Decouple the 3.3V supply with a 0.1uF ceramic capacitor placed within a few millimeters of the VDD pin, plus a bulk 1uF to 10uF capacitor nearby. Supply transients created when the four LVCMOS outputs switch concurrently couple directly into the buffer's output edges as jitter if the local decoupling loop is large. A solid ground return under the clock traces further reduces the coupling path.
Source-terminate each LVCMOS output with a series resistor (typically 22 to 33 ohms, adjusted to the trace impedance) placed at the buffer pin. This dampens reflections from the far-end load and keeps clock edges monotonic, which matters for converter clock inputs where edge ringing causes aperture errors. Avoid stub topologies on buffered clock nets; daisy-chain or point-to-point routing preserves the edge quality the buffer provides.
Compliance-Informationen
No explicit compliance statements appear in the available product listings; verify RoHS/REACH status on the official Microchip product page before release. No AEC-Q100 variant of the SY73551L family is documented.
