SY87701LHG - 1.25Gbps Any-Rate CDR | Microchip
Teilenummer: SY87701LHG ✓ AktivSY87701LHG Übersicht
An AnyRate clock and data recovery, or CDR, IC is a timing-integrity component that extracts or reconstructs a usable clock from a serial data stream. It belongs to the clock and timing IC hierarchy, which includes clock buffers, clock generators, phase-locked loops, jitter attenuators, multiplexers, and data-recovery circuits. CDRs are particularly important where serial transmission introduces timing uncertainty, duty-cycle distortion, or inconsistent edge relationships that would otherwise impair receiver sampling.
Key verified capabilities include operation from 32 Mbps to 1.25 Gbps, a single recovered output, a 3.3 V supply option, and use in Ethernet, SONET/SDH, and ATM equipment. A second search result describes the family as supporting both 5 V and 3.3 V supply options, while the exact SY87701LHG distributor listing identifies the offered device as the 3.3 V version. The product also supports clock generation in addition to recovery, allowing it to address transmit, receive, and network timing functions.
The SY87701LHG is intended for communication systems where a 32-pin TQFP-EP package offers a practical balance between routing access, thermal performance, and assembly complexity. The exposed pad improves heat transfer from the integrated circuit to the PCB, but designers still need to follow the manufacturer's land-pattern and thermal-via requirements. Its AnyRate architecture is useful when one component must accommodate multiple line rates rather than requiring a separate fixed-rate recovery device for each operating mode.
Typical application areas include Ethernet line-card and switching equipment, SONET/SDH transport systems, ATM network interfaces, and other serial communication platforms. These environments benefit from synchronized clocking, recovered data outputs, and clock generation from the same timing subsystem. The part may also support telecommunications backplanes and legacy data-communication equipment where NRZ serial links operate at rates through 1.25 Gbps.
Designers should confirm signal integrity, loopback behavior, input/output timing, and supply requirements against the manufacturer datasheet before production release. PCB layout should provide a continuous return path, place decoupling capacitors close to the supply pins, and connect the exposed thermal pad to an appropriately sized ground or thermal copper plane according to the recommended land pattern.
This page consolidates verified distributor specifications, sourcing information, application context, and package-specific guidance. It also distinguishes the confirmed tape-and-reel ordering code from the base device and clearly identifies the limited number of verified drop-in alternatives rather than presenting unverified substitutes as drop-in replacements.
Drop-in-Alternativen für SY87701LHG – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
SY87701LHG-TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SY87701LHG Technische Daten
| Product Type | AnyRate Clock and Data Recovery (CDR) IC |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 1.25 Gbps |
| Maximum Clock Generation Rate | 1.25 Gbps |
| Versorgungsspannung | 3.3 V |
| Recovered Output Count | 1 output |
| Data Format | NRZ |
| Protocol Applications | Ethernet, SONET/SDH, ATM |
| Gehäuse | 32-pin TQFP with exposed pad, 7 mm x 7 mm |
| Montageart | Surface mount |
| RoHS-Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
| Lead-Free Status | unknown |
SY87701LHG 32-pin tqfp with exposed pad, 7 mm x 7 mm Pinbelegungsleitfaden
Pinbelegung für SY87701LHG (32-pin tqfp with exposed pad, 7 mm x 7 mm-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für SY87701LHG.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
SY87701LHG ist geeignet für 6 Anwendungs: Ethernet Network Interfaces, SONET and SDH Transport Equipment, ATM Network Interface Cards, Telecommunications Backplane Interfaces, Legacy Serial Data Equipment, Synchronous Network Line Cards.
Ethernet Network Interfaces
The SY87701LHG suits Ethernet serial-interface circuitry that requires recovered clocking or clock generation through 1.25 Gbps. Its verified 32-to-1250 Mbps AnyRate range allows one timing device to address multiple NRZ line rates instead of requiring a separate fixed-rate CDR for each mode. The 3.3 V supply and single recovered output align with compact network-interface designs, while the 32-pin TQFP-EP package provides ample pin access for a differential data path, recovered clock, reference connections, control, and supply routing. The exposed thermal pad should be tied to the recommended copper and via structure to avoid creating return-path discontinuities beneath high-speed signals.
Empfohlen
SONET and SDH Transport Equipment
The SY87701LHG is applicable to SONET and SDH transport paths that carry NRZ serial data at rates up to 1.25 Gbps. Its clock-and-data-recovery function supports systems needing a stable timing reference for receive or transmit datapaths, and its clock-generation capability provides additional utility within line-card timing architectures. The single recovered output keeps the verified feature set focused, while the 3.3 V operation suits communications modules built around modern digital logic. In a production design, engineers should verify protocol-specific margins, reference-clock requirements, and I/O timing directly against the manufacturer datasheet because those values were not present in the supplied distributor snippets.
Empfohlen
ATM Network Interface Cards
The SY87701LHG can support ATM network-interface applications because its verified feature set covers clock and data recovery from 32 Mbps to 1.25 Gbps over NRZ data streams. ATM equipment requires dependable edge relationships between transmitted or received data and its associated clock, making CDR functionality more valuable than a basic clock buffer alone. The device's one output and AnyRate operating range are useful in legacy line-card and aggregation platforms designed around scalable serial links. Board-level implementation should preserve controlled impedance, short high-speed traces, and a continuous ground reference, with the exposed pad connected according to the official package land pattern rather than treated as an optional thermal feature.
Empfohlen
Telecommunications Backplane Interfaces
The 1.25 Gbps maximum rate and 32-to-1250 Mbps AnyRate range make the SY87701LHG relevant to telecommunications backplane interfaces carrying recovered NRZ data. Backplane designs benefit from local clock recovery because it reduces dependence on long shared clock distribution and helps establish a clean sampling relationship between data and timing. The 32-pin TQFP-EP package provides a practical routing footprint for a communications board, but differential-pair geometry, return-path continuity, and isolation from switching regulators remain central to reliable operation. Because exact input threshold, jitter, and power specifications were not included in the verified snippets, they must be obtained from the manufacturer datasheet before link-budget and timing-margin signoff.
Empfohlen
Legacy Serial Data Equipment
The SY87701LHG's broad AnyRate range supports legacy serial data equipment where link rates vary by board, channel, or operating mode. Rather than fixing the design to one narrow recovery range, engineers can use a device verified from 32 Mbps through 1.25 Gbps to recover clock and data or generate a clock. This flexibility is useful in migration and refurbishment programs for ATM, FDDI-oriented, Ethernet, and SONET/SDH-related infrastructure identified in the device descriptions. The 3.3 V part also simplifies integration with compatible modern logic, although system-level supply sequencing and input amplitude must still be checked against the detailed manufacturer electrical tables.
Empfohlen
Synchronous Network Line Cards
The SY87701LHG is appropriate for synchronous network line cards that combine transmitted data, recovered data, and generated clock in a compact 3.3 V timing subsystem. Verified support through 1.25 Gbps makes it suitable for line rates associated with established ATM and SONET/SDH infrastructure, while the AnyRate characteristic allows the same timing architecture to accommodate several supported rates. The single output simplifies board partitioning and can reduce routing congestion compared with a multi-output timing device. Designers should still budget carefully for power-supply rejection, clock jitter, and input sensitivity because those numerical electrical characteristics require direct confirmation from the manufacturer datasheet.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SY87701LHG – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SY87701LHG-TR |
|---|---|---|
| Package | 32-TQFP-EP (7x7) | 32-TQFP-EP (7x7) |
| Brand | Microchip Technology | Microchip Technology |
| Product Type | AnyRate Clock and Data Recovery IC | AnyRate Clock and Data Recovery IC |
| Minimum Data Rate | 32 Mbps | 32 Mbps |
| Maximum Data Rate | 1.25 Gbps | 1.25 Gbps |
| Supply Voltage | 3.3 V | 3.3 V |
| Output Count | 1 output | 1 output |
| Primary Applications | Ethernet, SONET/SDH, ATM | Ethernet, SONET/SDH, ATM |
| Ordering Format | Base MPN | Tape-and-reel order code |
Wichtigste Unterscheidungsmerkmale
- Wide AnyRate operating span (vs. SY87701LHG-TR)
- Recovery and clock generation in one timing device (vs. SY87701LHG-TR)
- Established communications package compatibility (vs. SY87701LHG-TR)
Designhinweise
Implement the 32-pin TQFP-EP footprint from the manufacturer land pattern and connect the exposed pad through multiple thermal vias to an uninterrupted ground reference. The exposed pad is essential to the package's intended thermal and electrical behavior. Avoid splitting the ground plane beneath the device, and keep high-speed data and clock routes away from the pad-via field so that via stubs do not disrupt return-current continuity.
Route recovered clock and high-speed NRZ data over continuous reference planes with short, symmetric paths and no abrupt reference-plane transitions. Place any decoupling capacitors close to the associated supply pins, with short ground connections and the smallest practical loop area. The verified data identifies operation through 1.25 Gbps, so signal-integrity decisions such as controlled impedance, return-path continuity, and isolation from switching nodes should be reviewed at the actual implemented line rate.
Do not treat SY87701LHG and SY87701LHG-TR as electrically different ICs. The verified comparison describes the -TR version as a complete replacement with consistent terminals, package, performance, and functional characteristics. Choose between them based on the required assembly and ordering format. Conversely, do not substitute a generic clock buffer or unrelated CDR: the verified data supports only the Microchip SY87701LHG ordering pair as a pin-compatible drop-in candidate.
Compliance-Informationen
The supplied verified web data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim has been inferred.
