SY87701LHI - 1.25Gbps AnyRate CDR | Microchip Technology
Teilenummer: SY87701LHI ✓ AktivSY87701LHI Übersicht
A clock and data recovery IC is a timing subsystem that extracts a usable serial clock from an incoming data stream and aligns recovered data with that clock. Within the broader semiconductor hierarchy, the SY87701LHI is an integrated circuit, a clock and timing device, and a CDR. Its AnyRate architecture supports multiple line rates through one clock-recovery solution, reducing the need for separate recovery devices in multi-rate systems.
Key verified characteristics include a 3.3 V power supply, an operating data-rate range of 32 Mbps to 1.25 Gbps, NRZ data recovery, and clock generation from a 1.25 Gbps stream. The device also provides an industrial-temperature option, according to the retrieved product documentation. The manufacturer documentation states that the PLL complies with the proposed jitter specifications for SONET/SDH equipment in Bellcore Specifications GR-253-CORE, Issue 2, December 1995 and ITU-T Recommendation G.958 when used with differential inputs and outputs.
The device is intended for telecommunications equipment operating at OC-3, OC-12, and related serial-data rates. Its differential interface architecture and integrated clock-recovery function make it relevant to line cards, optical interface modules, SONET/SDH terminal equipment, ATM equipment, and other designs requiring synchronized NRZ data transfer. The exposed-pad TQFP construction also requires attention to thermal dissipation and PCB thermal design.
A key design consideration is that the SY87701LHI is a high-speed timing device rather than a general-purpose logic IC. Differential routing, controlled impedance, solid reference planes, short return paths, and careful decoupling are essential for predictable signal integrity. The application circuit and pin assignments should be taken directly from the manufacturer datasheet, including the exposed-pad connection and differential input or output requirements.
This product page consolidates the verified 3.3 V supply, 32 Mbps to 1.25 Gbps AnyRate operation, package information, timing-standard references, sourcing links, and practical integration guidance. Pin-level details not exposed in the supplied search evidence are intentionally left unspecified rather than inferred, allowing engineers to download the manufacturer PDF before layout or schematic release.
Drop-in-Alternativen für SY87701LHI – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Für dieses Produkt sind keine Drop-in-Alternativen verfügbar.
Alternativen anfordernSY87701LHI Technische Daten
| Product Type | AnyRate clock and data recovery IC |
| Versorgungsspannung | 3.3 V |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 1.25 Gbps |
| Clock Generation Rate | Up to 1.25 Gbps |
| Data Format | NRZ |
| Temperature Grade | Industrial temperature range |
| Gehäuse | 32-pin TQFP with exposed pad |
| Pin-Anzahl | 32 pins |
| Montageart | Surface mount |
| Application Standard | Bellcore GR-253-CORE, Issue 2, December 1995 |
| Application Standard | ITU-T Recommendation G.958 |
| Interface Condition | Differential inputs and outputs |
| Target Protocol | SONET/SDH |
| Target Protocol | ATM |
SY87701LHI 32-pin tqfp with exposed pad Pinbelegungsleitfaden
Pinbelegung für SY87701LHI (32-pin tqfp with exposed pad-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für SY87701LHI.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
SY87701LHI ist geeignet für 6 Anwendungs: SONET/SDH Line Cards, ATM Network Interfaces, OC-3 Optical Interfaces, OC-12 Backplane Links, Optical Module Timing, High-Speed Serial Test Equipment.
SONET/SDH Line Cards
The SY87701LHI fits SONET/SDH line-card timing because it recovers clock and data from NRZ streams spanning 32 Mbps to 1.25 Gbps. According to the manufacturer datasheet, its PLL complies with the cited Bellcore GR-253-CORE and ITU-T G.958 jitter proposals when used with differential inputs and outputs. A designer can place the CDR near the high-speed serial interface, use controlled-impedance routing, and minimize trace length to preserve signal integrity. Differential interfaces and a 3.3 V supply align with telecommunications equipment, while the AnyRate range can support multiple line rates without relying on separate recovery ICs.
ATM Network Interfaces
The SY87701LHI is suitable for ATM equipment requiring clock recovery from high-speed NRZ traffic. Its verified operating range of 32 Mbps to 1.25 Gbps covers the device's stated use in ATM applications, while clock generation supports systems that need to derive a timing reference from received data. The CDR should be placed near the serializer or transceiver interface, with short differential traces and a continuous ground reference to control impedance. Engineers must verify line rate, reference-clock requirements, and system jitter against the complete manufacturer datasheet before selecting it.
OC-3 Optical Interfaces
The SY87701LHI can support clock and data recovery in OC-3 telecommunications interfaces because the verified data-rate capability reaches 1.25 Gbps and the manufacturer identifies OC-3 among the target applications. It is used to align received NRZ data with a recovered serial clock before downstream processing. Placement near the line-card transceiver helps keep the high-speed differential path short, while solid reference planes and minimized stubs improve signal integrity. System designers should still check jitter transfer, latency, lock behavior, and all electrical limits in the manufacturer PDF.
OC-12 Backplane Links
The SY87701LHI is relevant to OC-12 links because its verified AnyRate range extends to 1.25 Gbps and clock generation from data is specified at the same maximum rate. The integrated CDR can recover timing from an NRZ serial stream, simplifying systems that otherwise need separate clock-recovery circuitry. At this rate, layout quality is critical: use differential impedance-controlled routing, avoid unnecessary layer transitions, provide close supply decoupling, and keep the return path continuous. The complete link must be validated for jitter and error performance rather than relying on recovered-clock functionality alone.
Optical Module Timing
The SY87701LHI can serve as the timing-recovery element in communications modules that receive NRZ data at rates within the verified 32 Mbps to 1.25 Gbps range. Recovering the clock directly from the data stream is useful when the remote transmitter does not provide a separate usable clock. In an optical-module board, the CDR should be positioned to minimize the distance to the electrical receive interface, and its differential pins should be routed over a continuous reference plane. Thermal management and exposed-pad assembly must follow the manufacturer package guidance for reliable operation.
High-Speed Serial Test Equipment
The SY87701LHI is applicable to test and measurement equipment that must establish timing from a serial NRZ source. Its verified ability to recover clock and data from 32 Mbps to 1.25 Gbps supports the development of multi-rate serial interfaces, clock-recovery test paths, and telecommunications stimulus or analysis modules. The CDR's clock-generation capability can also support source-side architectures. In such equipment, controlled impedance and short analog and digital return paths help minimize deterministic jitter, while thorough validation is needed to characterize jitter transfer and recovery performance across rate, temperature, and supply conditions.
Technische Referenzdaten für SY87701LHI – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt |
|---|---|
| Package | 32-pin TQFP with exposed pad |
| Brand | Microchip Technology |
| Device Type | AnyRate clock and data recovery IC |
| Supply Voltage | 3.3 V |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 1.25 Gbps |
| Clock Generation Rate | Up to 1.25 Gbps |
| Data Format | NRZ |
Wichtigste Unterscheidungsmerkmale
- Broad verified AnyRate operating range (vs. Generic fixed-rate CDR devices)
- Integrated clock generation (vs. CDR devices limited to clock recovery)
- Documented telecommunications timing applicability (vs. Generic NRZ interface devices)
Designhinweise
Route the differential clock and data interfaces as controlled-impedance pairs over a continuous reference plane. At the verified maximum rate of 1.25 Gbps, minimize stubs, layer changes, and unnecessary trace length, and keep the CDR close to the interface it serves. Maintain symmetrical geometry for differential pairs and provide a nearby continuous return path. The manufacturer notes that differential inputs and outputs are required for the cited SONET/SDH jitter performance, so the complete interface must be reviewed against the application circuit.
Treat the exposed pad as both an electrical connection and a thermal path. Follow the manufacturer datasheet for its ground or supply connection, use the recommended land pattern, and provide adequate solder area without violating assembly requirements. Spread heat into the PCB with vias and copper where permitted by the layout. Do not estimate thermal performance from package power alone; use the manufacturer junction and ambient limits, and verify assembly temperature in the final enclosure and worst-case operating environment.
Place input, output, and supply decoupling structures close to their associated pins, while keeping switching or unrelated high-current paths away from sensitive timing nets. Keep the clock-recovery loop compact and preserve uninterrupted ground beneath the device and differential routes. Check the application schematic for required reference components and use only the values and topology specified by Microchip. Any component substitution in the timing loop should be reviewed for parasitic inductance, capacitance, and tolerance because these can affect jitter and lock behavior.
Compliance-Informationen
The verified excerpts did not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable because this is a clock and data recovery timing IC rather than an automotive-qualified device. The manufacturer datasheet cites Bellcore GR-253-CORE and ITU-T G.958 for specified SONET/SDH PLL operation.
