SY87700VHH - 175Mbps AnyRate CDR | Microchip Technology
Référence : SY87700VHH ✓ ActifSY87700VHH Présentation
A clock and data recovery IC, or CDR, is a timing-recovery integrated circuit that reconstructs a synchronized clock from an incoming serial data stream. It belongs to the clock and timing IC hierarchy, where phase-locked-loop and voltage-controlled-oscillator techniques support high-speed data recovery. In a communications receiver, the recovered clock establishes the timing reference needed to sample incoming data reliably.
The SY87700VHH supports data rates across the 32 Mbps to 175 Mbps range, making it suitable for legacy packet transport and telecom interfaces operating within that span. Its 3.3 V and 5 V supply options provide flexibility across different receiver architectures. The single recovered-clock output simplifies designs requiring one timing channel, while the exposed-pad TQFP package supports surface-mount assembly and board-level thermal management.
Internally, the recovery loop compares the phase relationship between data-edge transitions and generated-clock transitions. A phase-and-frequency detector produces correction pulses, an integral loop filter smooths those pulses, and a voltage-controlled oscillator generates the adjusted clock. This closed-loop arrangement allows the output clock to track the timing of the incoming serial data rather than operating as an independent free-running source.
Typical applications include Ethernet line-card receivers, SONET/SDH interface equipment, ATM networking systems, optical-network terminals, and other telecommunications products using serial links in the supported data-rate range. System designers should also account for the selected reference clock, loop-filter components, supply decoupling, and the exposed thermal pad when developing a production board.
For layout, place input, reference-clock, and supply bypass connections close to their associated pins, while preserving controlled return paths for high-speed inputs. Treat the exposed pad as a thermal and electrical structure rather than an unused lead. Verify the timing budget, jitter performance, acquisition behavior, and loop-filter values against the manufacturer datasheet before fixing system clock tolerances.
This page consolidates the identified operating range, package information, application roles, sourcing guidance, and design considerations into an engineering-oriented overview. It also distinguishes direct same-family options from unsupported cross-package substitutions so engineers can assess replacement choices without changing the board footprint.
Alternatives de remplacement direct pour SY87700VHH — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec SY87700VHH (même facteur de forme et même empreinte) — différant par Package, Primary Applications, Product Type.
SY87700ALHG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SY87700LHG
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →SY87700LHI
✅ Remplacement directContactez-nous pour le prix
SY87700VHH Spécifications
| Product Type | Clock and Data Recovery IC (CDR) |
| Recovery Architecture | AnyRate clock and data recovery |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 175 Mbps |
| Recovered Clock Outputs | 1 output |
| Supply Voltage Options | 3.3 V or 5 V |
| Fréquence d'horloge maximale | 1.25 GHz |
| Boîtier | 32-pin TQFP with exposed pad, 7 mm x 7 mm |
| Type de montage | Surface mount |
| Primary Applications | Ethernet, SONET/SDH, and ATM communications |
| Timing Detection | Data-edge and generated-clock phase comparison |
| Phase Detector Output | Directional phase-correction pulses |
| Loop Filter | Integral loop filter |
| Clock Generator | Voltage-controlled oscillator (VCO) |
Guide de configuration des broches du SY87700VHH 32-pin tqfp with exposed pad, 7 mm x 7 mm
Configuration des broches du SY87700VHH (boîtier 32-pin tqfp with exposed pad, 7 mm x 7 mm). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SY87700VHH.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SY87700VHH convient pour 6 applications: Ethernet Receiver Interfaces, SONET and SDH Line Equipment, ATM Network Interfaces, Optical Network Terminals, Telecommunications Line Cards, Packet Transport and Backplane Interfaces.
Ethernet Receiver Interfaces
The SY87700VHH fits Ethernet receiver timing paths that require clock recovery from serial data between 32 Mbps and 175 Mbps. Its AnyRate CDR architecture compares data-edge timing with the generated clock, then uses a phase-and-frequency detector, integral loop filter, and voltage-controlled oscillator to produce one recovered-clock output. The 3.3 V or 5 V supply options accommodate different transceiver and line-card power architectures. Before implementation, verify the exact Ethernet line rate, reference-clock source, recovered-clock frequency, jitter tolerance, and acquisition requirements against the manufacturer timing tables.
SONET and SDH Line Equipment
The SY87700VHH is identified for SONET and SDH communications equipment, where recovered timing is essential to serial interface operation. Its recovery loop tracks phase differences between incoming data transitions and the internally generated clock, providing one clock output for downstream circuitry. The supported 32 Mbps to 175 Mbps range covers the stated operating class, while the 32-pin TQFP exposed-pad package supports compact surface-mount line cards. System qualification should confirm line-rate coverage, jitter performance, reference-clock frequency, loop-filter values, and supply sequencing for the specific optical or electrical transport path.
ATM Network Interfaces
The SY87700VHH can support timing recovery in ATM communication interfaces operating within its 32 Mbps to 175 Mbps data-rate range. A recovered clock helps the receiver establish a stable sampling reference for serialized data, while the phase-and-frequency detection loop corrects timing drift. The device's single recovered-clock output keeps the interface architecture straightforward, and its 3.3 V or 5 V operation provides supply-design flexibility. Confirm the selected ATM line rate, clock-source configuration, jitter tolerance, startup behavior, and all 32 package connections before using the circuit in production equipment.
Optical Network Terminals
The SY87700VHH is suitable for timing-recovery sections of optical network terminals that receive serial data at a rate accepted by the AnyRate CDR. Its phase detector identifies the correction direction needed to align the generated clock with incoming data transitions, and the voltage-controlled oscillator supplies the adjustable recovered-clock signal. The 7 mm × 7 mm TQFP exposed-pad package is practical for multilayer communication boards. Designers should budget optical-module latency, verify reference-clock stability, and review loop-filter and jitter requirements to ensure the recovered clock meets the end-system timing specification.
Telecommunications Line Cards
A telecommunications line card can use the SY87700VHH when an incoming serial channel requires a recovered clock and operates from 32 Mbps to 175 Mbps. The device supports both 3.3 V and 5 V supply environments and offers one recovered-clock output for a downstream serializer, framing circuit, or test path. Its closed-loop recovery architecture compares data transitions with generated-clock transitions and adjusts the VCO accordingly. Because line cards can contain multiple high-speed domains, validate return paths, isolation between channels, reference-clock distribution, and exposed-pad thermal performance before production release.
Packet Transport and Backplane Interfaces
The SY87700VHH can provide clock recovery in a packet-transport or backplane interface whose serial rate lies between 32 Mbps and 175 Mbps. Its AnyRate approach makes it useful where one timing-recovery device must accommodate multiple link rates, provided the associated reference clock and loop settings support each operating condition. The single recovered output simplifies channel organization, while the exposed-pad package helps manage heat in dense line-card layouts. Verify jitter tolerance, loss-of-signal behavior, input slew requirements, and crosstalk margin in the complete channel so the recovered timing remains usable across operating conditions.
Données de référence d'ingénierie pour SY87700VHH — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SY87700ALHG | SY87700LHG | SY87700LHI |
|---|---|---|---|---|
| Package | 32-pin TQFP with exposed pad, 7 mm x 7 mm | 32-pin TQFP with exposed pad | 32-pin TQFP with exposed pad | 32-pin TQFP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Device Type | AnyRate clock and data recovery IC | SY87700-family clock and data recovery IC | SY87700-family clock and data recovery IC | SY87700-family clock and data recovery IC |
| Target Applications | Ethernet, SONET/SDH, and ATM | SONET/SDH/ATM clock and data recovery | Clock and data recovery | SONET/SDH/ATM clock and data recovery |
Principaux différenciateurs
- Broad identified AnyRate operating interval (vs SY87700ALHG)
- Flexible supply architecture (vs SY87700LHG)
- Single-output recovered-clock architecture (vs SY87700LHI)
Notes de conception
Use the manufacturer package drawing and recommended land pattern for the 32-pin TQFP exposed-pad footprint. Place the exposed-pad thermal structure on uninterrupted copper where the recommended layout permits it, and follow the specified paste pattern to avoid voiding beneath the pad. Decoupling capacitors and clock connections should be placed close to their associated pins to minimize loop area and high-frequency parasitic inductance.
Keep the incoming data and reference-clock routing short and continuous, with a quiet return path beneath or adjacent to the relevant traces. Avoid switching-regulator nodes, high-current inductor connections, and unrelated digital timing edges near the clock-recovery inputs. When calculating timing margin, include connector loss, trace loss, input loading, and the reference-clock jitter rather than relying only on nominal frequency.
Do not treat every SY87700-family suffix as automatically interchangeable. The replacement candidates have the same general 32-pin TQFP format, but the available comparison notes differences in some electrical characteristics. Before substitution, compare data-rate limits, supply voltage, reference-clock frequency, loop-filter component values, control pins, exposed-pad connection, absolute maximum ratings, and every numbered pin in both datasheets.
The exposed pad provides a thermal path from the device to the PCB, but its effectiveness depends on copper area, layer count, via arrangement, and the enclosure's heat-transfer conditions. Validate junction temperature under the highest expected operating frequency and ambient condition. A small pad area or restricted via pattern can cause performance drift or thermal shutdown even when the logic load appears moderate.
Informations de conformité
The manufacturer document and product listings identify the device and its RoHS-related listing category, but they do not provide explicit compliance conclusions. Compliance fields therefore remain unknown.
