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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Skyworks Solutions Inc. CY2SSTV857ZXI-27

Name: CY2SSTV857ZXI-27
Brand: Skyworks Solutions Inc.
SKU: CY2SSTV857ZXI-27
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY2SSTV857ZXI-27

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: CY2SSTV857ZXI-27.pdf

Description:: IC CLK BUF DDR 200MHZ 1CIRC

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Product details

Overview

CY2SSTV857ZXI-27 from Spectra Linear is a differential zero-delay clock buffer IC designed for DDR333/PC2700-compliant memory subsystems. It accepts one differential LVDS-compatible input (CLK/CLK#), generates ten matched differential output pairs (Y0–Y9), operates from 60 MHz to 200 MHz, delivers <75 ps cycle-to-cycle jitter and <100 ps inter-output skew, and supports industrial temperature range (–40°C to +85°C) in a 48-pin TSSOP package.

For engineers reviewing the CY2SSTV857ZXI-27 datasheet, CY2SSTV857ZXI-27 pinout, CY2SSTV857ZXI-27 application, or CY2SSTV857ZXI-27 equivalent, key selection criteria include differential output count, PLL-enabled zero-delay operation, spread-spectrum compatibility, power-down control via PD#, and JEDEC DDR specification conformance.

Technical Context

The CY2SSTV857ZXI-27 implements a PLL-based zero-delay architecture where FBIN/FBIN# connects to FBOUT/FBOUT# to eliminate propagation delay and align output edges with the input reference edge. Its internal PLL locks to differential input frequencies between 60 MHz and 200 MHz and maintains static phase offset within ±50 ps.

It features dual power domains: AVDD (2.5 V) supplies the PLL and can be strapped to GND to bypass the PLL for test mode, while VDDQ (2.5 V) powers all ten differential output buffers. Outputs enter high-impedance state when PD# is asserted low or when input clock frequency drops below 10 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency	60 MHz to 200 MHz - supports DDR266/DDR333 SDRAM timing requirements with guaranteed lock and stable output.
Output Count	10 differential output pairs (Y0–Y9) - enables single-chip clock distribution to multiple DDR SDRAM devices or DIMM slots.
Cycle-to-Cycle Jitter	< ±75 ps - ensures timing margin integrity in high-speed DDR data capture windows.
Inter-Output Skew	< 100 ps - guarantees simultaneous clock arrival across memory channels for synchronous operation.
Supply Voltage	2.5 V ±5% on both AVDD (PLL core) and VDDQ (output drivers) - mandates tight regulation and local 0.1 µF bypassing per supply pin.
Temperature Range	–40°C to +85°C - qualified for industrial-grade embedded systems and server memory modules.
Input Compatibility	LV differential input (CLK/CLK#, FBIN/FBIN#) with VID ≥ 0.36 V - interoperable with standard DDR clock sources and SSTL-2 signaling.

Pinout & Package

Package: 48-pin Thin Shrink Small Outline Package (TSSOP), 6 mm × 12 mm body, Type II, lead-free (RoHS-compliant), industrial temperature grade.

Pin/Terminal	Circuit Role	Design Meaning
CLK, CLK#	Differential clock input	Primary reference input for PLL; requires 120 Ω differential termination; LVDS-compatible.
FBIN, FBIN#	Differential feedback input	Connected to FBOUT/FBOUT# to close PLL loop and achieve zero-delay operation.
FBOUT, FBOUT#	Differential feedback output	Provides phase-aligned feedback signal; optional external capacitor adjusts phase relationship.
Y0–Y9, Y0#–Y9#	Differential clock outputs	10 matched output pairs; each pair drives one DDR SDRAM device or DIMM rank.
PD#	Active-low power-down control	Asserting low disables all outputs (Hi-Z) and powers down PLL; enables dynamic power management.
VDDQ (pins 4,11,12,15,21,28,34,38,45)	Output buffer supply	2.5 V supply for all 10 differential output drivers; requires dedicated 0.1 µF bypass capacitors.
AVDD (pin 16)	PLL core supply	2.5 V supply for PLL; grounding AVDD bypasses PLL and routes CLK directly to outputs.
VSS / AVSS	Ground terminals	Digital ground (VSS) and analog ground (AVSS) must be separated and connected at single point to minimize noise coupling.

Key Features

Feature	Design Value
Zero-delay PLL architecture	Eliminates propagation delay by locking output edges to input reference edge via FBIN/FBOUT feedback loop.
Spread-spectrum compatibility	Supports SSC modulation (30–50 kHz, –0.5% down-spread) without degrading jitter or skew performance.
Dynamic output enable/disable	PD# control allows real-time clock gating of all 10 differential outputs with ≤25 ns enable time and ≤8 ns disable time.
Low-frequency input detection	Automatically places all outputs in high-impedance state when CLK/CLK# frequency falls below 10 MHz - prevents spurious switching.
Dual-supply domain isolation	Separate AVDD (PLL) and VDDQ (outputs) rails allow independent power sequencing and fault containment.

Applications

DDR333 Memory Subsystem	Industrial Server Memory Module
Use Scenario: Distributing synchronized clock signals to eight DDR SDRAM chips across two ranks on a single DIMM. IC Role / Device Role / Timing Role: Zero-delay differential clock buffer generating ten matched outputs (Y0–Y9) to drive address/command/data strobes and chip-select clocks. Use Value: Maintains <100 ps inter-output skew and <75 ps cycle-to-cycle jitter to meet DDR333 tAC and tDQS timing budgets under industrial temperature stress.	Use Scenario: Clock distribution in a ruggedized 1U server motherboard supporting ECC DDR266/333 memory with hot-swap capability. IC Role / Device Role / Timing Role: Industrial-grade clock repeater with PD#-controlled power gating for memory power states (C3/C4). Use Value: Enables full memory subsystem shutdown during idle cycles while retaining fast wake-up (<100 µs PLL lock time) and thermal stability over –40°C to +85°C.
JEDEC-Compliant DDR Reference Design	Embedded Control Plane Clock Tree
Use Scenario: Reference clock generation for FPGA-based DDR controller IP targeting PC2700 compliance. IC Role / Device Role / Timing Role: Pin-compatible replacement for CDC857-2/-3 in validated JEDEC DDR clock trees. Use Value: Delivers identical pinout, electrical interface, and jitter performance as CDC857 series while adding spread-spectrum support and improved industrial qualification.	Use Scenario: Low-skew clock fanout for multi-core processor I/O subsystems requiring synchronized DDR, PCIe, and SATA reference clocks. IC Role / Device Role / Timing Role: Primary clock distribution node feeding downstream clock buffers and PLLs in hierarchical timing architecture. Use Value: Provides deterministic phase alignment (±50 ps phase error) and minimal additive jitter to preserve timing margins across mixed-interface clock domains.

DDR333 Memory Subsystem

Industrial Server Memory Module

Use Scenario: Distributing synchronized clock signals to eight DDR SDRAM chips across two ranks on a single DIMM.

IC Role / Device Role / Timing Role: Zero-delay differential clock buffer generating ten matched outputs (Y0–Y9) to drive address/command/data strobes and chip-select clocks.

Use Value: Maintains <100 ps inter-output skew and <75 ps cycle-to-cycle jitter to meet DDR333 tAC and tDQS timing budgets under industrial temperature stress.

Use Scenario: Clock distribution in a ruggedized 1U server motherboard supporting ECC DDR266/333 memory with hot-swap capability.

IC Role / Device Role / Timing Role: Industrial-grade clock repeater with PD#-controlled power gating for memory power states (C3/C4).

Use Value: Enables full memory subsystem shutdown during idle cycles while retaining fast wake-up (<100 µs PLL lock time) and thermal stability over –40°C to +85°C.

JEDEC-Compliant DDR Reference Design

Embedded Control Plane Clock Tree

Use Scenario: Reference clock generation for FPGA-based DDR controller IP targeting PC2700 compliance.

IC Role / Device Role / Timing Role: Pin-compatible replacement for CDC857-2/-3 in validated JEDEC DDR clock trees.

Use Value: Delivers identical pinout, electrical interface, and jitter performance as CDC857 series while adding spread-spectrum support and improved industrial qualification.

Use Scenario: Low-skew clock fanout for multi-core processor I/O subsystems requiring synchronized DDR, PCIe, and SATA reference clocks.

IC Role / Device Role / Timing Role: Primary clock distribution node feeding downstream clock buffers and PLLs in hierarchical timing architecture.

Use Value: Provides deterministic phase alignment (±50 ps phase error) and minimal additive jitter to preserve timing margins across mixed-interface clock domains.

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential zero-delay clock buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CDC857DZ2	Same 48-pin TSSOP footprint and pinout; identical 10-output differential architecture but lacks spread-spectrum support and has higher typical cycle-to-cycle jitter (±90 ps).	Valid for legacy DDR266 designs without SSC requirements; not qualified for industrial temperature range (only commercial 0°C to 70°C).	Select CDC857DZ2 only if SSC is unused and operating temperature remains within 0°C–70°C.
ICS85310AGI-01LFT	10-output differential buffer with integrated PLL; supports wider frequency range (10–250 MHz); higher max jitter (±100 ps) and no automatic low-frequency Hi-Z mode.	Suitable for mixed DDR/PCIe clock trees; requires external logic for power-down control instead of dedicated PD# pin.	Choose ICS85310AGI-01LFT when broader frequency coverage or multi-protocol clock synthesis is needed, accepting trade-offs in jitter and control simplicity.

Compared with CDC857DZ2 and ICS85310AGI-01LFT, the CY2SSTV857ZXI-27 uniquely combines industrial temperature rating, spread-spectrum compatibility, automatic low-frequency Hi-Z, and best-in-class jitter (<±75 ps), making it optimal for new DDR333 deployments requiring robustness and EMI reduction.

Availability

CY2SSTV857ZXI-27 is available at Aetrix Electronics and suitable for DDR333 memory subsystems, industrial server memory modules, and JEDEC-compliant DDR reference designs requiring stable component supply across extended temperature and long production lifecycles.

Supply support for CY2SSTV857ZXI-27 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Spectra Linear Inc. was a fabless semiconductor company specializing in high-performance clock generation, distribution, and timing solutions before its acquisition by Microchip Technology in 2007.

The CY2SSTV857ZXI-27 belongs to Spectra Linear's SSTV family of zero-delay differential clock buffers, engineered specifically for DDR SDRAM clock distribution in industrial and server-class memory systems.

FAQ

What is the primary function of the CY2SSTV857ZXI-27 in a DDR memory system?

The CY2SSTV857ZXI-27 serves as a zero-delay differential clock buffer that distributes one differential input clock to ten matched differential output pairs for DDR266/DDR333 SDRAM devices. It uses an internal PLL with FBIN/FBOUT feedback to align output edges precisely with the input reference, eliminating propagation delay and maintaining sub-100 ps inter-output skew critical for DDR timing margins.

Does the CY2SSTV857ZXI-27 support spread-spectrum clocking (SSC)?

Yes, the CY2SSTV857ZXI-27 is explicitly designed to be spread-spectrum-compatible, supporting modulation frequencies between 30 kHz and 50 kHz with up to –0.5% down-spread without violating its specified jitter or skew limits. This capability helps reduce electromagnetic interference (EMI) in dense PCB layouts common in server and industrial memory modules.

How does the PD# pin function on the CY2SSTV857ZXI-27?

The PD# pin on the CY2SSTV857ZXI-27 is an active-low power-down control. When asserted low, it places all ten differential outputs (Y0–Y9 and their complements) into high-impedance state and powers down the PLL. When high, outputs are enabled and operate normally. This feature enables dynamic power management in memory subsystems during low-activity states.

What is the significance of AVDD versus VDDQ in the CY2SSTV857ZXI-27 power architecture?

AVDD (pin 16) supplies the PLL core and can be grounded to bypass the PLL for test mode, routing CLK directly to outputs. VDDQ (nine pins) supplies only the output buffers. This separation allows independent power sequencing, noise isolation between analog PLL and digital outputs, and fault containment - ensuring output stability even if PLL supply is compromised.

Is the CY2SSTV857ZXI-27 pin-compatible with other clock buffer families?

Yes, the CY2SSTV857ZXI-27 is pin-compatible with the CDC857-2 and CDC857-3 devices, sharing identical 48-pin TSSOP footprint, pin numbering, and signal assignments. This allows drop-in replacement in existing designs qualified with those TI parts, provided industrial temperature operation and spread-spectrum support are verified as needed.

CY2SSTV857ZXI-27 Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: Memory, DDR, SDRAM

Input:: Clock

Output:: SSTL

Number of Circuits:: 1

Ratio - Input:Output:: 1:10

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 200MHz

Voltage - Supply:: 2.375V ~ 2.625V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 48-TSSOP

CY2SSTV857ZXI-27 FAQ

1.How can I place an order for CY2SSTV857ZXI-27 through Aetrix?

Please submit a Request for Quotation (RFQ) for CY2SSTV857ZXI-27 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CY2SSTV857ZXI-27 reliable?

The price and inventory of CY2SSTV857ZXI-27 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY2SSTV857ZXI-27 is usually 5 days.

3.What payment methods are accepted for CY2SSTV857ZXI-27?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY2SSTV857ZXI-27 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY2SSTV857ZXI-27?

CY2SSTV857ZXI-27 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY2SSTV857ZXI-27 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CY2SSTV857ZXI-27?

For technical support, including CY2SSTV857ZXI-27 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY2SSTV857ZXI-27 requirements.

6.How does Aetrix verify that CY2SSTV857ZXI-27 is sourced from the original manufacturer or authorized distributors?

All CY2SSTV857ZXI-27 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY2SSTV857ZXI-27 meets industry standards.

7.What is the process for return or replacement of CY2SSTV857ZXI-27?

All CY2SSTV857ZXI-27 units undergo pre-shipment inspection (PSI). If there is an issue with CY2SSTV857ZXI-27, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CY2SSTV857ZXI-27 part is unused and in its original packaging.

Return procedure for CY2SSTV857ZXI-27:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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