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HomeProductsIntegrated Circuits (ICs)Clock/Timing - Clock Generators, PLLs, Frequency SynthesizersCDCV857BDGGRG4
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CDCV857BDGGRG4 - Texas Instruments

Manufacturer Part Number
CDCV857BDGGRG4
Manufacturer
Texas Instruments
Allelco Part Number
32D-CDCV857BDGGRG4
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
10,820 pcs available, New & Original
Parts Description
IC PLL CLOCK DRIVER 48TSSOP
Package
48-TSSOP
Data sheet
CDCV857BDGGRG4.pdf

Datasheets

CDCV857B(I).pdf

PCN Obsolescence/ EOL

CDCV85y EOL 11/Dec/2018.pdf
RoHs Status
ROHS3 Compliant
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In stock: 10820

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Specifications

CDCV857BDGGRG4 Tech Specifications
Texas Instruments - CDCV857BDGGRG4 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - CDCV857BDGGRG4

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply 2.3V ~ 2.7V
Type PLL Clock Driver
Supplier Device Package 48-TSSOP
Series -
Ratio - Input:Output 1:10
Package / Case 48-TFSOP (0.240", 6.10mm Width)
Package Tape & Reel (TR)
PLL Yes with Bypass
Product Attribute Attribute Value
Output Clock
Operating Temperature 0°C ~ 85°C
Number of Circuits 1
Mounting Type Surface Mount
Input Clock
Frequency - Max 200MHz
Divider/Multiplier No/No
Differential - Input:Output Yes/Yes
Base Product Number CDCV857

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 2 (1 Year)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

CDCV857BDGGRG4 Image
CDCV857BDGGRG4 (1)

Manufacturer Part Number CDCV857BDGGRG4

Manufacturer: texas-instruments

Manufacturer Part Number

CDCV857BDGGRG4

Introduction

The CDCV857BDGGRG4 is a high-performance PLL clock driver that provides a low-jitter clock signal from a single-ended or differential clock input. It features a 1:10 input to output frequency ratio, making it suitable for a variety of applications, including servers, storage, and networking equipment.

Product Features and Performance

PLL with bypass mode

Differential input and output

1:10 input to output frequency ratio

Maximum frequency of 200 MHz

3V to 2.7V supply voltage

0°C to 85°C operating temperature range

Product Advantages

Low-jitter clock signal

Flexible input and output configurations

Wide operating frequency range

Low power consumption

Key Reasons to Choose This Product

Reliable and high-performance clock generation

Suitable for a wide range of applications

Compact surface mount package

Cost-effective solution

Quality and Safety Features

Manufactured using high-quality materials

Rigorous testing and quality control

Complies with industry safety standards

Compatibility

The CDCV857BDGGRG4 is compatible with a variety of clock input and output configurations, making it suitable for use in a wide range of electronic devices and systems.

Application Areas

Servers

Storage systems

Networking equipment

Industrial automation

Telecommunications

Product Lifecycle

The CDCV857BDGGRG4 is an obsolete product, meaning it is no longer in active production. However, there may be equivalent or alternative models available from Texas Instruments or other manufacturers. Customers are advised to contact our website's sales team for more information on current product offerings and availability.

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the CDCV857BDGGRG4 that make it suitable for high-speed clock distribution in 2.5V systems?
The CDCV857BDGGRG4 operates over a supply voltage range of 2.3V to 2.7V, making it compatible with 2.5V digital logic environments commonly used in modern communication and computing platforms. Its maximum operating frequency of 200MHz enables precise timing control in applications such as baseband processing or Ethernet PHY interfaces. The device features differential input and output stages, which enhance noise immunity—a critical requirement when routing high-speed clock signals across printed circuit boards. With a ratio of 1:10, it supports fan-out from a single reference clock source to multiple downstream components while maintaining signal integrity. These parameters collectively ensure reliable performance in space-constrained, power-sensitive designs.
How does the CDCV857BDGGRG4 compare to alternative clock drivers when considering phase noise and jitter performance?
While the datasheet does not publish absolute phase noise figures, the CDCV857BDGGRG4 incorporates a low-jitter PLL architecture optimized for clean clock multiplication and distribution. Compared to simpler buffer-only alternatives, this integrated PLL provides superior jitter reduction through internal feedback loop filtering and deterministic delay matching. In typical system-level comparisons, devices like the CDCE913 or LMK series offer lower integrated jitter but require external loop filters; the CDCV857BDGGRG4 trades some flexibility for integration benefits, delivering acceptable jitter performance (often under 1 ps RMS) suitable for most synchronous digital designs without additional compensation circuitry.
Can the CDCV857BDGGRG4 be used in applications requiring hot-plug or redundant clock sources?
No, the CDCV857BDGGRG4 is not designed for hot-swapping or redundant clock topologies. Its internal charge pump and VCO structures lack built-in protection against sudden input transitions or voltage surges associated with hot insertion. Additionally, there is no explicit support for hitless switching between primary and secondary clocks. Implementing such functionality would require external arbitration logic and level-shifting circuits, increasing board complexity and risk. For applications demanding failover capability, consider using dedicated clock switch-over ICs in conjunction with the CDCV857BDGGRG4 only after ensuring stable input conditions.
What layout considerations are critical when placing the CDCV857BDGGRG4 on a PCB to maintain signal integrity up to 200MHz?
Due to its differential signaling and high-speed operation, the CDCV857BDGGRG4 demands careful PCB layout practices. Maintain tightly coupled differential pairs with controlled impedance (typically 100Ω) using consistent trace spacing and dielectric thickness. Minimize stub lengths and avoid vias in the differential paths to reduce reflections. Place bypass capacitors as close as possible to the VCC pins—preferably within 2 mm—using low-ESL types such as 0402 X7R ceramics rated at 2.5V. Ground plane continuity beneath the package is essential to minimize ground bounce. Routing should also isolate clock lines from noisy digital nets to prevent crosstalk-induced timing errors.
Is the CDCV857BDGGRG4 suitable for use in industrial temperature environments beyond its specified 0°C to 85°C range?
The CDCV857BDGGRG4 is qualified for operation only within the commercial temperature range of 0°C to 85°C. Operating outside this window—such as in harsh industrial settings spanning -40°C to +85°C or higher—risks parametric drift, increased jitter, or functional failure due to semiconductor junction behavior. Although Texas Instruments may offer extended-temperature variants under different part numbers, this specific model does not guarantee reliability beyond its stated limits. Designers targeting broader environmental compliance must select alternate components explicitly rated for wider thermal ranges.
How does the absence of programmable divider/multiplier affect system design flexibility when using the CDCV857BDGGRG4?
The fixed 1:10 ratio and lack of internal integer-N divider limit the CDCV857BDGGRG4’s ability to generate arbitrary output frequencies from a given input. This constraint simplifies calibration but reduces adaptability across diverse clock trees. For example, if an application requires a 50 MHz output from a 10 MHz reference, a 1:5 multiplier is needed—something this device cannot provide. Consequently, designers must either accept the fixed scaling factor or incorporate external frequency synthesis stages, adding component count and potential jitter sources. This trade-off favors simplicity in applications where exact 10x multiplication suffices.
What is the impact of moisture sensitivity level (MSL) rating on manufacturing handling for the CDCV857BDGGRG4?
The CDCV857BDGGRG4 has an MSL rating of 2, indicating it is sensitive to moisture absorption and must be handled per JEDEC J-STD-020 guidelines. After opening the moisture-barrier bag, the device has a floor life of one year at 30°C/60% RH before assembly reflow. Exceeding this window risks popcorning during soldering, leading to delamination and catastrophic failure. Manufacturers must track time-to-reflow using real-time clocks or humidity indicators and bake parts if necessary. Proper ESD and moisture controls during storage significantly extend usable shelf life and ensure process reliability.
How does the CDCV857BDGGRG4 handle power-up sequencing, and what precautions should be taken during startup?
The CDCV857BDGGRG4 does not include automatic power-on reset circuitry for its PLL. Therefore, designers must ensure stable supply voltages reach the minimum of 2.3V before asserting the clock input. Abrupt power ramping or brownout conditions can cause the internal VCO to lock unpredictably, resulting in erratic outputs. A recommended practice is to sequence power rails monotonically and allow sufficient settling time (typically >1 ms) before enabling clock inputs. Monitoring supply ripple with adequate decoupling further stabilizes the reference oscillator during transient events.
Can the CDCV857BDGGRG4 operate with asynchronous inputs while maintaining deterministic output timing?
Yes, the CDCV857BDGGRG4 accepts asynchronous differential clock inputs and translates them into a synchronized internal clock domain. However, this transition introduces a small but finite latency—typically several nanoseconds—as the PLL re-acquires phase lock. During this acquisition period, output jitter may increase slightly. For time-critical applications requiring sub-nanosecond synchronization guarantees, external deskew buffers or synchronous input conditioning should be considered. Nevertheless, for most digital systems where asynchronous references are common, the CDCV857BDGGRG4 provides robust translation with acceptable overhead.
What are the consequences of exceeding the maximum frequency specification of 200MHz on the CDCV857BDGGRG4?
Operating the CDCV857BDGGRG4 above 200MHz violates its guaranteed specifications and risks immediate functional degradation or permanent damage. At frequencies beyond this threshold, the internal loop bandwidth becomes insufficient to stabilize the VCO, leading to unlocked operation, excessive phase error, or complete loss of output. Even brief excursions past 200MHz can degrade long-term stability due to nonlinearities in the charge pump or reference divider. Reliability models indicate accelerated aging effects when driven beyond nominal limits, reducing mean time between failures in production deployments.
How does the CDCV857BDGGRG4 compare to standalone clock buffers in terms of power consumption and footprint efficiency?
Relative to pure clock buffers lacking PLL functionality, the CDCV857BDGGRG4 consumes marginally more power due to its integrated phase-locked loop—typically around 3–5 mA at 2.5V. However, it eliminates the need for external crystal oscillators or reference clocks, saving board space and bill-of-materials cost. In dense FPGA or SoC layouts where routing congestion is a concern, the integrated solution often delivers better area efficiency despite higher quiescent current. Trade-offs depend on whether the added jitter budget justifies the reduced component count.
Are there any known limitations regarding electromagnetic compatibility (EMC) when using the CDCV857BDGGRG4 in compact form factors?
The CDCV857BDGGRG4 generates moderate radiated emissions near its upper frequency limit due to high-speed switching edges. Without proper shielding or filtering, it may violate FCC Part 15 or EN 55022 Class B standards in unshielded enclosures. Mitigation strategies include using ferrite beads on power rails, limiting rise/fall times via series resistors, and enclosing clock traces in grounded guard rings. Testing in representative end-use environments is strongly advised, especially in handheld or portable devices where proximity to antennas amplifies susceptibility risks.
What role does the bypass mode play in the CDCV857BDGGRG4, and how is it implemented?
The CDCV857BDGGRG4 supports a bypass mode that disables the internal PLL and routes the input clock directly to the output with minimal delay. This feature allows fallback operation during system diagnostics or when ultra-low jitter propagation is required without frequency multiplication. Bypass is typically enabled by pulling a dedicated pin low or configuring internal registers (if available); however, the datasheet specifies only hardware-controlled bypass via an external pin. Designers should verify timing closure in bypass mode, as path delays differ from locked PLL conditions.
How does the RoHS3 compliance status influence material selection and regulatory reporting for the CDCV857BDGGRG4?
RoHS3 compliance confirms the CDCV857BDGGRG4 adheres to Directive 2015/863/EU, restricting four phthalates beyond standard RoHS metals. This affects supply chain documentation and conflict mineral disclosures but imposes no direct design changes. Manufacturers must ensure full traceability of compliant materials throughout assembly, particularly in lead-free solder processes. While RoHS3 doesn’t alter electrical performance, it ensures alignment with global green manufacturing policies and avoids customs penalties in regulated markets.
What testing methodology is recommended to validate the CDCV857BDGGRG4’s jitter performance in prototype builds?
Validate jitter using a calibrated high-bandwidth oscilloscope with low-jitter input probes, preferably equipped with RMS cycle-to-cycle measurement capabilities. Apply a clean reference clock (e.g., <0.5 ps RMS jitter) at the rated frequency and measure output jitter over 1,000 cycles. Compare results against the datasheet’s typical values under identical supply and load conditions. Include worst-case scenarios such as temperature extremes and supply ripple to stress-test robustness. Avoid averaging algorithms that mask burst noise patterns indicative of instability.
Can the CDCV857BDGGRG4 drive multiple loads simultaneously without degradation in signal quality?
The CDCV857BDGGRG4 provides sufficient drive strength for up to 10 balanced loads at 200MHz, as implied by its 1:10 ratio and output buffer design. However, capacitive loading beyond this point causes rise/fall time degradation and eye diagram closure, especially over long traces. If more than 10 destinations are required, consider cascading additional buffers or replacing the CDCV857BDGGRG4 with a multi-drop-capable driver. Impedance matching and termination strategies become critical when driving parallel loads to preserve signal fidelity.
What is the significance of the 48-TFSOP package dimensions for mechanical integration of the CDCV857BDGGRG4?
The 48-pin TFSOP package measures 6.10mm x 10.16mm with a 0.5mm pitch, offering a balance between pin density and soldering accessibility. Its thin profile suits compact PCBs, but thermal resistance (θJA) remains relatively high (~45°C/W), necessitating careful PCB copper pour for heat dissipation. Mechanical stress from repeated thermal cycling could compromise solder joints near corners; hence, avoiding flexure-prone mounting zones is advisable. Alternative packages like QFN may offer better thermal performance but require more advanced assembly techniques.
How should the CDCV857BDGGRG4 be evaluated for use in automotive-grade clock distribution systems?
Automotive qualification exceeds the CDCV857BDGGRG4’s current certification scope, which covers commercial temperatures only. To meet AEC-Q100 Grade 2 (up to 105°C) or Grade 1 (-40°C to +125°C), Texas Instruments would need to perform additional reliability screening including HAST, HTOL, and random vibration tests. Until such variants exist, the CDCV857BDGGRG4 cannot be reliably deployed in safety-relevant automotive subsystems without formal derating analysis and risk mitigation plans approved by system architects.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments CDCV857BDGGRG4

Product Attribute CDCV857BIDGGRG4 CDCV857BIDGGG4 CDCV857ADGGRG4 CDCV857DGGRG4
Part Number CDCV857BIDGGRG4 CDCV857BIDGGG4 CDCV857ADGGRG4 CDCV857DGGRG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
PLL - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Type - - - -
Voltage - Supply - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Input - - - -
Series - - - -
Output - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Frequency - Max - - - -
Number of Circuits - - - -
Divider/Multiplier - - - -
Ratio - Input:Output - - - -
Differential - Input:Output - - - -

CDCV857BDGGRG4 Datasheet PDF

Download CDCV857BDGGRG4 pdf datasheets and Texas Instruments documentation for CDCV857BDGGRG4 - Texas Instruments.

Datasheets
CDCV857B(I).pdf
PCN Obsolescence/ EOL
CDCV85y EOL 11/Dec/2018.pdf
PCN Packaging
TSSOP Carrier Tape Chg 1/Sep/2016.pdf

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CDCV857BDGGRG4 Image

CDCV857BDGGRG4

Texas Instruments
32D-CDCV857BDGGRG4

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