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

Diodes Incorporated PI6C557-10LEX

Name: PI6C557-10LEX
Brand: Diodes Incorporated
SKU: PI6C557-10LEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI6C557-10LEX

Manufacturer:: Diodes Incorporated

Category:: Application Specific Clock/Timing

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI6C557-10LEX.pdf

Description:: IC CLOCK GENERATOR 16TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI6C557-10LEX from Pericom Semiconductor is a dual-output network clock generator IC that synthesizes 100MHz differential (LVDS-compatible) and 33.3MHz LVCMOS clocks from a 25MHz fundamental-mode quartz crystal. It features separate analog/digital/33MHz power domains, 60ps typical cycle-to-cycle jitter at 100MHz, and operates across –40°C to +85°C industrial temperature range. Used in PCI Express Gen 1 timing subsystems.

For engineers reviewing the PI6C557-10LEX datasheet, PI6C557-10LEX pinout, PI6C557-10LEX application, or PI6C557-10LEX equivalent, key selection criteria include its dual-rail supply partitioning, differential output voltage (400–850mV), common-mode voltage (1.0–1.6V), 33MHz LVCMOS drive strength (±6mA), and OE-controlled tristate capability for system-level clock gating.

Technical Context

The PI6C557-10LEX integrates a proven PLL-based frequency multiplier architecture optimized for PCIe Gen 1 compliance, accepting a 25MHz crystal input and generating synchronized 100MHz differential and 33.3MHz LVCMOS outputs. Its phase jitter is specified at 86ps pk-pk (1E-6 BER) for PCIe Gen 1 and 60ps cycle-to-cycle (typ) at 100MHz.

Power domain separation includes dedicated VDDA/GNDA for analog PLL core, VDDX/GNDX for crystal oscillator circuit, and VDD33/GND33 for LVCMOS output stage - enabling low-noise operation and minimizing cross-coupling between high-speed differential and digital logic outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Frequency	25MHz fundamental-mode crystal reference; enables precise, low-jitter synthesis without external oscillator
Differential Output	100MHz LVDS-compatible; 400–850mV differential swing, 1.0–1.6V common-mode, supports 100Ω termination
LVCMOS Output	33.3MHz; ±6mA drive strength, 45–55% duty cycle, 3–4ns rise/fall time into 10pF load
Jitter Performance	60ps cycle-to-cycle (typ) at 100MHz; 86ps pk-pk (1E-6 BER) for PCIe Gen 1 link integrity
Supply Configuration	Single 3.3V ±5% rail with 4 independent power pins: VDDA, VDDX, VDD33, VDD - enables noise-isolated layout
Operating Temp	–40°C to +85°C industrial grade; validated for sustained operation in embedded networking and storage systems
Output Enable	Active-low OE pin (internal 30kΩ pull-down); simultaneously tristates both 100MHz and 33MHz outputs

Pinout & Package

Package: 16-pin, 4.4 × 5.0 mm TSSOP (Pb-free & Green, package code L), 173 mils wide, JEDEC MO-153F/AB compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 GNDA	Analog Ground	Reference return for PLL and crystal oscillator analog circuitry; must be isolated from digital ground planes
2 VDDA	Analog Power	Clean 3.3V supply for PLL core; requires local 0.01μF decoupling adjacent to pin
3 VDDX	Crystal Power	Supply for crystal driver circuit; separates oscillator noise from PLL and output stages
4 XIN	Clock Input	Crystal or external 25MHz clock input; high-impedance CMOS input with 5pF capacitance
5 XOUT	Clock Output	Crystal oscillator feedback output; connects directly to crystal's second terminal
6 GNDX	Crystal Ground	Dedicated ground return for crystal oscillator; minimizes phase noise coupling
7 GND	Digital Ground	Main system ground reference; ties together VDD, VDD33, and output stage returns
8 VDD	Digital Core Power	Primary 3.3V supply for digital logic and OE control circuitry
9 GND33	LVCMOS Ground	Isolated ground for 33MHz output driver; prevents switching noise from corrupting differential output
10 33M	LVCMOS Output	33.3MHz CMOS clock output; 0.4V/2.4V logic levels, ±6mA drive, 45–55% duty cycle
11 VDD33	LVCMOS Power	Dedicated 3.3V rail for 33MHz output stage; improves signal integrity and reduces crosstalk
12 VDD	Digital Core Power	Secondary VDD connection; provides additional current path for digital logic
13 100M	Differential Output+	Positive leg of 100MHz LVDS-compatible differential pair; 400–850mV swing, 100Ω termination required
14 100M	Differential Output–	Negative leg of 100MHz differential pair; complements Pin 13 for balanced transmission
15 GND	Digital Ground	Additional ground connection; enhances thermal dissipation and reduces ground bounce
16 OE	Output Enable	Active-low enable; pulls both 100MHz and 33MHz outputs to high-impedance when HIGH (internal 30kΩ pull-down)

Key Features

Feature	Design Value
Dual independent clock outputs	Simultaneous 100MHz differential and 33.3MHz LVCMOS from single 25MHz crystal - eliminates need for multiple oscillators
Multi-rail power partitioning	Four dedicated supply pins (VDDA, VDDX, VDD33, VDD) reduce supply-induced jitter and improve EMI margin
PCIe Gen 1–compliant timing	86ps pk-pk phase jitter (1E-6 BER) meets PCIe Gen 1 clock specification for reliable link training
OE-controlled tristate	Single-pin global disable of both outputs enables dynamic clock gating in power-managed systems
Industrial temperature support	Validated operation from –40°C to +85°C ensures reliability in telecom, storage, and industrial control environments

Applications

PCI Express Gen 1 Root Complex

Embedded Network Switch Timing

Use Scenario: Clocking the root complex controller and upstream PCIe endpoints in server motherboard designs.

IC Role / Device Role / Timing Role: Primary clock source generating reference clocks for PCIe PHY layers and configuration logic.

Use Value: Meets PCIe Gen 1 jitter spec (86ps pk-pk) while eliminating external clock buffers via integrated dual-output architecture.

Use Scenario: Providing synchronous timing for multi-port Ethernet switch ASICs and packet buffer controllers.

IC Role / Device Role / Timing Role: System-level clock generator delivering 100MHz for SerDes lanes and 33MHz for management interfaces.

Use Value: Independent power domains prevent switching noise from 33MHz logic from degrading 100MHz SerDes timing integrity.

Industrial Storage Controller

Telecom Baseband Processing

Use Scenario: Timing SATA host controllers and flash memory interface logic in ruggedized storage modules.

IC Role / Device Role / Timing Role: Dual-rail clock source supporting both high-speed data paths (100MHz) and firmware execution clocks (33MHz).

Use Value: –40°C to +85°C operation and robust 25MHz crystal interface ensure long-term stability in thermally constrained enclosures.

Use Scenario: Synchronizing baseband DSPs and FPGA fabric in LTE small cell radio units.

IC Role / Device Role / Timing Role: Low-jitter clock generator feeding ADC/DAC sampling clocks and control logic timing.

Use Value: 60ps cycle-to-cycle jitter at 100MHz enables clean sampling windows for 20MHz LTE channel bandwidths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICS8430I-01T	Generates 100MHz LVDS + 25MHz LVCMOS; uses internal PLL but lacks separate VDDX/GNDX for crystal	Less suitable for crystal-based designs requiring ultra-low phase noise; higher integrated jitter (120ps pk-pk)	Select when board space permits external crystal buffer and jitter tolerance >100ps is acceptable
Si5338A-D-GM	Programmable 4-output clock generator; supports 25MHz crystal input but requires I²C configuration; higher BOM cost	Enables flexible frequency synthesis but adds firmware dependency and startup delay vs. fixed-frequency PI6C557-10LEX	Select when multi-frequency reconfiguration or spread-spectrum capability is required

Compared with ICS8430I-01T and Si5338A-D-GM, the PI6C557-10LEX delivers lower jitter, simpler crystal interface, and deterministic startup - making it optimal for cost-sensitive, fixed-frequency PCIe and networking applications where design-in simplicity and supply-chain stability are critical.

Availability

PI6C557-10LEX is available at Aetrix Electronics and suitable for PCI Express Gen 1 root complexes, embedded network switches, industrial storage controllers, and telecom baseband processing systems requiring stable component supply and long-lifecycle support.

Supply support for PI6C557-10LEX 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

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-performance timing, interface, and signal-integrity solutions for communications and computing infrastructure.

The PI6C557-10LEX belongs to Pericom's network clock generator product line, designed specifically to meet PCIe Gen 1 timing requirements with minimal external components and deterministic jitter performance.

FAQ

What crystal specifications are recommended for the PI6C557-10LEX?

Pericom recommends the SRX7278 25MHz fundamental-mode AT-cut crystal: ±20ppm frequency tolerance, ±30ppm temperature and aging stability, 20pF load capacitance, 35Ω ESR, and 100μW drive level. Using this crystal ensures optimal phase noise and jitter performance per the datasheet's 86ps pk-pk PCIe Gen 1 specification.

Can the PI6C557-10LEX operate with an external 25MHz clock instead of a crystal?

Yes - Pin 4 (XIN) accepts a 25MHz CMOS-level clock signal. The internal crystal driver circuit is bypassed when an external clock is applied; XOUT (Pin 5) must be left unconnected or terminated. No configuration change is needed, but ensure input rise/fall times meet <5ns and voltage levels comply with VIH/VIL specs (2.0V–VDD+0.3V / GND–0.3V–0.8V).

How should decoupling capacitors be placed for optimal jitter performance?

Place a 0.01μF ceramic capacitor between each VDD pin (VDDA, VDDX, VDD33, VDD) and its respective ground pin (GNDA, GNDX, GND33, GND) - with capacitor body ≤2mm from the pin. Avoid shared vias; use dedicated ground planes per domain. This layout reduces supply-induced modulation of the PLL and crystal oscillator, directly lowering measured cycle-to-cycle jitter.

Is the PI6C557-10LEX pin-compatible with other Pericom clock generators?

No - the PI6C557-10LEX has a unique 16-pin TSSOP pinout optimized for power domain isolation (e.g., separate VDDA, VDDX, VDD33). It is not pin-compatible with PI6C20200 or PI6C557-01. Migration requires PCB layout revision and validation of power sequencing, especially for OE assertion timing and VDD ramp rates across four supply domains.

PI6C557-10LEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: PCI Express (PCIe)

Input:: LVCMOS, Crystal

Output:: LVCMOS

Number of Circuits:: 1

Ratio - Input:Output:: 1:2

Differential - Input:Output:: No/Yes

Frequency - Max:: 100MHz

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-TSSOP

PI6C557-10LEX FAQ

1.How can I place an order for PI6C557-10LEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI6C557-10LEX 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 PI6C557-10LEX reliable?

The price and inventory of PI6C557-10LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C557-10LEX is usually 5 days.

3.What payment methods are accepted for PI6C557-10LEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C557-10LEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI6C557-10LEX?

PI6C557-10LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI6C557-10LEX 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 PI6C557-10LEX?

For technical support, including PI6C557-10LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C557-10LEX requirements.

6.How does Aetrix verify that PI6C557-10LEX is sourced from the original manufacturer or authorized distributors?

All PI6C557-10LEX 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 PI6C557-10LEX meets industry standards.

7.What is the process for return or replacement of PI6C557-10LEX?

All PI6C557-10LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI6C557-10LEX, 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 PI6C557-10LEX part is unused and in its original packaging.

Return procedure for PI6C557-10LEX:

1.Submit a request within 90 days.

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

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