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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Diodes Incorporated PI6C49021ZDIEX

Name: PI6C49021ZDIEX
Brand: Diodes Incorporated
SKU: PI6C49021ZDIEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI6C49021ZDIEX

Manufacturer:: Diodes Incorporated

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 48-VFQFN Exposed Pad

Datasheet:: PI6C49021ZDIEX.pdf

Description:: IC CLOCK GENERATOR TQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI6C49021ZDIEX from Pericom Semiconductor is a low-power, high-integration clock generator designed for PCIe 2.0, Gigabit Ethernet, USB, and embedded networking systems. It synthesizes 100MHz HCSL (3 outputs), 66.667MHz LVCMOS (2), 125MHz LVCMOS (1), 50MHz LVCMOS (2), 25MHz LVCMOS (3), 24MHz LVCMOS (1), and low-jitter 25MHz LVPECL (2) clocks from a single 25MHz crystal input, with integrated spread-spectrum control and on-chip termination.

For engineers reviewing the PI6C49021ZDIEX datasheet, PI6C49021ZDIEX pinout, PI6C49021ZDIEX application, or PI6C49021ZDIEX equivalent, key selection criteria include PCIe 2.0-compliant HCSL jitter (3.1 ps RMS), LVPECL output stability (±50 ppm crystal tolerance), I²C/SMBus programmability, and 48-pin TQFN thermal performance in space-constrained networking boards.

Technical Context

The PI6C49021ZDIEX integrates multiple PLLs - one dedicated to 100MHz PCIe HCSL outputs with spread-spectrum modulation (–0.5% or –0.75%), another for 125/50MHz LVCMOS, and separate PLLs for 66.667MHz, 24MHz, and 25MHz LVPECL generation. All outputs are independently enabled/disabled via hardware OE pins or SMBus registers.

It supports dual-mode clock input (25MHz fundamental-mode crystal across X1/X2 or single-ended reference clock), features 33Ω series-terminated HCSL outputs compliant with PCIe 2.0 electrical specs, and delivers <3 ps RMS phase jitter on 100MHz outputs using the PCIe measurement method - critical for Gen2 link reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.3 V ±5% - ensures compatibility with standard logic rails and stable PLL operation across industrial temperature range.
Input Frequency	25 MHz crystal or clock - enables single-source timing architecture reducing BOM count and board area.
PCIe HCSL Output Jitter	3.1 ps RMS (PCIe 2.0 method) - meets Gen2 eye diagram closure requirements without external jitter cleaners.
LVPECL Output Stability	±50 ppm frequency tolerance - maintains Ethernet PHY synchronization under ambient thermal drift.
Spread Spectrum Control	–0.5% or –0.75% down-spread - reduces EMI peak emissions in dense PCB layouts without affecting link training.
I²C Address	0xD2 (7-bit) - allows multi-device SMBus configuration in systems with multiple clock generators.
Power Consumption	197–230 mA typical - optimized for low-thermal-load embedded designs with limited airflow.

Pinout & Package

PI6C49021ZDIEX is housed in a Pb-free, green 48-pin Thin Quad Flat No-Lead (TQFN) package (ZD48), featuring an exposed thermal pad for enhanced heat dissipation and signal integrity. Pin layout follows JEDEC MO-220/VKKD standards with dedicated VDD/GND pairs per functional block.

Pin/Terminal	Circuit Role	Design Meaning
X1 / X2	Crystal oscillator interface	Supports 25MHz fundamental-mode crystal (CL = 18 pF); X2 floats when using external clock input.
PCIE0–PCIE2#, PECL_25M0–PECL_25M1#	Differential clock outputs	HCSL outputs include integrated 33Ω series termination; LVPECL outputs require external 150Ω pull-down for proper common-mode voltage.
OE_PCIE / OE_PECL	Hardware enable controls	Asynchronous active-high enables allow dynamic power gating of PCIe or LVPECL outputs during system sleep states.
SCLK / SDATA	I²C/SMBus interface	Supports indexed block read/write for register-level control of output enables, spread spectrum, and reset behavior.
VDD Pins (5,7,8,12,21,26,28,31,32,36,39,42,43,46)	Domain-specific power rails	Isolated VDD groups supply dedicated PLLs and output buffers - prevents noise coupling between PCIe, Ethernet, and USB clock domains.

Key Features

Feature	Design Value
Integrated 33Ω HCSL termination	Eliminates need for 6 external 33Ω resistors per PCIe lane, reducing layout complexity and improving signal fidelity.
Independent output enables	14 individually controllable outputs via hardware OE pins or SMBus registers - enables flexible power sequencing and dynamic clock tree management.
Multi-PLL architecture	Five independent PLLs prevent jitter accumulation across frequency domains (e.g., PCIe vs. Ethernet vs. USB), preserving timing margin.
LVPECL low-jitter synthesis	25MHz differential outputs achieve ≤2 ps RMS jitter (12 kHz–5 MHz) - satisfies IEEE 802.3 compliance for 100BASE-TX and 1000BASE-T PHYs.
Thermal pad + decoupling guidance	Exposed pad connected to GND plane with >8 vias + local 0.1/1/2.2 µF capacitors per VDD pin - ensures stable operation at full load over –40°C to +85°C.

Applications

PCIe 2.0 Add-in Card Timing

Gigabit Ethernet Switch Fabric

Use Scenario: Providing synchronized 100MHz HCSL clocks to three PCIe 2.0 slots on a server backplane with spread-spectrum EMI reduction.

IC Role / Device Role / Timing Role: Primary clock generator with integrated termination and independent OE control per lane.

Use Value: Eliminates external fanout buffer and reduces trace length mismatch - improves Gen2 link training success rate above 99.8%.

Use Scenario: Driving 125MHz LVCMOS clocks to multiple Ethernet MACs and 25MHz LVPECL clocks to PHYs in a 24-port managed switch.

IC Role / Device Role / Timing Role: Multi-frequency clock source with domain-isolated PLLs and jitter-optimized differential outputs.

Use Value: Maintains sub-150 ps peak-to-peak jitter on 125MHz outputs and ±50 ppm stability on 25MHz LVPECL - ensures IEEE 802.3 compliance across all ports.

Embedded USB 2.0 + Ethernet SoC Platform

Industrial Network Appliance

Use Scenario: Supplying 24MHz LVCMOS to USB 2.0 transceivers and 25MHz LVCMOS to Ethernet PHYs on a single-board computer with shared crystal.

IC Role / Device Role / Timing Role: Single-crystal, multi-output timing hub replacing discrete oscillators and buffers.

Use Value: Reduces component count by 7 parts and board area by 28 mm² versus discrete solution - lowers assembly cost and test time.

Use Scenario: Generating robust 66.667MHz CPU clocks and 50MHz CPLD clocks in a DIN-rail mounted controller operating continuously at 75°C ambient.

IC Role / Device Role / Timing Role: Industrial-grade clock generator with extended temperature support and domain-specific power rail isolation.

Use Value: Delivers <6 ms clock stabilization after cold power-up and maintains <±300 ppm period accuracy with spread spectrum disabled - ensures deterministic boot timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT 8T49N241	Programmable femto-clock with fractional-N synthesis; supports 0.1 ppb resolution but requires external crystal oscillator.	Targeted at telecom sync (SyncE/IEEE 1588); lacks native PCIe HCSL outputs and integrated termination.	Select when ultra-low jitter (<100 fs) and frequency agility outweigh PCIe integration needs.
Si5332A-D-GM	Multi-output clock generator with DCO-based jitter cleaning; supports PCIe Gen3/Gen4 but no native LVPECL outputs.	Focused on high-speed serial links (PCIe, SATA, USB3); requires external level-shifting for LVPECL interfaces.	Choose for future-proofing to PCIe Gen4 or when combining clock generation with jitter attenuation is required.

Compared with IDT 8T49N241 and Si5332A-D-GM, the PI6C49021ZDIEX offers superior cost-performance for PCIe 2.0 + Ethernet + USB embedded systems due to its integrated HCSL termination, native LVPECL outputs, and single-crystal multi-domain architecture - eliminating external components and simplifying layout validation.

Availability

PI6C49021ZDIEX is available at Aetrix Electronics and suitable for PCIe add-in cards, Gigabit Ethernet switches, embedded USB/Ethernet platforms, and industrial network appliances requiring stable component supply and long-term lifecycle support.

Supply support for PI6C49021ZDIEX 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 markets.

The PI6C49021 belongs to Pericom's low-power clock generator product line, engineered specifically for cost-sensitive, space-constrained embedded networking applications requiring PCIe 2.0 compliance and multi-protocol clock distribution.

FAQ

What crystal specifications are required for reliable PI6C49021ZDIEX operation?

The device requires a 25MHz fundamental-mode crystal with 18pF load capacitance (CL), ±30ppm or better frequency tolerance, and drive-level rating ≥100µW. Recommended parts include SaRonix-eCera CG2500003 and Pericom FY2500081. C1/C2 load capacitors should be set to 27pF each for CL=18pF crystals, adjusted per board parasitics to maintain ±50ppm system accuracy.

How does the PI6C49021ZDIEX handle PCIe 2.0 spread-spectrum clocking requirements?

It implements hardware-selectable down-spread modulation at –0.5% or –0.75% with 32kHz modulation frequency, fully compliant with PCIe Base Specification 1.1. Spread spectrum is applied only to the three 100MHz HCSL outputs (PCIE0–PCIE2) and can be enabled/disabled independently via SMBus register Byte 1, Bit[1:0] or hardware SS0/SS1 pins.

Can the LVPECL outputs drive standard Ethernet PHYs without external level-shifting?

Yes - the 25MHz LVPECL outputs (PECL_25M0/PECL_25M1) deliver V_OH = V_DD–0.9V and V_OL = V_DD–2.0V (at V_DD = 3.3V), meeting IEEE 802.3 common-mode voltage requirements for 100BASE-TX and 1000BASE-T PHYs when terminated with 150Ω to V_CC–2V (typically 1.3V).

What is the recommended power supply decoupling strategy for the PI6C49021ZDIEX?

Place 0.1µF ceramic capacitors within 2mm of each VDD pin, supplemented by 1µF and 2.2µF bulk capacitors near the thermal pad. Connect all 14 GND pins directly to a solid ground plane via >8 thermal vias under the exposed pad. Avoid daisy-chaining decoupling paths - each VDD domain must have its own localized LC filter to suppress cross-domain noise coupling.

PI6C49021ZDIEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 48-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: -

PLL:: Yes

Input:: Crystal

Output:: LVCMOS, LVPECL

Number of Circuits:: 1

Ratio - Input:Output:: 1:14

Differential - Input:Output:: No/Yes

Frequency - Max:: 100MHz

Divider/Multiplier:: No/Yes

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 48-TQFN (7x7)

PI6C49021ZDIEX FAQ

1.How can I place an order for PI6C49021ZDIEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI6C49021ZDIEX 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 PI6C49021ZDIEX reliable?

The price and inventory of PI6C49021ZDIEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C49021ZDIEX is usually 5 days.

3.What payment methods are accepted for PI6C49021ZDIEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C49021ZDIEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI6C49021ZDIEX?

PI6C49021ZDIEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI6C49021ZDIEX 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 PI6C49021ZDIEX?

For technical support, including PI6C49021ZDIEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C49021ZDIEX requirements.

6.How does Aetrix verify that PI6C49021ZDIEX is sourced from the original manufacturer or authorized distributors?

All PI6C49021ZDIEX 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 PI6C49021ZDIEX meets industry standards.

7.What is the process for return or replacement of PI6C49021ZDIEX?

All PI6C49021ZDIEX units undergo pre-shipment inspection (PSI). If there is an issue with PI6C49021ZDIEX, 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 PI6C49021ZDIEX part is unused and in its original packaging.

Return procedure for PI6C49021ZDIEX:

1.Submit a request within 90 days.

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

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