My Inquiry
My Account
Diodes Incorporated PI6C557-01BZHIEX
- Part No.:
- PI6C557-01BZHIEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Application Specific Clock/Timing
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
PI6C557-01BZHIEX.pdf
- Description:
- C CLOCK GENERATOR 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,891
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PI6C557-01BZHIEX from Diodes Incorporated (acquired Pericom) is a PCIe 3.0-compliant spread spectrum clock generator with one HCSL differential output pair, accepting a 25 MHz crystal or clock input and generating 100 MHz HCSL outputs. It supports -0.5% spread or no spread via SS1 pin control, operates at 3.3 V ±10%, and targets EMI reduction in PC and embedded PCIe timing systems.
For engineers reviewing the PI6C557-01BZHIEX datasheet, PI6C557-01BZHIEX pinout, PI6C557-01BZHIEX application, or PI6C557-01BZHIEX equivalent, key selection criteria include PCIe 3.0 RMS jitter compliance (≤3 ps), HCSL/LVDS dual-mode output configuration, spread-spectrum enablement via external pin, industrial temperature range (-40°C to +85°C), and 16-pin TQFN (ZH) package compatibility.
Technical Context
The device implements a proprietary Phase-Locked Loop architecture optimized for PCIe 3.0 spectral purity, with low-bandwidth PLL filtering (L-BW ≤3 ps) and high-bandwidth jitter suppression (H-BW ≤1 ps) to meet stringent phase noise requirements. Its spread spectrum modulation operates at 30–33 kHz with selectable -0.5% down-spread or bypass mode.
It delivers HCSL-compatible differential outputs (VOH = 660–900 mV, VOL = -150–0 mV, crossing point 250–550 mV) with 35 ps cycle-to-cycle jitter (typ) and 0.45 ps RMS phase jitter (high-frequency band), while supporting LVDS-level routing via external termination networks per PCI-SIG layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 100 MHz - precisely locked to 25 MHz reference via integer-N PLL for PCIe Gen3 link clocking |
| Input Frequency | 25 MHz - accepts fundamental-mode parallel-resonant crystal or CMOS clock signal |
| Supply Voltage | 3.3 V ±10% - requires dual 3.3 V rails (VDD and VDDA) with local 0.01 µF decoupling per pin |
| Output Type | HCSL differential pair - open-source current-mode driver (0.8 V common-mode, 6×IREF output current) |
| Spread Spectrum | -0.5% down-spread or disabled - selected by logic level on SS1 pin, modulated at 30–33 kHz |
| Jitter Performance | 3.1 ps RMS (PCIe 2.0), ≤3 ps RMS (PCIe 3.0) - meets PCIe Gen3 specification for reference clock stability |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded and server motherboard applications |
Pinout & Package
Package: 16-pin TQFN (ZH16), 3 mm × 3 mm, 0.5 mm pitch, Pb-free and RoHS-compliant, thermal pad exposed on underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 10 | GND | Power ground connections - must be low-inductance, multi-point connection to PCB ground plane |
| 2 | X1 | Crystal or clock input - connects to fundamental 25 MHz crystal (CL = 18 pF typical) or external clock source |
| 3 | X2 | Crystal output - left unconnected when using external clock input; drives crystal load |
| 6 | SS1 | Spread select input - internal pull-up; logic low enables -0.5% spread, high disables spread |
| 7 | IREF | Current reference output - connects to 475 Ω precision resistor to set IREF = 2.32 mA, defining HCSL output drive strength |
| 9, 15 | VDDA / VDD | Analog and core power supplies - separate 3.3 V rails with independent decoupling required |
| 11, 12 | CLK / CLK | Differential HCSL output pair - complementary 100 MHz signals requiring external series (33 Ω) and termination (49.9 Ω to GND) per PCIe layout rules |
Key Features
| Feature | Design Value |
|---|---|
| PCIe 3.0 Compliance | Validated RMS jitter ≤3 ps at 100 MHz output, meeting PCI-SIG Gen3 reference clock specification |
| HCSL/LVDS Dual Mode | Configurable output voltage levels via external termination - supports both HCSL (33 Ω series + 49.9 Ω to GND) and LVDS (100 Ω across pair) routing |
| Spread Control Pin | SS1 pin enables hardware-selectable spread spectrum without I²C or register programming - simplifies board-level EMI tuning |
| Industrial Temp Range | Full functionality from -40°C to +85°C ambient - suitable for server backplanes and ruggedized embedded PCIe slots |
| Low-Jitter PLL Core | Proprietary analog PLL with <1 ps high-bandwidth jitter attenuation - preserves signal integrity under system noise coupling |
Applications
| PCI Express Gen3 Root Complex Timing | Embedded GPU Interface Clocking |
|---|---|
Use Scenario: Primary reference clock generation for CPU PCIe root complex on server motherboards. IC Role / Device Role / Timing Role: PCIe 3.0-compliant 100 MHz differential clock source synchronized to 25 MHz crystal, providing low-jitter timing for multiple downstream lanes. Use Value: Enables stable Gen3 link training and maintains <3 ps RMS jitter margin under thermal and supply variation. | Use Scenario: Clock distribution to discrete GPU or AI accelerator PCIe interface in edge computing platforms. IC Role / Device Role / Timing Role: Single-output HCSL clock generator driving GPU's PCIe PHY with spread spectrum enabled to reduce radiated emissions near sensitive analog subsystems. Use Value: Achieves >10 dB EMI reduction at 100 MHz fundamental without compromising PCIe link reliability. |
| Industrial PCIe Expansion Chassis | High-Density Storage Controller Timing |
Use Scenario: Timing source for hot-pluggable PCIe expansion modules in factory automation controllers. IC Role / Device Role / Timing Role: Industrial-grade clock generator operating continuously at -40°C to +85°C, delivering robust 100 MHz HCSL to FPGA-based PCIe switch fabric. Use Value: Maintains PCIe Gen3 compliance across full temperature range with no derating or external compensation. | Use Scenario: Reference clock for NVMe SSD controller PCIe interface in enterprise storage enclosures. IC Role / Device Role / Timing Role: Low-phase-noise 100 MHz clock source feeding PCIe Gen3 x4 controller, with spread bypass option for latency-critical read/write paths. Use Value: Supports deterministic sub-microsecond latency response by disabling spread during high-throughput I/O bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe 3.0 clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICS843002AGILFT | Two HCSL outputs, integrated EEPROM for spread profile storage; higher supply current (125 mA) | Supports dual-lane PCIe clocks from single device; requires I²C configuration | Select when dual-output capability or programmable spread profiles are required |
| Si53301-A-GM | LVDS-only output, 1.8 V core supply, wider input frequency range (1–710 MHz) | Requires level-shifting for 3.3 V HCSL interface; not drop-in compatible for existing PI6C557-01B layouts | Select when multi-frequency flexibility or lower-power LVDS operation is prioritized over HCSL-native drive |
Compared with ICS843002AGILFT and Si53301-A-GM, the PI6C557-01BZHIEX offers simpler hardware-controlled spread selection, native 3.3 V HCSL drive without level shifters, and minimal BOM count - making it optimal for cost-sensitive, single-lane PCIe 3.0 designs where layout reuse and EMI certification predictability are critical.
Availability
PI6C557-01BZHIEX is available at Aetrix Electronics and suitable for PCIe 3.0 root complex timing, embedded GPU interface clocking, and industrial PCIe expansion chassis requiring stable component supply and long-term lifecycle support.
Supply support for PI6C557-01BZHIEX 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
Diodes Incorporated acquired Pericom Semiconductor in 2017 and integrates its high-performance timing, interface, and signal integrity portfolio into broad mixed-signal solutions.
The PI6C557-01BZHIEX belongs to Pericom's PCIe-optimized clock generator product line, designed specifically to meet PCI-SIG Gen3 EMI and jitter specifications in space-constrained, thermally demanding motherboard and add-in card applications.
FAQ
What crystal specifications are required for stable operation?
The PI6C557-01BZHIEX requires a 25 MHz fundamental-mode parallel-resonant crystal with load capacitance of 18 pF and frequency tolerance ≤±30 ppm over -40°C to +85°C. Recommended part numbers include GC2500003 (49S/SMD), FY2500107 (5x3.2 mm), and FL2500038 (3.2x2.5 mm), all validated for low phase noise and reliable startup.
How is HCSL output termination implemented on the PCB?
HCSL termination requires two 33 Ω series resistors placed within 0.2 inches of the PI6C557-01BZHIEX CLK/CLK pins, plus two 49.9 Ω resistors connecting each output to ground. This matches the 50 Ω single-ended impedance per leg while maintaining 100 Ω differential impedance, per PCI-SIG layout guidelines for Gen3 signal integrity.
Can the device operate in LVDS mode without external components?
No - LVDS operation requires external 100 Ω differential termination across the CLK/CLK pair and 150 Ω resistors to VDD for proper common-mode biasing. The PI6C557-01BZHIEX does not integrate LVDS drivers; it relies on external passive networks to configure output voltage levels and DC bias for LVDS compliance.
What is the function of the IREF pin and how is it used?
The IREF pin sources a precision 2.32 mA reference current when a 475 Ω resistor is connected to ground. This current sets the HCSL output drive strength (IOH = 6 × IREF ≈ 13.9 mA), ensuring consistent 0.8 V common-mode voltage and controlled edge rates. No active circuitry is needed - only the specified resistor is required for calibration.
PI6C557-01BZHIEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- Ethernet, PCI Express (PCIe)
- Input:
- LVCMOS, LVTTL, Crystal
- Output:
- HCSL, LVDS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/Yes
- Frequency - Max:
- 100MHz
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TQFN (3x3)
PI6C557-01BZHIEX FAQ
1.How can I place an order for PI6C557-01BZHIEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI6C557-01BZHIEX 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 PI6C557-01BZHIEX reliable?
The price and inventory of PI6C557-01BZHIEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C557-01BZHIEX is usually 5 days.
3.What payment methods are accepted for PI6C557-01BZHIEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C557-01BZHIEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI6C557-01BZHIEX?
PI6C557-01BZHIEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI6C557-01BZHIEX 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 PI6C557-01BZHIEX?
For technical support, including PI6C557-01BZHIEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C557-01BZHIEX requirements.
6.How does Aetrix verify that PI6C557-01BZHIEX is sourced from the original manufacturer or authorized distributors?
All PI6C557-01BZHIEX 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 PI6C557-01BZHIEX meets industry standards.
7.What is the process for return or replacement of PI6C557-01BZHIEX?
All PI6C557-01BZHIEX units undergo pre-shipment inspection (PSI). If there is an issue with PI6C557-01BZHIEX, 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 PI6C557-01BZHIEX part is unused and in its original packaging.
Return procedure for PI6C557-01BZHIEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PI6C557-01BZHIEX Tags
-
LMK00334RTVRQ1
Texas Instruments
.jpg)
-
DSC557-0344FI0T
Microchip Technology
-
9FGV0241AKILFT
Renesas Electronics Corporation
-
9DBL0452CKILFT
Renesas Electronics Corporation
-
DSC557-0344FL1T
Microchip Technology
-
RC19008AGND#KB0
Renesas Electronics Corporation
-
RC19008AGND#BB0
Renesas Electronics Corporation
-
9DB403DGILFT
Renesas Electronics Corporation
-
9DB233AGILFT
Renesas Electronics Corporation
-
9DB803DGILFT
Renesas Electronics Corporation
-
9FGL0851DKILFT
Renesas Electronics Corporation
-
AB-557-03-HCHC-F-L-C-T
Abracon LLC
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
