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Diodes Incorporated PI6C557-05BLE
- Part No.:
- PI6C557-05BLE
- Manufacturer:
- Diodes Incorporated
- Category:
- Application Specific Clock/Timing
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PI6C557-05BLE.pdf
- Description:
- IC CLOCK GENERATOR 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,124
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Product details
Overview
PI6C557-05BLE from Diodes Incorporated is a PCIe® 3.0-compliant spread spectrum clock generator with four HCSL differential outputs, designed for EMI reduction in PC and embedded systems. It accepts a 25MHz crystal input, generates 100MHz/200MHz differential clocks, supports -0.5%/-1.0%/-1.5% down-spread or no spread, and operates across -40°C to +85°C.
For engineers reviewing the PI6C557-05BLE datasheet, PI6C557-05BLE pinout, PI6C557-05BLE application, or PI6C557-05BLE equivalent, key selection criteria include PCIe 3.0 phase jitter (0.48ps RMS), HCSL output compliance (0.7V current-mode differential pair), spread selection via S[2:0] pins, and TSSOP-20 package compatibility with industrial temperature operation.
Technical Context
The PI6C557-05BLE uses a proprietary PLL architecture to synthesize 100MHz or 200MHz differential clock outputs from a 25MHz fundamental-mode crystal. Its spread spectrum modulation operates at 30–33kHz with selectable down-spread percentages, directly controlled by three logic-level pins (S0–S2).
All four output pairs (CLK0–CLK3) are HCSL-compatible with 0.7V common-mode voltage and 6×IREF output drive strength (IREF = 2.32mA typical). Output enable (OE) and power-down (PD) pins provide active-high control with internal pull-up resistors, enabling system-level power management and dynamic clock gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PCIe 3.0 Phase Jitter | 0.48ps RMS (high-frequency band); meets PCI-SIG jitter compliance for Gen3 link stability |
| Output Frequency Options | 100MHz or 200MHz selectable via S[2:0]; supports both PCIe reference clock and high-speed serial interface timing |
| Spread Spectrum Range | -0.5%, -1.0%, -1.5%, or no spread; reduces EMI peak amplitude without affecting data eye integrity |
| HCSL Output Drive | 0.7V current-mode differential pair; matches PCIe 3.0 HCSL receiver input thresholds and termination requirements |
| Supply Voltage | 3.3V ±5% (VDDXD and VDDODA); requires separate digital/analog rail decoupling per datasheet layout guidelines |
| Cycle-to-Cycle Jitter | 40ps (typical); ensures low timing uncertainty for synchronous logic sampling across multiple clock domains |
| Operating Temperature | -40°C to +85°C ambient; validated for industrial-grade embedded and computing platforms |
Pinout & Package
Package: 20-pin TSSOP (173mil wide, Pb-free & RoHS-compliant), thermal resistance θJA = 93°C/W (still air).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDXD (Pin 1) | Digital power supply | +3.3V digital core rail; requires local 0.01μF/0.1μF decoupling to minimize switching noise coupling |
| S0–S2 (Pins 2–4) | Spread/frequency select inputs | Three-bit binary code selects spread percentage (-0.5% to -1.5%) and output frequency (100/200MHz) |
| X1/X2 (Pins 5–6) | Crystal oscillator interface | Connects to 25MHz parallel-resonant crystal (≤30ppm tolerance); internal driver enables direct crystal drive |
| PD (Pin 7) | Power-down control | Active-low; places device in low-current standby mode (<100µA IDD) while preserving configuration state |
| OE (Pin 8) | Output enable | Active-high; tri-states all CLKx outputs when low, enabling shared bus or hot-plug clock management |
| IREF (Pin 10) | Current reference output | Provides 2.32mA reference current; sets HCSL output drive strength (IOH = 6×IREF = ~13.9mA) |
| CLK0–CLK3 (Pins 11–20) | Differential clock outputs | Four true/complement HCSL pairs; each pair requires external series resistor (33Ω) and ground termination (49.9Ω) |
Key Features
| Feature | Design Value |
|---|---|
| PCIe 3.0-compliant jitter performance | 0.48ps RMS phase jitter (high-frequency band) ensures Gen3 link training success and BER <10⁻¹² |
| Configurable spread spectrum | Four discrete spread options (-0.5% to -1.5%) selected via hardware pins-no firmware or I²C required |
| HCSL/LVDS dual-mode compatibility | Same output structure supports both HCSL (PCIe) and LVDS (Ethernet, SATA) signaling with layout-adjusted termination |
| Industrial temperature operation | Validated from -40°C to +85°C ambient; suitable for fanless embedded controllers and server backplanes |
| Low-power enable/disable control | OE and PD pins support sub-10µs output disable and <100µA standby current for dynamic power management |
Applications
| PCI Express 3.0 Root Complex | Server Backplane Clock Distribution |
|---|---|
|
Use Scenario: Provides reference clock to CPU PCIe root complex and multiple downstream slots in x16/x8/x4 configurations. IC Role / Device Role / Timing Role: Primary PCIe 3.0 reference clock generator with spread spectrum enabled to meet FCC Class B radiated emissions limits. Use Value: Eliminates need for external EMI filters or shielding on motherboard; maintains 100MHz/200MHz clock integrity across 12+ inch trace lengths. |
Use Scenario: Distributes synchronized clocks to multiple PCIe switch ICs, NICs, and storage controllers on high-density server backplanes. IC Role / Device Role / Timing Role: Low-skew (50ps max) 4-output clock source with independent spread control per channel group. Use Value: Enables simultaneous clocking of heterogeneous devices while maintaining PCIe Gen3 timing margin under thermal stress. |
| Embedded Computing Platform | Industrial Ethernet Switch |
|
Use Scenario: Supplies clock to SoC PCIe interface, USB 3.0 PHY, and SATA controller in fanless edge gateway designs. IC Role / Device Role / Timing Role: Single-chip clock solution replacing multiple oscillators; supports 100MHz (SATA/USB) and 200MHz (PCIe) simultaneously. Use Value: Reduces BOM count by 3× vs discrete oscillators; maintains -40°C to +85°C operation without derating. |
Use Scenario: Generates 125MHz Ethernet reference clock (via 200MHz ÷ 1.6) and auxiliary clocks for PHYs and packet processors. IC Role / Device Role / Timing Role: Configured as LVDS-compatible clock source meeting IEEE 802.3 clause 40 jitter requirements. Use Value: Achieves <0.5ps RMS jitter at 125MHz after division; eliminates need for dedicated Ethernet clock IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread spectrum clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT8T49N242B | 8-output, I²C-programmable; higher integration but requires firmware initialization and external EEPROM | Supports multi-protocol (PCIe, SATA, USB) with programmable output formats; not pin-compatible | Choose for flexible multi-protocol systems requiring dynamic reconfiguration; avoid if hardware-only setup is required |
| ICS843002AGI | 4-output, fixed 100MHz only; no spread spectrum; lower jitter (0.35ps RMS) but no EMI reduction capability | Used where ultra-low jitter is prioritized over EMI compliance (e.g., test equipment, FPGA prototyping) | Choose when PCIe link stability is critical and board-level EMI filtering is already implemented |
Compared with IDT8T49N242B and ICS843002AGI, the PI6C557-05BLE delivers hardware-configurable spread spectrum in a simple TSSOP package-ideal for cost-sensitive, firmware-light PCIe 3.0 designs needing guaranteed EMI reduction without software overhead.
Availability
PI6C557-05BLE is available at Aetrix Electronics and suitable for PCIe 3.0 root complexes, server backplane clock distribution, and industrial embedded computing platforms requiring stable component supply, full RoHS compliance, and industrial temperature operation.
Supply support for PI6C557-05BLE 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 is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and timing solutions for computing, industrial, and communications markets.
The PI6C557-05BLE belongs to Diodes' Pericom-branded timing product line, engineered specifically for EMI-reduction in high-speed serial interfaces including PCIe, SATA, and Ethernet.
FAQ
What crystal specifications are required for reliable PI6C557-05BLE operation?
The PI6C557-05BLE requires a 25MHz fundamental-mode parallel-resonant crystal with ≤30ppm frequency tolerance over -40°C to +85°C, load capacitance of 18pF, and ESR ≤60Ω. Recommended part numbers include GC2500003 (49S/SMD) and FL2500047 (3.2×2.5mm SMD). Crystal layout must follow tight trace-length matching and ground isolation per DS43156 Section 3.
How does the IREF pin affect HCSL output drive strength?
The IREF pin sources a precision 2.32mA current (with 475Ω external resistor), which sets the internal current mirror gain. Each HCSL output delivers IOH = 6×IREF ≈ 13.9mA into a 50Ω load, producing the specified 0.7V common-mode voltage and differential swing. Deviation from 475Ω alters output amplitude and may violate PCIe HCSL voltage thresholds.
Can the PI6C557-05BLE be used in LVDS mode without hardware modification?
Yes-the same output structure supports LVDS signaling by changing external termination: replace 33Ω series + 49.9Ω ground resistors with 100Ω differential termination and 150Ω Thevenin bias. No internal register changes or pin reconfiguration are needed; only PCB layout adjustment is required per DS43156 Section 5.
What is the maximum allowable skew between CLK0 and CLK3 outputs?
The datasheet specifies 50ps maximum inter-output skew measured at the crossing point voltage (300mV nominal) under identical load and temperature conditions. This value holds across the full -40°C to +85°C range and is verified with 50Ω terminations and matched PCB trace lengths per PCIe layout guidelines in DS43156 Section 4.
PI6C557-05BLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- Ethernet, PCI Express (PCIe)
- Input:
- HCSL, Crystal
- Output:
- HCSL, LVDS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:4
- Differential - Input:Output:
- No/Yes
- Frequency - Max:
- 200MHz
- Voltage - Supply:
- 3.135V ~ 3.465V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-TSSOP
PI6C557-05BLE FAQ
1.How can I place an order for PI6C557-05BLE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI6C557-05BLE 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 PI6C557-05BLE reliable?
The price and inventory of PI6C557-05BLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C557-05BLE is usually 5 days.
3.What payment methods are accepted for PI6C557-05BLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C557-05BLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI6C557-05BLE?
PI6C557-05BLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI6C557-05BLE 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 PI6C557-05BLE?
For technical support, including PI6C557-05BLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C557-05BLE requirements.
6.How does Aetrix verify that PI6C557-05BLE is sourced from the original manufacturer or authorized distributors?
All PI6C557-05BLE 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 PI6C557-05BLE meets industry standards.
7.What is the process for return or replacement of PI6C557-05BLE?
All PI6C557-05BLE units undergo pre-shipment inspection (PSI). If there is an issue with PI6C557-05BLE, 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 PI6C557-05BLE part is unused and in its original packaging.
Return procedure for PI6C557-05BLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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