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Diodes Incorporated PI6C557-03BLE
- Part No.:
- PI6C557-03BLE
- Manufacturer:
- Diodes Incorporated
- Category:
- Application Specific Clock/Timing
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PI6C557-03BLE.pdf
- Description:
- IC CLOCK GENERATOR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,213
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Product details
Overview
PI6C557-03BLE from Diodes Incorporated is a PCIe 3.0-compliant spread spectrum clock generator with two HCSL differential outputs, a 25 MHz crystal input, and programmable output frequencies of 25/100/125/200 MHz. It delivers 0.45 ps RMS high-frequency phase jitter (PCIe 3.0), supports -0.5%/-0.75% spread or no spread, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the PI6C557-03BLE datasheet, PI6C557-03BLE pinout, PI6C557-03BLE application, or PI6C557-03BLE equivalent, key selection criteria include PCIe 3.0 jitter compliance, HCSL current-mode drive capability (0.8 V differential pair), external spread/frequency selection via S0/S1/SS0/SS1 pins, and dual-output timing synchronization for host-to-peripheral clock distribution in embedded PC and server platforms.
Technical Context
The PI6C557-03BLE implements a proprietary Phase-Locked Loop architecture optimized for PCIe 3.0 spectral purity, using a 25 MHz fundamental-mode crystal input to synthesize four discrete output frequencies. Its PLL features independently tunable low-bandwidth (1.75–3 ps) and high-bandwidth (0.45–1 ps) jitter filtering paths per PCIe 3.0 specification requirements.
Spread spectrum modulation is implemented digitally via external SS0/SS1 control pins, enabling selection among three modes: no spread, -0.5% down-spread, or -0.75% down-spread at 30–33 kHz modulation frequency. Output enable (OE) provides synchronous tri-state control of both HCSL output pairs with ≤10 μs enable/disable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | HCSL differential pair (0.8 V swing, 3.0 kΩ output resistance) |
| Input Frequency | 25 MHz crystal or single-ended clock - fixed reference for all synthesized outputs |
| Output Frequencies | 25 MHz, 100 MHz, 125 MHz, or 200 MHz - selected by S0/S1 pins per Table 1 |
| PCIe 3.0 Jitter | 0.45 ps RMS (high-frequency band) - meets PCI-SIG Gen3 compliance threshold |
| Supply Voltage | 3.3 V ±10% - powers analog PLL core (VDDA), digital logic (VDDX), and crystal buffer (VDDX) |
| Operating Temp | -40°C to +85°C - validated for industrial-grade motherboard and add-in card environments |
| Spread Options | -0.5%, -0.75%, or no spread - selected via SS0/SS1 pins; 30–33 kHz modulation frequency |
Pinout & Package
PI6C557-03BLE is housed in a 16-pin TSSOP (173 mil wide, JEDEC MO-153), with separate power domains for analog (VDDA/GNDA), digital (VDDX/GNDX), and crystal (X1/CLK, X2, GNDX) sections to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (S0, S1) | Frequency select inputs | Binary-coded selection of 25/100/125/200 MHz output; internal pull-up enables default 25 MHz on power-up |
| 3, 8 (SS0, SS1) | Spread select inputs | Two-bit encoding for no spread, -0.5%, or -0.75% down-spread; internal pull-up ensures no-spread default |
| 4 (X1/CLK) | Clock input | Accepts 25 MHz crystal (parallel resonant) or single-ended clock signal; drives internal PLL reference path |
| 6 (OE) | Output enable | Active-low control: pulls both CLK0/CLK1 differential pairs into high-impedance state within 10 μs |
| 9 (IREF) | Current reference output | Sinks 2.32 mA when 475 Ω resistor connected; sets HCSL output current (IOH = 6 × IREF = ~13.9 mA) |
| 10, 11, 14, 15 (CLK1, CLK1, CLK0, CLK0) | HCSL differential outputs | Complementary current-mode outputs requiring external 33 Ω series + 49.9 Ω termination to ground per PCIe layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| PCIe 3.0–compliant jitter performance | 0.45 ps RMS high-frequency phase jitter - enables direct integration into Gen3 root complex and endpoint designs without additional jitter cleanup |
| HCSL output drive strength | Configurable 13.9 mA output current (via IREF + 475 Ω) - matches standard PCIe slot HCSL receiver input impedance (50 Ω differential) |
| External frequency/spread configuration | No firmware or I²C required - all settings controlled by hardwired Sx/SSx pins, simplifying board-level bring-up and reducing BOM count |
| Dual independent power domains | VDDA/GNDA (analog PLL) and VDDX/GNDX (digital logic/crystal buffer) - suppresses digital switching noise from degrading PLL phase noise |
| Industrial temperature operation | -40°C to +85°C ambient rating - qualified for use in fanless embedded systems, network appliances, and industrial PCs without derating |
Applications
| PCIe 3.0 Root Complex Clocking | Embedded Server Baseboard Management |
|---|---|
Use Scenario: Providing synchronized 100 MHz HCSL clocks to multiple PCIe 3.0 slots and onboard peripherals on a server motherboard. IC Role / Device Role / Timing Role: Primary clock generator sourcing reference timing for CPU PCIe controller, M.2 NVMe controllers, and PCIe switch fabric. Use Value: Meets PCIe 3.0 0.45 ps RMS jitter spec at 100 MHz output, eliminating need for external jitter attenuators and reducing layer count in high-speed routing. |
Use Scenario: Delivering stable 25 MHz and 125 MHz clocks to BMC (Baseboard Management Controller), IPMI interface, and system watchdog circuitry in rack-mounted servers. IC Role / Device Role / Timing Role: Dual-frequency timing source supporting both low-power management functions (25 MHz) and high-speed out-of-band communication (125 MHz). Use Value: Single-device solution replaces discrete crystal oscillators and dividers, reducing footprint by 42% and improving thermal stability across -40°C to +85°C operating range. |
| Industrial PCIe Add-in Card Timing | Network Appliance Synchronization |
Use Scenario: Generating 200 MHz HCSL clocks for FPGA-based PCIe endpoint cards used in real-time data acquisition systems. IC Role / Device Role / Timing Role: Low-jitter clock synthesizer feeding FPGA transceivers and PCIe PHY layers in deterministic latency applications. Use Value: 35 ps cycle-to-cycle jitter and <50 ps inter-output skew ensure reliable 8 GT/s link training and stable link width negotiation under EMI stress. |
Use Scenario: Supplying spread-spectrum 100 MHz clocks to multi-port Ethernet switch ASICs and PHYs in 1U network appliances. IC Role / Device Role / Timing Role: EMI-reduction clock source enabling FCC Class B compliance without metal shielding or ferrite beads. Use Value: Configurable -0.75% down-spread mode reduces peak radiated emissions by >10 dB at 100 MHz harmonics, passing conducted EMI tests on first spin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe clock generation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT8T49N242B | LVDS/HCSL dual-output, 3.3 V, but requires I²C configuration; higher 0.55 ps RMS jitter at 100 MHz | Supports programmable slew rate and output amplitude; better suited for mixed-signal SoC interfaces than pure PCIe slot timing | Select when dynamic reconfiguration or multi-protocol support (SATA, USB3) is required beyond PCIe 3.0 |
| ICS843002AG-01 | 2-output PCIe 3.0 generator with identical 0.45 ps RMS jitter, but only supports 100/125 MHz outputs (no 25/200 MHz) | Lacks spread spectrum control pins - fixed -0.25% spread; no OE pin for output gating | Select when only 100/125 MHz PCIe timing is needed and board space allows larger 24-pin QFN package |
Compared with IDT8T49N242B and ICS843002AG-01, the PI6C557-03BLE offers broader frequency coverage (25–200 MHz), hardware-only configuration (no I²C), and dedicated OE control - making it optimal for cost-sensitive, high-volume PCIe 3.0 motherboard and add-in card designs where simplicity and jitter margin are critical.
Availability
PI6C557-03BLE is available at Aetrix Electronics and suitable for PCIe 3.0 motherboard design, industrial embedded server development, and network appliance timing applications requiring stable component supply and long-term lifecycle assurance.
Supply support for PI6C557-03BLE 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, analog ICs, and timing solutions, with design centers in Asia, Europe, and North America and ISO/TS 16949-certified manufacturing facilities.
The PI6C557-03BLE belongs to Diodes' PCIe-optimized clock generator product line, engineered specifically for EMI reduction and jitter-critical applications in computing, storage, and networking infrastructure.
FAQ
What crystal specifications are required for stable PI6C557-03BLE operation?
The PI6C557-03BLE 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, 4.0 mm) and FL2500047 (3.2×2.5 mm SMD). Crystal capacitors must be set to (CL − 8) × 2 = 16 pF for CL = 18 pF.
How is HCSL output current configured on the PI6C557-03BLE?
HCSL output current is set by connecting a precision 475 Ω resistor between IREF (Pin 9) and ground, establishing a 2.32 mA reference current. The device scales this to 6 × IREF = 13.9 mA per output leg, delivering the standard 0.8 V differential swing across 50 Ω termination. No external current-setting resistors are needed on CLK0/CLK1 lines.
Can the PI6C557-03BLE be used in LVDS mode?
Yes - the PI6C557-03BLE supports LVDS-compatible voltage levels via external termination: 100 Ω across differential pair (RP/RQ), plus 150 Ω to ground (RT) per LVDS layout guidelines. Output swing adjusts to ~350 mV differential, meeting LVDS electrical standards while retaining the same 25–200 MHz frequency options and spread control.
What is the power sequencing requirement for PI6C557-03BLE?
No strict power sequencing is required: VDDA, VDDX, and GNDA/GNDX may be powered simultaneously. Decoupling capacitors (0.01 μF ceramic) must be placed within 2 mm of each VDD pin. Total supply current is 95 mA typical at 3.3 V; OE = LOW reduces current to 50 mA by disabling outputs.
PI6C557-03BLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-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:
- 1:2
- Differential - Input:Output:
- No/Yes
- Frequency - Max:
- 200MHz
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
PI6C557-03BLE FAQ
1.How can I place an order for PI6C557-03BLE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI6C557-03BLE 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 PI6C557-03BLE reliable?
The price and inventory of PI6C557-03BLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C557-03BLE is usually 5 days.
3.What payment methods are accepted for PI6C557-03BLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C557-03BLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI6C557-03BLE?
PI6C557-03BLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI6C557-03BLE 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 PI6C557-03BLE?
For technical support, including PI6C557-03BLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C557-03BLE requirements.
6.How does Aetrix verify that PI6C557-03BLE is sourced from the original manufacturer or authorized distributors?
All PI6C557-03BLE 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 PI6C557-03BLE meets industry standards.
7.What is the process for return or replacement of PI6C557-03BLE?
All PI6C557-03BLE units undergo pre-shipment inspection (PSI). If there is an issue with PI6C557-03BLE, 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 PI6C557-03BLE part is unused and in its original packaging.
Return procedure for PI6C557-03BLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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