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Diodes Incorporated PI6C557-03AQLEX
- Part No.:
- PI6C557-03AQLEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Application Specific Clock/Timing
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PI6C557-03AQLEX.pdf
- Description:
- IC CLOCK GENERATOR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
PI6C557-03AQ from Diodes Incorporated is an AEC-Q100 qualified, automotive-grade spread spectrum clock generator compliant with PCI Express® 2.0 and Ethernet timing requirements. It accepts a 25MHz crystal or single-ended clock input and delivers two pairs of HCSL differential outputs at 25/100/125/200MHz with selectable spread (-0.5%, -0.75%, or none), reducing EMI in high-speed digital systems such as automotive infotainment and ADAS domain controllers.
For engineers reviewing the PI6C557-03AQ datasheet, PI6C557-03AQ pinout, PI6C557-03AQ application, or PI6C557-03AQ equivalent, key selection criteria include PCIe 2.0 RMS jitter (3.1ps typ), HCSL output drive capability (0.8V current-mode), spread-spectrum configuration via external pins (SS1:SS0, S1:S0), and AEC-Q100 qualification for under-hood deployment.
Technical Context
The PI6C557-03AQ implements a proprietary Phase-Locked Loop architecture optimized for low-jitter clock synthesis from a 25MHz fundamental crystal. Its dual-output structure supports independent frequency selection (via S1:S0) and spread control (via SS1:SS0), enabling simultaneous generation of distinct PCIe-compliant clocks on CLK0 and CLK1 pairs.
All outputs are current-mode HCSL drivers with 0.8V common-mode voltage and require external termination (e.g., 33Ω series + 49.9Ω to ground per PCI Express Layout Guidelines). The device integrates internal pull-up resistors on all control pins (S0, S1, SS0, SS1, OE) and uses separate analog (VDDA/GNDA) and crystal (VDDX/GNDX) power domains to isolate noise-sensitive PLL circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Dual HCSL differential pairs (CLK0/CLK0̅, CLK1/CLK1̅); LVDS-compatible with layout adjustment |
| Input Frequency | 25MHz crystal or single-ended clock; requires parallel-resonant crystal with ≤300ppm tolerance |
| Output Frequencies | 25MHz, 100MHz, 125MHz, or 200MHz - selected by S1:S0 logic pins per Table 1 |
| Spread Spectrum | Selectable down-spread: -0.5% (SS1=0,SS0=1), -0.75% (SS1=1,SS0=0), or no spread (SS1=SS0=0 or 1) |
| Jitter Performance | 3.1ps RMS phase jitter (PCIe 2.0 test method @100MHz); 35ps cycle-to-cycle (typ) |
| Supply & Temp Range | 3.3V ±10% supply; operates from -40°C to +85°C ambient; AEC-Q100 Grade 2 qualified |
| Package | 16-pin TSSOP (L), 173mil wide; Pb-free, RoHS 3 and halogen/antimony-free "Green" construction |
Pinout & Package
Package: 16-pin TSSOP (L), 173mil body width, 0.65mm pitch, exposed pad not present. Designed for automotive PCB layouts requiring IATF 16949 process control and PPAP documentation support.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (S0, S1) | Frequency select inputs | Binary-coded selection of output frequency (25/100/125/200MHz); internal pull-up enables default 25MHz on power-up |
| 3, 8 (SS0, SS1) | Spread select inputs | Two-bit encoding for spread mode (-0.5%, -0.75%, or no spread); internal pull-up ensures no-spread default |
| 4 (X1/CLK), 5 (X2) | Crystal/clock interface | X1/CLK accepts 25MHz crystal or clock; X2 is crystal output - leave open for external clock mode |
| 6 (OE) | Output enable | Active-low tri-state control for both HCSL output pairs; internal pull-up holds outputs enabled at power-up |
| 9 (IREF) | Current reference output | Connects to 475Ω resistor to set 2.32mA reference; output drive current = 6×IREF = ~13.9mA per HCSL leg |
| 10, 11, 14, 15 (CLK1, CLK1̅, CLK0, CLK0̅) | HCSL differential outputs | Current-mode outputs requiring external series (33Ω) and termination (49.9Ω to GND) per PCIe layout rules |
| 12, 16 (VDDA, VDDX) | Analog & crystal supply | VDDA powers analog/PLL core; VDDX powers crystal oscillator - both require local 0.01μF decoupling |
| 7 (GNDX), 13 (GNDA) | Crystal & analog ground | Separate ground returns minimize coupling between crystal oscillator noise and PLL analog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Validated for automotive operation from -40°C to +105°C junction temperature; manufactured in IATF 16949-certified facilities with PPAP support |
| Configurable spread spectrum | Hardware-selectable -0.5% or -0.75% down-spread via SS1:SS0 pins - reduces peak EMI without software or register programming |
| HCSL output compliance | Meets PCIe 2.0 electrical specs: 0.8V common-mode, 35ps cycle-to-cycle jitter, 50ps inter-pair skew at crossing point |
| Dual independent output pairs | CLK0 and CLK1 operate at same or different frequencies (25–200MHz) and spread settings - supports multi-domain clocking in SoC-based ECUs |
| Low-noise PLL architecture | 2.1ps RMS phase jitter (typ) at 100MHz; θJA = 90°C/W enables stable operation in compact automotive modules without forced air |
Applications
| Automotive Infotainment Head Unit | ADAS Domain Controller |
|---|---|
|
Use Scenario: Clocking multiple high-speed interfaces (PCIe Gen2, SATA, USB 3.0) in a centralized infotainment ECU with strict EMI limits for FM band immunity. IC Role / Device Role / Timing Role: Primary spread-spectrum clock generator providing synchronized 100MHz and 200MHz HCSL clocks to SoC and peripheral controllers. Use Value: -0.75% spread setting reduces 100MHz harmonic peaks by >10dB, enabling pass-fail compliance in CISPR 25 Class 5 radiated emissions testing. |
Use Scenario: Timing synchronization across camera sensor interfaces (MIPI CSI-2), radar processing units (PCIe-connected FPGA), and display pipelines in a zonal architecture. IC Role / Device Role / Timing Role: Dual-output clock source delivering 125MHz (for MIPI PHY) and 200MHz (for PCIe switch) with matched skew & jitter. Use Value: 50ps max inter-pair skew and 3.1ps RMS jitter ensure deterministic data capture across multi-Gbps serial links under thermal stress (-40°C to +85°C). |
| Automotive Telematics Control Unit (TCU) | Body Control Module (BCM) with High-Speed Networking |
|
Use Scenario: Providing low-jitter reference clocks to LTE/5G modems and Ethernet AVB switches in a thermally constrained TCU housing near engine bay. IC Role / Device Role / Timing Role: AEC-Q100 qualified clock generator accepting 25MHz TCXO input and producing 25MHz (modem) and 125MHz (Ethernet MAC) outputs. Use Value: Separate VDDX/GNDX and VDDA/GNDA rails suppress crystal oscillator noise coupling into sensitive RF receive paths. |
Use Scenario: Replacing multiple discrete oscillators in next-gen BCMs integrating Gigabit Ethernet, CAN FD, and LIN with centralized clock distribution. IC Role / Device Role / Timing Role: Single-chip solution generating 25MHz (CAN FD controller), 100MHz (Ethernet PHY), and spread-enabled 125MHz (switch fabric) clocks. Use Value: Eliminates board space and BOM cost of three separate oscillators while maintaining <±50ppm total stability over lifetime via AEC-Q100 reliability validation. |
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 |
|---|---|---|---|
| ICS8430I-01T | Single-output LVDS clock generator; no HCSL support; fixed -0.5% spread only; no AEC-Q100 qualification | Limited to non-automotive industrial PCIe endpoints; lacks dual-output flexibility and automotive reliability validation | Choose only for cost-sensitive non-automotive designs where single 100MHz LVDS output suffices and EMI margin is ample. |
| Si5332A-D-GM | Programmable multi-output clock generator; supports I²C configuration; higher integration but larger 32-QFN package | Requires firmware initialization; suited for complex timing trees with >2 outputs or fractional synthesis needs | Select when system demands dynamic frequency reconfiguration, multiple output formats (LVDS/HCSL/LVPECL), or sub-1ps jitter performance. |
Compared with ICS8430I-01T and Si5332A-D-GM, the PI6C557-03AQ uniquely balances automotive qualification, hardware-configurable spread, dual HCSL outputs, and TSSOP footprint - making it optimal for cost- and space-constrained PCIe 2.0 clocking in production automotive ECUs without software overhead.
Availability
PI6C557-03AQ is available at Aetrix Electronics and suitable for automotive infotainment head units, ADAS domain controllers, and telematics control units requiring stable component supply with full AEC-Q100 traceability and PPAP documentation.
Supply support for PI6C557-03AQ 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 automotive, industrial, and computing markets.
The PI6C557-03AQ belongs to Diodes' Pericom-branded automotive timing portfolio, designed specifically to meet stringent EMI reduction and reliability requirements in safety-critical vehicle subsystems.
FAQ
What crystal specifications are required for reliable operation?
The PI6C557-03AQ requires a 25MHz fundamental-mode parallel-resonant crystal with ≤300ppm frequency tolerance over temperature. Diodes recommends FL2500184Q (20pF load capacitance, ±15ppm tolerance) with external 27pF capacitors (C1/C2) and optional 360Ω series resistor for drive-level control. Crystal ESR must be ≤80Ω.
How is HCSL output termination implemented per PCIe 2.0 standards?
HCSL outputs require 33Ω series resistors on each CLK/CLK̅ line near the driver, plus 49.9Ω resistors to ground at the receiver end. This forms a 50Ω single-ended impedance path matching PCIe 2.0 differential routing guidelines. Layout must maintain tight coupling (100Ω differential) for L4 segments ≥2 inches.
Can the PI6C557-03AQ be used in LVDS mode?
Yes - the device supports LVDS-compatible voltage levels when configured with 100Ω differential termination and 150Ω termination to VDD/2. External RP/RQ=100Ω and RT=150Ω resistors are required per Diodes' LVDS Layout Guidelines. Output swing adjusts to ~350mV differential with this configuration.
What is the function of the IREF pin and how is it used?
IREF outputs a precision 2.32mA reference current when a 475Ω resistor is connected to ground. This sets the HCSL output current to 6×IREF = ~13.9mA per leg, ensuring correct 0.8V common-mode voltage and 50Ω output impedance. No active circuitry connects to IREF - it is strictly a current-source output.
PI6C557-03AQLEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- PLL:
- Yes
- Main Purpose:
- Ethernet, PCI Express (PCIe)
- Input:
- Clock, 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:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 16-TSSOP
PI6C557-03AQLEX FAQ
1.How can I place an order for PI6C557-03AQLEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI6C557-03AQLEX 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 PI6C557-03AQLEX reliable?
The price and inventory of PI6C557-03AQLEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C557-03AQLEX is usually 5 days.
3.What payment methods are accepted for PI6C557-03AQLEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C557-03AQLEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI6C557-03AQLEX?
PI6C557-03AQLEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI6C557-03AQLEX 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 PI6C557-03AQLEX?
For technical support, including PI6C557-03AQLEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C557-03AQLEX requirements.
6.How does Aetrix verify that PI6C557-03AQLEX is sourced from the original manufacturer or authorized distributors?
All PI6C557-03AQLEX 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 PI6C557-03AQLEX meets industry standards.
7.What is the process for return or replacement of PI6C557-03AQLEX?
All PI6C557-03AQLEX units undergo pre-shipment inspection (PSI). If there is an issue with PI6C557-03AQLEX, 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 PI6C557-03AQLEX part is unused and in its original packaging.
Return procedure for PI6C557-03AQLEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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