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Diodes Incorporated PI6C4931502-04LIEX
- Part No.:
- PI6C4931502-04LIEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Clock Buffers, Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PI6C4931502-04LIEX.pdf
- Description:
- IC CLK BUFFER 2:2 250MHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:725
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Product details
Overview
PI6C4931502-04LIEX from Diodes Incorporated is a high-performance 2-output HCSL fanout buffer with dual selectable clock inputs (differential CLK0/nCLK0 or single-ended CLK1), 250MHz max output frequency, <0.1ps typical additive phase jitter, and 1.5ns typical propagation delay. It operates from 2.5V or 3.3V supply and supports industrial temperature range (–40°C to +85°C) in networking switch clock distribution.
For engineers reviewing the PI6C4931502-04LIEX datasheet, PI6C4931502-04LIEX pinout, PI6C4931502-04LIEX application, or PI6C4931502-04LIEX equivalent, key selection criteria include HCSL output compliance, input source select logic (CLK_SEL), output enable control (CLK_EN), IREF current-setting terminal, and TSSOP-16 thermal/power delivery constraints.
Technical Context
This device implements a low-skew, low-jitter fanout architecture with independent input selection (CLK_SEL) and global output enable (CLK_EN). Its differential HCSL outputs (Q0/nQ0, Q1/nQ1) are individually terminated via internal current sources calibrated by external IREF resistor (typically 475Ω).
The buffer accepts either LVDS-like differential inputs (CLK0/nCLK0) or LVCMOS single-ended input (CLK1), with programmable pull-up/pull-down on all control and input pins. Propagation delay is tightly controlled at 1.5ns typ., and part-to-part skew is guaranteed ≤600ps under matched load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | HCSL (High-Speed Current Steering Logic) - compatible with PCIe Gen3/Gen4 reference clock receivers requiring 17mA drive and 50Ω termination. |
| Max Output Frequency | 250 MHz - supports backplane clocking for 10G Ethernet PHYs and multi-lane SerDes interfaces. |
| Additive Phase Jitter | <0.1 ps RMS (typ) - enables use in jitter-sensitive timing paths without additional cleanup PLLs. |
| Propagation Delay | 1.5 ns (typ) - ensures deterministic timing alignment across fanout branches in synchronous systems. |
| Supply Voltage | 2.5V or 3.3V - dual-rail support simplifies integration into mixed-voltage board designs. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade networking and telecom infrastructure deployment. |
| Input Selection | Dual-source: differential (CLK0/nCLK0) or single-ended (CLK1) - enables flexible clock tree redundancy or source switching. |
Pinout & Package
Package: 16-pin TSSOP (173-mil width), lead-free and RoHS-compliant (suffix 'E'), tape-and-reel packaging (suffix 'X').
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLK_EN | Active-high output enable | Drives all HCSL outputs LOW/HIGH when deasserted; enables deterministic power-down state control. |
| 2 CLK_SEL | Input source select | Logic 0 selects differential CLK0/nCLK0; logic 1 selects single-ended CLK1 - no external logic required. |
| 3,4 CLK0 / nCLK0 | Differential clock input | LVDS-compatible input pair with internal 100Ω termination; supports AC-coupled or DC-coupled clock injection. |
| 5 CLK1 | Single-ended clock input | LVCMOS input with programmable pull-down; accepts 2.5V/3.3V logic levels directly from FPGA or MCU clocks. |
| 8 IREF | Output current calibration | Connects external 475Ω resistor to set nominal 17mA HCSL output current per channel. |
| 9,10,15 VDD | Power supply | Three dedicated VDD pins minimize supply noise coupling between input, logic, and output stages. |
| 11,12 Q1 / nQ1 | HCSL output pair | Matched complementary outputs with 50Ω source impedance - requires external 50Ω termination to VDD-0.8V. |
| 13,14 Q0 / nQ0 | HCSL output pair | Independent second HCSL output bank with identical electrical specs and skew matching to Q1/nQ1. |
| 16 GND | Ground reference | Single ground pin shared across all functional blocks; layout requires low-inductance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input clock selection | Hardware-selectable between differential and single-ended sources eliminates need for external multiplexers or level shifters. |
| Ultra-low additive jitter | <0.1ps RMS enables direct use in PCIe Gen4/5 reference clock trees without jitter attenuation circuitry. |
| Programmable output current | IREF pin allows precise HCSL current tuning (±5%) via single external resistor - ensures signal integrity across PVT variations. |
| Low propagation delay variation | 1.5ns typ. TPD with ≤100ps output skew (TODC) maintains tight timing margins in high-speed parallel clock distribution. |
| Industrial temperature operation | Validated performance from –40°C to +85°C supports deployment in uncontrolled telecom cabinets and edge compute platforms. |
Applications
| 10G Ethernet Switch Clock Distribution | PCIe Gen4 Reference Clock Fanout |
|---|---|
Use Scenario: Distributing a single 100MHz or 156.25MHz reference clock to multiple PHY lanes and MAC controllers in Layer 2/L3 switches. IC Role / Device Role / Timing Role: Low-jitter fanout buffer providing two independent HCSL copies with matched delay and skew. Use Value: Eliminates inter-lane timing misalignment that causes link training failures or reduced BER in multi-port 10GBase-KR interfaces. | Use Scenario: Replicating a 100MHz PCIe reference clock to four slots or multiple root complex endpoints in server motherboards. IC Role / Device Role / Timing Role: Dual-HCSL buffer enabling simultaneous clocking of two PCIe Gen4 x4 links with sub-0.1ps additive jitter. Use Value: Meets PCIe Gen4 specification for reference clock jitter (≤1.0ps RMS total) without requiring additional jitter cleaners. |
| Backplane-Based Telecom Timing | FPGA-Based High-Speed Data Acquisition |
Use Scenario: Delivering synchronized clocks across distributed line cards in carrier-grade packet optical transport systems. IC Role / Device Role / Timing Role: Industrial-temperature fanout buffer with dual input selection for redundant clock source failover. Use Value: Supports hot-swappable card insertion while maintaining <0.1ps jitter and deterministic CLK_EN-controlled mute behavior. | Use Scenario: Providing time-aligned sampling clocks to multiple ADCs and DACs in radar or test equipment with FPGA-based timing control. IC Role / Device Role / Timing Role: Low-delay, low-skew buffer synchronizing analog front-end clocks to FPGA-generated trigger signals. Use Value: Enables coherent multi-channel sampling with <100ps inter-channel skew, critical for beamforming and phase-coherent processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HCSL fanout buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT8T49N286A | 4-output, integrated PLL with programmable output formats (HCSL/LVDS/LVPECL); higher power (120mA), larger QFN32 package. | Used where clock synthesis + fanout is needed in one device; not drop-in for pure fanout-only designs. | Select when system requires jitter cleaning or frequency translation - avoid if only low-cost, low-power fanout is required. |
| Si53301-D-GM | 2-output, no internal PLL, but supports 1.8V/2.5V/3.3V supplies; lower jitter (0.07ps typ), same TSSOP-16 footprint. | Compatible pinout and function; differs in IREF implementation (internal vs external) and input voltage thresholds. | Drop-in replacement if board layout accommodates different IREF configuration and input biasing. |
Compared with IDT8T49N286A and Si53301-D-GM, the PI6C4931502-04LIEX offers lowest BOM cost and smallest footprint for fixed-frequency HCSL fanout, with externally adjustable output current - ideal for cost-sensitive, space-constrained telecom and networking boards where PLL functionality is unnecessary.
Availability
PI6C4931502-04LIEX is available at Aetrix Electronics and suitable for 10G Ethernet switch clock distribution, PCIe Gen4 reference fanout, and backplane-based telecom timing requiring stable component supply and long-term industrial-grade availability.
Supply support for PI6C4931502-04LIEX 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 industrial, computing, and communications markets.
The PI6C4931502-04LIEX belongs to Diodes' Precision Timing product line, engineered specifically for low-jitter clock distribution in high-speed serial interface systems including PCIe, Ethernet, and CPRI.
FAQ
What is the recommended external resistor value for the IREF pin?
The IREF pin requires a 475Ω ±1% resistor connected to ground to calibrate the HCSL output current to the nominal 17mA per channel. This value is specified in the datasheet's DC Electrical Specifications section and validated across voltage and temperature ranges. Deviations beyond ±5% may cause output amplitude violations or excessive power dissipation.
Can CLK0/nCLK0 and CLK1 be driven simultaneously?
No. The CLK_SEL pin determines active input: logic 0 selects CLK0/nCLK0; logic 1 selects CLK1. Driving both simultaneously violates the function table and may cause undefined output behavior or increased jitter due to internal contention. Only one input source should be active at any time, per the device's static selection architecture.
Is the PI6C4931502-04LIEX pin-compatible with earlier revisions like PI6C4931502-03?
No. The PI6C4931502-04LIEX has distinct pin assignments - notably, CLK1 is on pin 5 (not pin 1), and IREF is on pin 8 (not pin 7). The -03 variant uses different input routing and lacks CLK_SEL functionality. Board-level replacement requires schematic and layout revision; it is not a drop-in upgrade.
Does this device require external termination resistors on HCSL outputs?
Yes. Each HCSL output pair (Q0/nQ0, Q1/nQ1) must be terminated with a 50Ω resistor to VDD–0.8V (i.e., 2.5V supply → 1.7V termination voltage). The device does not integrate termination; external resistors are mandatory to meet HCSL voltage swing (520–800mV VOH) and crossing point (250–550mV VCROSS) specifications.
PI6C4931502-04LIEX 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
- Type:
- Fanout Buffer (Distribution), Multiplexer
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 2:2
- Differential - Input:Output:
- Yes/Yes
- Input:
- LVCMOS, LVTTL
- Output:
- HCSL
- Frequency - Max:
- 250 MHz
- Voltage - Supply:
- 2.375V ~ 3.63V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
PI6C4931502-04LIEX FAQ
1.How can I place an order for PI6C4931502-04LIEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI6C4931502-04LIEX 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 PI6C4931502-04LIEX reliable?
The price and inventory of PI6C4931502-04LIEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6C4931502-04LIEX is usually 5 days.
3.What payment methods are accepted for PI6C4931502-04LIEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6C4931502-04LIEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI6C4931502-04LIEX?
PI6C4931502-04LIEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI6C4931502-04LIEX 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 PI6C4931502-04LIEX?
For technical support, including PI6C4931502-04LIEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6C4931502-04LIEX requirements.
6.How does Aetrix verify that PI6C4931502-04LIEX is sourced from the original manufacturer or authorized distributors?
All PI6C4931502-04LIEX 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 PI6C4931502-04LIEX meets industry standards.
7.What is the process for return or replacement of PI6C4931502-04LIEX?
All PI6C4931502-04LIEX units undergo pre-shipment inspection (PSI). If there is an issue with PI6C4931502-04LIEX, 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 PI6C4931502-04LIEX part is unused and in its original packaging.
Return procedure for PI6C4931502-04LIEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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