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Diodes Incorporated PI49FCT20807QEX
- Part No.:
- PI49FCT20807QEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Clock Buffers, Drivers
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI49FCT20807QEX.pdf
- Description:
- IC CLK BUFFER 1:10 150MHZ 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
PI49FCT20807QEX from Diodes Incorporated is a 2.5V high-speed, low-noise, non-inverting 1-to-10 clock buffer optimized for synchronous networking systems. It delivers <150ps output-to-output skew, <3.5ns propagation delay, and supports up to 150MHz input frequency with 3V-tolerant inputs. Used in telecom switch fabric clock distribution where tight skew control across ten outputs is critical.
For engineers reviewing the PI49FCT20807QEX datasheet, PI49FCT20807QEX pinout, PI49FCT20807QEX application, or PI49FCT20807QEX equivalent, key selection criteria include output skew budget, supply voltage compatibility (2.5V VDD, 3V-tolerant inputs), package footprint (20-pin QSOP), thermal limits (–40°C to +85°C), and dynamic current draw at 150MHz.
Technical Context
The PI49FCT20807QEX implements a fully buffered, single-input-to-ten-output clock distribution architecture with dedicated VDD/GND pairs per output group to minimize switching noise coupling. Its internal design enforces matched trace lengths and symmetrical driver stages to achieve sub-150ps intra-package skew under worst-case temperature and voltage conditions.
It operates strictly as a level-sensitive, non-inverting repeater-no PLL, no jitter cleaning, no frequency translation. Input accepts TTL-compatible logic levels (VIH ≥ 1.7V, VIL ≤ 0.7V) while maintaining 2.5V core logic, enabling direct interfacing with 3.3V or 2.5V upstream sources without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Frequency | DC to 150 MHz - supports OC-48/STM-16 and Gigabit Ethernet reference clocks. |
| Output Skew (tSK(o)) | <150 ps max - ensures synchronous sampling across 10 downstream devices within one UI at 150 MHz. |
| Propagation Delay | <3.5 ns max - enables timing closure in high-speed backplane clock trees with minimal added latency. |
| VDD Supply | 2.5 V ± 0.2 V - requires stable low-noise 2.5V rail; multiple VDD pins reduce IR drop and ground bounce. |
| Input Voltage Tolerance | 3V tolerant - interfaces directly with 3.3V LVTTL or LVCMOS sources without external level shifters. |
| Duty Cycle Distortion | <300 ps max - preserves 50% ± 5% duty cycle for DDR and source-synchronous interfaces. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade networking equipment deployment. |
Pinout & Package
PI49FCT20807QEX is housed in a 20-pin QSOP (150-mil wide) package with exposed pad not present; pin assignments are validated per DS43462 Rev 1-2. Power integrity is enhanced by three VDD and four GND pins distributed across the package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BUF_IN | Single differential-capable clock input; TTL/LVCMOS-compatible with 3V tolerance. |
| 4–6, 11–12, 14–15, 17–19 | CLK0–CLK9 | 10 identical CMOS clock outputs; each independently loaded up to 25pF. |
| 2, 7, 10, 13, 16, 20 | VDD | Six dedicated 2.5V supply connections-reduces simultaneous switching noise and improves PSRR. |
| 3, 8–9, 18 | GND | Four ground terminals-provides low-inductance return paths for all output drivers and input buffer. |
Key Features
| Feature | Design Value |
|---|---|
| Low-skew clock fanout | 150ps max output-to-output skew enables deterministic timing across 10 ASIC/FPGA clock domains. |
| Multi-rail power layout | Three VDD and four GND pins isolate noise between output banks-critical for mixed-signal SoC clocking. |
| 3V-tolerant input | Accepts 3.3V logic signals directly into 2.5V core-eliminates need for discrete level-shifting circuitry. |
| Industrial temperature range | –40°C to +85°C operation supports deployment in carrier-grade access equipment and base station radios. |
Applications
| Telecom Switch Fabric Clocking | Network Processor Interface |
|---|---|
Use Scenario: Distributing a master reference clock to 10 line-card FPGAs in a modular chassis-based switch. IC Role / Device Role / Timing Role: Non-inverting 1:10 fanout buffer ensuring sub-UI skew across distributed clock domains. Use Value: Enables synchronous packet forwarding across line cards without inter-chassis deskew compensation. | Use Scenario: Driving clock inputs of dual-core network processors requiring matched clock arrival across CPU, DMA, and I/O subsystems. IC Role / Device Role / Timing Role: Low-jitter, low-skew clock repeater feeding parallel clock domains within a single SoC interface. Use Value: Maintains setup/hold margins for 200+ MHz DDR2 memory interfaces and 1Gbps SerDes lanes. |
| Optical Transport Module | Industrial Ethernet Gateway |
Use Scenario: Providing synchronized 125MHz clocks to multiple transceiver PHYs in a 10G OTU2 framer module. IC Role / Device Role / Timing Role: High-frequency clock distribution node with guaranteed skew performance at full data rate. Use Value: Eliminates bit-error-rate degradation caused by inter-PHY clock misalignment in FEC-enabled links. | Use Scenario: Clocking redundant Ethernet MAC controllers and real-time PLC communication co-processors in factory automation gateways. IC Role / Device Role / Timing Role: Industrial-grade clock fanout device supporting deterministic I/O synchronization. Use Value: Ensures sub-microsecond time-stamp correlation across dual-port IEEE 1588 PTP stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICS8302AMLF | 3.3V-only supply; 2.5V outputs not supported; 200ps skew spec. | Requires external regulator for 2.5V systems; less suitable for mixed-voltage backplanes. | Select only if system uses 3.3V rails exclusively and skew budget allows +50ps margin. |
| PI6C20400LEX | LVDS outputs; differential signaling; 1.8V core; no 3V-tolerant input. | Designed for point-to-point high-speed links-not for multi-drop CMOS fanout. | Choose when driving long traces or ECL-compatible loads; not drop-in for PI49FCT20807QEX's CMOS bus topology. |
Compared with ICS8302AMLF and PI6C20400LEX, PI49FCT20807QEX uniquely combines 2.5V operation, 3V-tolerant input, and sub-150ps skew in a cost-effective QSOP package-making it optimal for legacy and hybrid-voltage telecom infrastructure.
Availability
PI49FCT20807QEX is available at Aetrix Electronics and suitable for telecom switch fabric clocking, network processor interface, optical transport modules, and industrial Ethernet gateways requiring stable component supply and long-term lifecycle support.
Supply support for PI49FCT20807QEX 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 PI49FCT20807 belongs to Diodes' Pericom timing portfolio, engineered specifically for low-skew, high-frequency clock distribution in synchronous digital systems-emphasizing signal integrity over frequency synthesis.
FAQ
What is the maximum capacitive load per CLK output?
Each CLK output is rated for 10pF to 25pF total capacitive load, including PCB trace, probe, and downstream input capacitance. At 150MHz and 12pF load, rise/fall time remains ≤1.2ns and skew stays within 150ps specification. Exceeding 25pF may increase propagation delay and degrade duty cycle distortion beyond 300ps.
Does PI49FCT20807QEX require external termination resistors?
No external termination is required. The device drives standard CMOS loads directly with 24mA drive strength (IOH/IOL = ±8mA). For controlled-impedance traces >50Ω, series termination at the source or parallel termination at the receiver may be used-but these are board-level design choices, not IC requirements.
Can BUF_IN accept AC-coupled clock signals?
Yes-BUF_IN supports AC-coupled inputs when DC bias is restored via on-die or external bias network. The input stage includes internal clamping diodes (VIK = –0.7V min) and operates down to DC, but AC-coupled use requires external 50–100kΩ pull-up/pull-down to establish valid VIH/VIL thresholds per datasheet specs.
Is PI49FCT20807QEX qualified for automotive applications?
No-PI49FCT20807QEX is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., PI49FCT20807QE-A) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening-but QEX suffix denotes commercial/industrial grade only.
PI49FCT20807QEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 49FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Fanout Buffer (Distribution)
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:10
- Differential - Input:Output:
- No/No
- Input:
- CMOS, TTL
- Output:
- CMOS, TTL
- Frequency - Max:
- 150 MHz
- Voltage - Supply:
- 2.3V ~ 2.7V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-QSOP
PI49FCT20807QEX FAQ
1.How can I place an order for PI49FCT20807QEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI49FCT20807QEX 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 PI49FCT20807QEX reliable?
The price and inventory of PI49FCT20807QEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI49FCT20807QEX is usually 5 days.
3.What payment methods are accepted for PI49FCT20807QEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI49FCT20807QEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI49FCT20807QEX?
PI49FCT20807QEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI49FCT20807QEX 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 PI49FCT20807QEX?
For technical support, including PI49FCT20807QEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI49FCT20807QEX requirements.
6.How does Aetrix verify that PI49FCT20807QEX is sourced from the original manufacturer or authorized distributors?
All PI49FCT20807QEX 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 PI49FCT20807QEX meets industry standards.
7.What is the process for return or replacement of PI49FCT20807QEX?
All PI49FCT20807QEX units undergo pre-shipment inspection (PSI). If there is an issue with PI49FCT20807QEX, 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 PI49FCT20807QEX part is unused and in its original packaging.
Return procedure for PI49FCT20807QEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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