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Diodes Incorporated PI49FCT3805CQEX
- Part No.:
- PI49FCT3805CQEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Clock Buffers, Drivers
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI49FCT3805CQEX.pdf
- Description:
- IC CLK BUFFER 1:5 100MHZ 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,129
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Product details
Overview
PI49FCT3805CQEX from Diodes Incorporated is a 3.3V, 2×1:5 non-inverting CMOS clock driver with independent output enables for two groups (A and B), MON monitor output on Group B, and 20-pin QSOP package. It delivers <2.5ns propagation delay, <200ps output skew, and supports up to 166 MHz input frequency in industrial temperature range (–40°C to +85°C) for synchronous clock distribution in FPGA and microprocessor systems.
For engineers reviewing the PI49FCT3805CQEX datasheet, PI49FCT3805CQEX pinout, PI49FCT3805CQEX application, or PI49FCT3805CQEX equivalent, key selection criteria include group-independent enable control, MON output capability, low-skew timing integrity across ten outputs, and 5V-tolerant inputs in a space-constrained QSOP footprint.
Technical Context
The PI49FCT3805CQEX implements dual 1:5 fanout with separate OE inputs (OEA, OEB) enabling independent gating of Group A (OA0–OA4) and Group B (OB0–OB4 + MON). Its MON output replicates Group B's logic state, supporting real-time monitoring without loading the main outputs.
Designed for 3.3V ±10% supply with 5V-tolerant inputs, it features balanced CMOS outputs, <6.0pF input capacitance, and operates across –40°C to +85°C ambient. Propagation delay (INX to OAX/OBX) is guaranteed ≤3.0ns at 133 MHz, with pulse skew ≤270ps and package skew ≤550ps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±10% - Enables direct interface with 3.3V logic while tolerating 5V inputs without level shifters. |
| Max Input Frequency | 166 MHz - Supports high-speed clock distribution for modern FPGAs and processors. |
| Propagation Delay | <2.5ns - Ensures minimal timing budget impact in critical clock paths. |
| Output Skew | <200ps - Maintains tight phase alignment across all ten outputs for synchronous systems. |
| Input Capacitance | <6.0pF - Reduces loading on upstream clock sources and improves signal integrity. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and communications equipment. |
| Enable/Disable Time | 5.2ns - Allows fast dynamic clock gating with minimal glitch risk during power management. |
Pinout & Package
PI49FCT3805CQEX is housed in a 20-pin, 150-mil wide QSOP (Q) package with exposed pad not present; pin pitch is 0.65 mm, body width 3.9 mm, and total length 12.8 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Group A Power Supply | 3.3V supply for OA0–OA4 outputs and INA/OEA circuitry. |
| VCCB | Group B Power Supply | Independent 3.3V supply for OB0–OB4 and MON, enabling voltage domain isolation. |
| INA / INB | Group A/B Clock Inputs | Dedicated TTL/CMOS-compatible inputs accepting 5V logic levels. |
| OEA / OEB | Group A/B Output Enable (Active Low) | Independent tri-state control per group; assertion disables all associated outputs including MON. |
| OA0–OA4 / OB0–OB4 | Non-inverting Clock Outputs | 10 buffered, low-skew CMOS outputs with matched rise/fall times <1.0ns. |
| MON | Group B Monitor Output | Exact replica of OB0–OB4 logic state; used for feedback or status indication without affecting fanout load. |
| GND / GNDA / GNDB / GNDQ | Ground Terminals | Separate ground pins per functional block reduce noise coupling between groups and power domains. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1:5 fanout | Enables split-clock-tree architectures with isolated enable control for power-aware system design. |
| MON output on Group B | Provides real-time visibility into Group B output state without adding capacitive load or requiring external probing. |
| 5V-tolerant inputs | Eliminates need for external level translators when interfacing with legacy 5V clock sources or controllers. |
| Low output skew <200ps | Preserves setup/hold margins in multi-sink synchronous systems such as DDR memory interfaces and parallel bus timing. |
| Industrial temperature range | Ensures reliable operation in uncontrolled environments like base station radios, industrial PLCs, and network switches. |
Applications
| FPGA Clock Distribution | Microprocessor Bus Timing |
|---|---|
|
Use Scenario: Distributing a single reference clock to multiple FPGA banks (I/O, logic, transceivers) requiring matched skew and independent gating. IC Role / Device Role / Timing Role: Primary clock fanout buffer with group-level enable control and MON feedback for configuration verification. Use Value: Eliminates inter-bank skew-induced timing violations and enables dynamic clock shutdown per bank during low-power modes. |
Use Scenario: Driving address/data/control lines in a 32-bit microprocessor-based system with separate memory and peripheral clock domains. IC Role / Device Role / Timing Role: Synchronized clock replication unit delivering phase-aligned clocks to CPU core, memory controller, and peripheral bridges. Use Value: Prevents metastability in asynchronous domain crossings by ensuring sub-200ps inter-output skew across all timing-critical paths. |
| Communications Baseband Processing | Industrial Data Acquisition |
|
Use Scenario: Feeding parallel ADC/DAC sampling clocks and digital signal processor (DSP) timing in LTE/5G baseband cards. IC Role / Device Role / Timing Role: Low-jitter clock distributor with MON output verifying active clock delivery before data capture begins. Use Value: Guarantees deterministic sampling alignment across multi-channel converters, reducing EVM degradation in RF front-ends. |
Use Scenario: Providing synchronized trigger and sampling clocks to multiple isolated sensor nodes in a modular PLC backplane. IC Role / Device Role / Timing Role: Ruggedized clock repeater operating across full industrial temperature range with fault-monitoring capability via MON. Use Value: Maintains timestamp coherence across distributed analog inputs, enabling accurate time-domain analysis of transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock fanout applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PI49FCT3805DQEX | Same silicon die, identical electrical specs, but marked as "D" revision (minor process/test update); pinout and thermal profile identical. | No functional difference; qualified for same industrial applications with identical reliability data. | Select when latest revision compliance (e.g., RoHS 3, halogen-free certification) is required per procurement policy. |
| ICS8305AMLF | 5V-only supply (4.5–5.5V), no 5V-tolerant inputs; higher skew (≤350ps); lacks MON output and independent OEB control. | Suitable only for legacy 5V-only systems; cannot replace PI49FCT3805CQEX in mixed-voltage or MON-dependent designs. | Consider only if existing 5V infrastructure prohibits 3.3V adoption and MON functionality is unused. |
Compared with PI49FCT3805DQEX, the CQEX variant offers identical performance with updated traceability and environmental compliance; versus ICS8305AMLF, it enables lower-voltage operation, tighter skew control, and enhanced monitoring-critical for modern mixed-signal and power-gated systems.
Availability
PI49FCT3805CQEX is available at Aetrix Electronics and suitable for FPGA clock distribution, microprocessor bus timing, communications baseband processing, and industrial data acquisition requiring stable component supply and long-term industrial-grade availability.
Supply support for PI49FCT3805CQEX 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 PI49FCT3805 series belongs to Diodes' high-speed clock buffer product line, engineered specifically for low-skew, multi-output clock distribution in 3.3V systems with 5V input compatibility and industrial temperature resilience.
FAQ
What is the function of the MON output on PI49FCT3805CQEX?
The MON output replicates the logic state of Group B outputs (OB0–OB4) in real time. It is electrically isolated from the main outputs and carries no fanout load, allowing system firmware to verify clock delivery status or detect enable/disable transitions without impacting timing integrity or signal quality on the primary outputs.
Can PI49FCT3805CQEX operate with a 2.5V supply?
No. The PI49FCT3805CQEX is specified only for 3.3V ±10% operation (2.97V to 3.63V). Operation outside this range violates absolute maximum ratings and may cause functional failure or reduced reliability. It is not rated for 2.5V or 1.8V supply rails.
How does the dual VCC/VCCB supply improve system performance?
VCC powers Group A outputs and inputs; VCCB powers Group B outputs and inputs. This separation prevents switching noise from one group from coupling into the other's power rail, reducing crosstalk-induced jitter and maintaining output skew below 200ps even under heavy simultaneous switching conditions.
Is PI49FCT3805CQEX pin-compatible with PI49FCT3805AQEX?
No. PI49FCT3805AQEX is an obsolete variant with different internal architecture (single OE, no MON output, asymmetric group sizing). Pin assignments differ significantly-especially for OE and MON signals-and electrical characteristics (e.g., skew, drive strength) are not interchangeable. Migration requires PCB redesign and firmware validation.
PI49FCT3805CQEX 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:
- 2
- Ratio - Input:Output:
- 1:5
- Differential - Input:Output:
- No/No
- Input:
- CMOS, TTL
- Output:
- CMOS
- Frequency - Max:
- 100 MHz
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-QSOP
PI49FCT3805CQEX FAQ
1.How can I place an order for PI49FCT3805CQEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI49FCT3805CQEX 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 PI49FCT3805CQEX reliable?
The price and inventory of PI49FCT3805CQEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI49FCT3805CQEX is usually 5 days.
3.What payment methods are accepted for PI49FCT3805CQEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI49FCT3805CQEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI49FCT3805CQEX?
PI49FCT3805CQEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI49FCT3805CQEX 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 PI49FCT3805CQEX?
For technical support, including PI49FCT3805CQEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI49FCT3805CQEX requirements.
6.How does Aetrix verify that PI49FCT3805CQEX is sourced from the original manufacturer or authorized distributors?
All PI49FCT3805CQEX 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 PI49FCT3805CQEX meets industry standards.
7.What is the process for return or replacement of PI49FCT3805CQEX?
All PI49FCT3805CQEX units undergo pre-shipment inspection (PSI). If there is an issue with PI49FCT3805CQEX, 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 PI49FCT3805CQEX part is unused and in its original packaging.
Return procedure for PI49FCT3805CQEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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