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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Buffers, Drivers

Renesas 49FCT3805EQGI8

Name: 49FCT3805EQGI8
Brand: Renesas
SKU: 49FCT3805EQGI8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 49FCT3805EQGI8

Manufacturer:: Renesas

Category:: Clock Buffers, Drivers

Package:: 20-SSOP (0.209", 5.30mm Width)

Datasheet:: 49FCT3805EQGI8.pdf

Description:: IC CLK BUFFER 1:5 166MHZ 20SSOP

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Product details

Overview

49FCT3805EQGI8 from Renesas Electronics is a 3.3V CMOS dual 1-to-5 clock driver with two independent output banks, each offering 1:5 fanout and individual 3-state enable control (OEA/OEB), low skew (<200ps max), propagation delay <2.5ns max, and operating frequency up to 166MHz - used in high-speed clock distribution for industrial computing and telecom backplanes.

For engineers reviewing the 49FCT3805EQGI8 datasheet, 49FCT3805EQGI8 pinout, 49FCT3805EQGI8 application, or 49FCT3805EQGI8 equivalent, key selection criteria include guaranteed inter-output skew, TTL-compatible 3.3V/5V mixed-voltage input support, MON "heartbeat" diagnostic output, and SSOP-20 green package compliance.

Technical Context

The 49FCT3805EQGI8 implements two fully isolated clock distribution paths: Bank A (INA → OA1–OA5) and Bank B (INB → OB1–OB5), each with dedicated active-low 3-state enables. All outputs-including MON-are identical in drive strength, timing, and electrical specs.

It supports simultaneous operation at different input frequencies per bank, includes a dedicated monitor output replicating any enabled bank's signal for PLL feedback or system diagnostics, and features low-capacitance inputs (CIN ≤ 4pF) and outputs (COUT ≤ 6pF) optimized for high-fidelity signal integrity on transmission lines.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	VCC = 3.3V ± 0.3V - fixed low-voltage rail enabling compatibility with modern 3.3V logic systems while tolerating board-level variation.
Max Input Frequency	166MHz - supports high-speed synchronous bus clocks including PCI-X, DDR memory interfaces, and packet-switching fabric timing.
Output Skew (tSK(O))	<200ps max - ensures sub-nanosecond alignment across all five outputs within one bank, critical for parallel data capture timing margins.
Propagation Delay	<2.5ns max (tPLH/tPHL) - enables tight setup/hold windows in multi-chip synchronous designs with minimal added latency.
Input Compatibility	TTL-compatible with 3.3V or 5V driving sources - allows seamless integration into mixed-voltage legacy or hybrid systems without level-shifting.
Monitor Output	MON replicates enabled bank output - provides non-invasive clock monitoring for PLL lock detection or real-time signal health verification.
Operating Temperature	–40°C to +85°C - qualified for industrial-grade reliability in base stations, industrial controllers, and network edge equipment.

Pinout & Package

49FCT3805EQGI8 is housed in a 20-pin QSOP (Quarter-size Small Outline IC) green package (QG suffix), measuring 7.2mm × 4.4mm with 0.635mm pitch - compatible with standard surface-mount assembly processes and IPC-7351B footprint QSO20_720x440_P0635.

Pin/Terminal	Circuit Role	Design Meaning
INA, INB	Primary clock inputs	Differential-pair insensitive single-ended inputs accepting TTL-level transitions; support independent frequency domains per bank.
OEA, OEB	Active-low 3-state enables	Enable/disable entire output banks independently - essential for dynamic power gating and clock domain isolation during sleep states.
OA1–OA5, OB1–OB5	CMOS clock outputs	Five matched-drive outputs per bank; all electrically identical including MON - guarantee uniform loading and skew-controlled fanout.
MON	Monitor output	Exact replica of enabled bank output - used for PLL reference, oscilloscope probing, or fault detection without loading primary outputs.
VCCA, VCCB	Independent power rails	Separate VCC pins per bank allow localized decoupling and noise isolation between clock domains - improves PSRR and reduces crosstalk.
GNDQ, GNDA, GNDB	Ground terminals	Dedicated ground returns per functional block (quiescent, bank A, bank B) minimize shared-impedance coupling and ground bounce.

Key Features

Feature	Design Value
Dual independent 1:5 fanout banks	Enables split-clock-domain architectures - e.g., CPU core clock on Bank A, I/O subsystem clock on Bank B - with no inter-bank timing dependency.
Guaranteed <200ps output skew	Ensures deterministic phase alignment across all five outputs in a bank - eliminates timing uncertainty in parallel bus receivers or multi-lane SerDes clock recovery.
"Heartbeat" MON output	Provides live, unloaded copy of active bank output - simplifies in-system validation and eliminates need for external tap points or probe loading effects.
3.3V/5V mixed-input tolerance	Accepts legacy 5V TTL signals directly into 3.3V system - avoids external level shifters in upgrade paths or mixed-generation board designs.
Low dynamic current (125mA max @ 166MHz)	Reduces local power delivery demands and thermal density - supports dense clock tree layouts in space-constrained telecom modules.

Applications

High-Speed Memory Subsystem	Industrial PLC Backplane
Use Scenario: Distributing synchronized clock signals to multiple DDR2/DDR3 memory chips on a single DIMM or controller interface. IC Role / Device Role / Timing Role: Dual-bank clock driver providing matched-phase clocks to address/command and data lanes, with MON feeding memory controller PLL feedback. Use Value: Sub-200ps skew ensures setup/hold timing margins are preserved across all DRAM devices, preventing read/write errors at 166MHz operation.	Use Scenario: Driving real-time I/O module clocks across modular PLC chassis with strict deterministic jitter requirements. IC Role / Device Role / Timing Role: Isolating CPU clock domain (Bank A) from fieldbus interface clock domain (Bank B), each with independent enable control for power management. Use Value: Independent VCCA/VCCB rails and ground separation reduce cross-domain noise coupling - critical for SIL2-certified control loops.
Telecom Line Card	Test Equipment Clock Tree
Use Scenario: Fanout of reference clocks to multiple SERDES PHYs, framer ICs, and packet processors on carrier-grade line cards. IC Role / Device Role / Timing Role: Low-skew clock distribution hub with MON output routed to on-board jitter analyzer for continuous signal health monitoring. Use Value: MON output eliminates need for external splitters or probes - preserves signal integrity while enabling real-time diagnostics without impacting main clock path.	Use Scenario: Building hierarchical clock trees in automated test equipment requiring precise phase alignment across stimulus and capture channels. IC Role / Device Role / Timing Role: Providing five identically timed clock outputs per bank to synchronize multiple ADC/DAC channels or digital pattern generators. Use Value: Guaranteed tSK(O) <200ps ensures channel-to-channel timing correlation remains within ±100ps - meeting IEEE 1149.6 AC-JTAG and high-speed boundary-scan requirements.

High-Speed Memory Subsystem

Industrial PLC Backplane

Use Scenario: Distributing synchronized clock signals to multiple DDR2/DDR3 memory chips on a single DIMM or controller interface.

IC Role / Device Role / Timing Role: Dual-bank clock driver providing matched-phase clocks to address/command and data lanes, with MON feeding memory controller PLL feedback.

Use Value: Sub-200ps skew ensures setup/hold timing margins are preserved across all DRAM devices, preventing read/write errors at 166MHz operation.

Use Scenario: Driving real-time I/O module clocks across modular PLC chassis with strict deterministic jitter requirements.

IC Role / Device Role / Timing Role: Isolating CPU clock domain (Bank A) from fieldbus interface clock domain (Bank B), each with independent enable control for power management.

Use Value: Independent VCCA/VCCB rails and ground separation reduce cross-domain noise coupling - critical for SIL2-certified control loops.

Telecom Line Card

Test Equipment Clock Tree

Use Scenario: Fanout of reference clocks to multiple SERDES PHYs, framer ICs, and packet processors on carrier-grade line cards.

IC Role / Device Role / Timing Role: Low-skew clock distribution hub with MON output routed to on-board jitter analyzer for continuous signal health monitoring.

Use Value: MON output eliminates need for external splitters or probes - preserves signal integrity while enabling real-time diagnostics without impacting main clock path.

Use Scenario: Building hierarchical clock trees in automated test equipment requiring precise phase alignment across stimulus and capture channels.

IC Role / Device Role / Timing Role: Providing five identically timed clock outputs per bank to synchronize multiple ADC/DAC channels or digital pattern generators.

Use Value: Guaranteed tSK(O) <200ps ensures channel-to-channel timing correlation remains within ±100ps - meeting IEEE 1149.6 AC-JTAG and high-speed boundary-scan requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NB3N3010DR2G	Single 1:10 LVDS output bank; requires external termination; no MON output; 3.3V only; max f = 150MHz.	Limited to single-domain LVDS systems; lacks dual-bank isolation and diagnostic monitor capability.	Select when LVDS signaling and higher fanout (1:10) outweigh need for TTL compatibility and dual-bank flexibility.
TI CDCLVC1107PWR	LVCMOS/LVTTL 1:7 fanout; single bank; no MON; 3.3V only; max f = 250MHz; lower skew (70ps).	Higher speed but no independent bank control or mixed-voltage input support - unsuitable for split-domain or legacy interface integration.	Select when maximum speed and lowest skew are prioritized over dual-bank operation and 5V-tolerant inputs.

Compared with NB3N3010DR2G and CDCLVC1107PWR, the 49FCT3805EQGI8 uniquely delivers dual independent banks with 3.3V/5V input tolerance, integrated MON output, and industrial temperature qualification - making it optimal for mixed-signal, multi-domain, and legacy-integration clock distribution where flexibility and diagnostics matter more than raw speed or LVDS compliance.

Availability

49FCT3805EQGI8 is available at Aetrix Electronics and suitable for industrial computing, telecom infrastructure, and test equipment applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for 49FCT3805EQGI8 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and infrastructure markets.

The IDT FCT3800 family - including the 49FCT3805EQGI8 - was designed specifically for high-fidelity, low-skew clock distribution in industrial and telecom systems where signal integrity, mixed-voltage interoperability, and diagnostic visibility are mandatory.

FAQ

What is the maximum operating frequency supported by the 49FCT3805EQGI8?

The 49FCT3805EQGI8 supports an input frequency of up to 166MHz, as specified in its switching characteristics table for the "E" speed grade. This rating applies to both INA and INB inputs independently, and all outputs (OA1–OA5, OB1–OB5, and MON) maintain full timing compliance at this frequency under industrial temperature conditions (–40°C to +85°C) and VCC = 3.3V ± 0.3V.

Does the 49FCT3805EQGI8 support 5V-tolerant inputs?

Yes, the 49FCT3805EQGI8 accepts 5V TTL-level inputs on INA and INB while operating from a 3.3V supply - explicitly confirmed in its features and DC electrical characteristics (VIH up to 5.5V, VIL down to –0.5V). This allows direct interfacing with legacy 5V logic without external level shifters, a key design advantage over many modern 3.3V-only clock drivers.

What is the function of the MON pin on the 49FCT3805EQGI8?

The MON pin on the 49FCT3805EQGI8 is a dedicated monitor output that replicates the signal present on any enabled output bank (A or B) - identical in waveform, timing, drive strength, and electrical specs. It is used for non-invasive clock verification, PLL reference, or real-time signal health monitoring without loading the primary output banks.

How does the 49FCT3805EQGI8 handle power supply separation between clock banks?

The 49FCT3805EQGI8 provides physically separate VCCA and VCCB supply pins - one for each clock bank - along with dedicated ground terminals (GNDA, GNDB, GNDQ). This layout minimizes power supply coupling between banks, improves PSRR, and supports independent decoupling, which is essential for maintaining low jitter and noise isolation in mixed-domain timing systems.

Is the 49FCT3805EQGI8 pin-compatible with earlier IDT FCT3805 variants?

Yes, the 49FCT3805EQGI8 shares the same 20-pin QSOP (QG) package and pinout as other IDT49FCT3805D/E variants, including identical pin functions (e.g., OEA/OEB enables, MON, VCCA/VCCB, and OA1–OA5/OB1–OB5 assignments). This ensures drop-in replacement capability across speed grades and temperature ranges within the FCT3805 family.

49FCT3805EQGI8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 49FCT

Package/Case:: 20-SSOP (0.209", 5.30mm 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, LVTTL

Output:: CMOS, LVTTL

Frequency - Max:: 166 MHz

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 20-SSOP

49FCT3805EQGI8 FAQ

1.How can I place an order for 49FCT3805EQGI8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 49FCT3805EQGI8 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 49FCT3805EQGI8 reliable?

The price and inventory of 49FCT3805EQGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 49FCT3805EQGI8 is usually 5 days.

3.What payment methods are accepted for 49FCT3805EQGI8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 49FCT3805EQGI8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 49FCT3805EQGI8?

49FCT3805EQGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 49FCT3805EQGI8 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 49FCT3805EQGI8?

For technical support, including 49FCT3805EQGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 49FCT3805EQGI8 requirements.

6.How does Aetrix verify that 49FCT3805EQGI8 is sourced from the original manufacturer or authorized distributors?

All 49FCT3805EQGI8 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 49FCT3805EQGI8 meets industry standards.

7.What is the process for return or replacement of 49FCT3805EQGI8?

All 49FCT3805EQGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 49FCT3805EQGI8, 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 49FCT3805EQGI8 part is unused and in its original packaging.

Return procedure for 49FCT3805EQGI8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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