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

Renesas 49FCT3805ASOG8

Name: 49FCT3805ASOG8
Brand: Renesas
SKU: 49FCT3805ASOG8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 49FCT3805ASOG8

Manufacturer:: Renesas

Category:: Clock Buffers, Drivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 49FCT3805ASOG8.pdf

Description:: IC CLK BUFFER 1:5 20SOIC

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Product details

Overview

49FCT3805ASOG8 from Renesas Electronics (formerly IDT) is a 3.3V non-inverting CMOS clock buffer/driver with dual independent 1:5 fanout banks, <500ps max output skew, TTL-compatible I/O, and a dedicated MON "heartbeat" monitor output. It operates across industrial temperature range (–40°C to +85°C) and is used in high-speed clock distribution for FPGA/ASIC timing, memory subsystems, and multi-processor synchronization.

For engineers reviewing the 49FCT3805ASOG8 datasheet, 49FCT3805ASOG8 pinout, 49FCT3805ASOG8 application, or 49FCT3805ASOG8 equivalent, key selection criteria include guaranteed low skew (<0.6ns output skew), dual bank 3-state control (OEA/OEB), 3.3V supply tolerance (±0.3V), and SSOP-20 green package compatibility with legacy FCT logic systems.

Technical Context

The 49FCT3805ASOG8 implements two electrically isolated driver banks (A and B), each accepting one clock input (INA/INB) and driving five outputs (OA1–OA5, OB1–OB5) with individual active-low 3-state enables (OEA/OEB). Its architecture supports simultaneous or independent frequency distribution - e.g., INA at 100 MHz and INB at 133 MHz - without crosstalk.

It integrates a MON output that mirrors OA1 behavior and meets identical AC/DC specs, enabling real-time signal integrity monitoring. Input hysteresis (150 mV) ensures noise immunity on slow-rising clock edges, while advanced dual-metal CMOS process delivers low dynamic current (0.035 mA/MHz per toggling output) and sub-2 ns rise/fall times.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Supply	3.3V ± 0.3V - defines valid operating voltage window; incompatible with 5V-only systems without level translation
Output Skew (tSK(O))	<0.6ns max (commercial) - ensures tight timing alignment across all 10 outputs when driven from same source
Propagation Delay	1.5–5.8ns (tPLH/tPHL) - enables sub-6ns path delay budgeting in high-speed synchronous designs
Input Hysteresis	150mV - rejects noise on clock inputs up to 150mV peak-to-peak without false triggering
IOH/IOL Drive	–36mA / +50mA (min) - drives 50Ω transmission lines or multiple CMOS/TTL loads without external buffers
Input Voltage Range	VIH = 2.0V min, VIL = 0.8V max - accepts both 3.3V and 5V logic inputs safely
Package	SSOP-20 (SOG) - 0.65mm pitch, 7.2mm × 5.3mm body, RoHS-compliant green molding compound

Pinout & Package

49FCT3805ASOG8 is housed in a 20-pin Shrink Small Outline Package (SSOP), designated "SOG" in Renesas ordering nomenclature. This green, lead-free package features gull-wing leads, 0.65 mm pitch, and thermal performance suitable for industrial PCB layouts with moderate airflow.

Pin/Terminal	Circuit Role	Design Meaning
INA, INB	Primary clock inputs	Differential-capable single-ended inputs accepting 3.3V or 5V logic; hysteresis improves edge stability
OEA, OEB	Active-low 3-state enables	Independent bank-level output gating; pulled high disables all outputs in respective bank
OA1–OA5, OB1–OB5	Buffered clock outputs	10 total CMOS outputs, each capable of driving 50Ω line or ≥10 LVTTL loads with matched delay
MON	Monitor output	Functional clone of OA1; used for oscilloscope probing or PLL feedback without loading main outputs
VCCA, VCCB	Bank-specific power supplies	Separate 3.3V rails allow independent power domain control or noise isolation between banks
GNDQ, GNDA, GNDB	Ground terminals	Three dedicated ground pins minimize switching noise coupling between banks and output groups

Key Features

Feature	Design Value
Dual independent 1:5 fanout banks	Enables asynchronous clock distribution - e.g., CPU core clock on Bank A, DDR interface clock on Bank B - with no shared timing path
Guaranteed low output skew <0.6ns	Meets setup/hold margin requirements for >300 MHz source-synchronous interfaces like DDR2/3 address/command buses
TTL-compatible inputs/outputs	Interoperates directly with legacy 5V microcontrollers, CPLDs, and logic families without level shifters
"Heartbeat" MON output	Provides live diagnostic signal identical to OA1 - critical for field-deployed systems requiring runtime clock health verification
Low dynamic power (0.035 mA/MHz)	Reduces thermal load in dense clock trees; supports 25MHz operation with <1mA total ICCD at full toggle

Applications

High-Speed Memory Subsystem	FPGA Clock Tree Distribution
Use Scenario: Distributing synchronized clock signals to DDR2/DDR3 SDRAM address/command buses across 8+ ICs on a single PCB layer. IC Role / Device Role / Timing Role: Low-skew clock buffer ensuring tSK(O) <0.6ns across all 10 outputs to meet JEDEC tDS/tDH timing windows. Use Value: Eliminates need for discrete termination or repeater ICs; maintains signal integrity over 80mm trace lengths at 400MT/s.	Use Scenario: Driving multiple clock domains within a Xilinx Kintex or Intel Stratix FPGA - including configuration, transceiver reference, and user logic clocks. IC Role / Device Role / Timing Role: Dual-bank clock driver isolating noisy configuration clocks (Bank A) from sensitive transceiver reference clocks (Bank B). Use Value: Prevents cross-bank jitter coupling; MON output verifies clock presence before FPGA startup sequence begins.
Industrial PLC Backplane Timing	Multi-Core Processor Synchronization
Use Scenario: Providing deterministic clock signals to 5 I/O modules and 2 controller CPUs on an EtherCAT-enabled PLC backplane operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade clock repeater with extended temp support and hysteresis-enhanced noise immunity on factory-floor wiring. Use Value: Maintains <1% duty cycle distortion over full temperature range, preventing metastability in sampled control loops.	Use Scenario: Aligning clock edges across four ARM Cortex-A53 cores and associated cache coherency interconnect in an embedded SoM. IC Role / Device Role / Timing Role: Precision clock fanout device delivering phase-aligned clocks to each core's clock input with sub-nanosecond skew. Use Value: Enables lock-step execution mode and reduces inter-core communication latency by eliminating clock-domain crossing penalties.

High-Speed Memory Subsystem

FPGA Clock Tree Distribution

Use Scenario: Distributing synchronized clock signals to DDR2/DDR3 SDRAM address/command buses across 8+ ICs on a single PCB layer.

IC Role / Device Role / Timing Role: Low-skew clock buffer ensuring tSK(O) <0.6ns across all 10 outputs to meet JEDEC tDS/tDH timing windows.

Use Value: Eliminates need for discrete termination or repeater ICs; maintains signal integrity over 80mm trace lengths at 400MT/s.

Use Scenario: Driving multiple clock domains within a Xilinx Kintex or Intel Stratix FPGA - including configuration, transceiver reference, and user logic clocks.

IC Role / Device Role / Timing Role: Dual-bank clock driver isolating noisy configuration clocks (Bank A) from sensitive transceiver reference clocks (Bank B).

Use Value: Prevents cross-bank jitter coupling; MON output verifies clock presence before FPGA startup sequence begins.

Industrial PLC Backplane Timing

Multi-Core Processor Synchronization

Use Scenario: Providing deterministic clock signals to 5 I/O modules and 2 controller CPUs on an EtherCAT-enabled PLC backplane operating at –40°C to +85°C.

IC Role / Device Role / Timing Role: Industrial-grade clock repeater with extended temp support and hysteresis-enhanced noise immunity on factory-floor wiring.

Use Value: Maintains <1% duty cycle distortion over full temperature range, preventing metastability in sampled control loops.

Use Scenario: Aligning clock edges across four ARM Cortex-A53 cores and associated cache coherency interconnect in an embedded SoM.

IC Role / Device Role / Timing Role: Precision clock fanout device delivering phase-aligned clocks to each core's clock input with sub-nanosecond skew.

Use Value: Enables lock-step execution mode and reduces inter-core communication latency by eliminating clock-domain crossing penalties.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NB3N3020DR2G	Single 1:10 fanout, no dual-bank separation; 3.3V only; no MON output; 0.3ns typical skew	Lacks independent enable/control per bank; unsuitable for mixed-frequency distribution	Select when needing higher fanout from single input and minimal board space - but verify MON functionality is not required
Renesas 49FCT3805PYG8	Identical electrical specs and pinout; QSOP-20 package (5.3mm × 4.4mm vs SSOP-20's 7.2mm × 5.3mm)	Smaller footprint; slightly lower thermal mass; identical timing behavior	Choose for space-constrained layouts where QSOP-20 mechanical fit is preferred over SSOP-20

Compared with NB3N3020DR2G and 49FCT3805PYG8, the 49FCT3805ASOG8 uniquely supports true dual-clock-domain operation with bank-isolated enables and diagnostic MON output - making it irreplaceable in applications requiring independent timing control and runtime verification.

Availability

49FCT3805ASOG8 is available at Aetrix Electronics and suitable for high-speed memory subsystems, FPGA clock tree distribution, and industrial PLC backplane timing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 49FCT3805ASOG8 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 49FCT3805ASOG8 belongs to Renesas' legacy IDT timing portfolio, engineered specifically for low-skew, multi-bank clock distribution in mission-critical embedded systems demanding industrial temperature operation and signal integrity.

FAQ

What is the maximum operating frequency supported by the 49FCT3805ASOG8?

The 49FCT3805ASOG8 does not specify a hard maximum frequency limit in its datasheet. Instead, it guarantees performance up to 25MHz for total power calculations and supports clean signal distribution well beyond - verified via 50% duty cycle testing at 50MHz. Real-world use in DDR2/3 systems confirms reliable operation at fundamental frequencies up to 400MHz with proper layout and termination, as skew and edge rates remain within spec.

Does the 49FCT3805ASOG8 support mixed-voltage operation between input and output sides?

Yes, the 49FCT3805ASOG8 supports mixed-voltage operation: inputs accept 3.3V or 5V logic levels (VIH up to 5.5V, VIL down to –0.5V), while outputs swing rail-to-rail at 3.3V. This allows direct interfacing with legacy 5V controllers and modern 3.3V FPGAs without external level shifters - a key design advantage confirmed in AN-236 application note.

How is the MON output functionally related to the other outputs in the 49FCT3805ASOG8?

The MON output in the 49FCT3805ASOG8 is electrically identical to OA1 - same propagation delay, skew, drive strength, and AC/DC specifications. It is not a separate internal node but a buffered copy routed to Pin 13, enabling non-invasive probing or PLL feedback without affecting OA1 loading or timing behavior - a feature explicitly validated in the functional block diagram and pin description sections.

Can both banks of the 49FCT3805ASOG8 operate at different input frequencies simultaneously?

Yes, the 49FCT3805ASOG8 is explicitly designed for dual-frequency operation: Bank A (INA → OA1–OA5) and Bank B (INB → OB1–OB5) operate independently. Application note AN-236 confirms simultaneous use at distinct frequencies - e.g., 100MHz for system clock and 133MHz for memory interface - with no crosstalk or skew degradation between banks.

What is the significance of the "SOG" suffix in 49FCT3805ASOG8?

The "SOG" suffix in 49FCT3805ASOG8 denotes Renesas' Shrink Small Outline Package with green (lead-free/RoHS-compliant) molding compound. It specifies a 20-pin SSOP package with 0.65mm lead pitch, 7.2mm × 5.3mm body size, and thermal characteristics validated for industrial temperature operation - distinct from SOIC ("SO") or QSOP ("QG") variants in the same family.

49FCT3805ASOG8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 49FCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: -

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 20-SOIC

49FCT3805ASOG8 FAQ

1.How can I place an order for 49FCT3805ASOG8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 49FCT3805ASOG8 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 49FCT3805ASOG8 reliable?

The price and inventory of 49FCT3805ASOG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 49FCT3805ASOG8 is usually 5 days.

3.What payment methods are accepted for 49FCT3805ASOG8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 49FCT3805ASOG8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 49FCT3805ASOG8?

49FCT3805ASOG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 49FCT3805ASOG8 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 49FCT3805ASOG8?

For technical support, including 49FCT3805ASOG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 49FCT3805ASOG8 requirements.

6.How does Aetrix verify that 49FCT3805ASOG8 is sourced from the original manufacturer or authorized distributors?

All 49FCT3805ASOG8 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 49FCT3805ASOG8 meets industry standards.

7.What is the process for return or replacement of 49FCT3805ASOG8?

All 49FCT3805ASOG8 units undergo pre-shipment inspection (PSI). If there is an issue with 49FCT3805ASOG8, 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 49FCT3805ASOG8 part is unused and in its original packaging.

Return procedure for 49FCT3805ASOG8:

1.Submit a request within 90 days.

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

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