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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Renesas 9DB233AGLFT

Name: 9DB233AGLFT
Brand: Renesas
SKU: 9DB233AGLFT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 9DB233AGLFT

Manufacturer:: Renesas

Category:: Application Specific Clock/Timing

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 9DB233AGLFT.pdf

Description:: IC CLK FANOUT/BUFF ZD 20TSSOP

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Product details

Overview

9DB233AGLFT from Renesas Electronics (formerly IDT) is a two-output, 0.7V current-mode differential HCSL zero-delay buffer optimized for PCIe Gen3 clock distribution. It supports selectable PLL bandwidth (0.4–4 MHz), achieves <1.0 ps RMS PCIe Gen3 phase jitter, and features dual active-low OE# pins for ExpressCard-compatible output control. Used in server motherboard clock trees to fan out reference clocks to multiple PCIe slots.

For engineers reviewing the 9DB233AGLFT datasheet, 9DB233AGLFT pinout, 9DB233AGLFT application, or 9DB233AGLFT equivalent, this page delivers verified technical context, PCIe Gen3-compliant jitter specs, SMBus-configurable PLL operation, and real-world routing guidance for HCSL differential pairs - critical for low-EMI, high-integrity PCIe timing systems.

Technical Context

The 9DB233AGLFT implements a dual-output, current-mode HCSL buffer with integrated PLL capable of operating in either jitter-reducing PLL mode (2–4 MHz bandwidth) or low-latency bypass mode. Its differential SRC_IN/SRC_IN# inputs accept 0.7V HCSL signals, while DIF_0/DIF_0# and DIF_1/DIF_1# outputs drive 100Ω differential loads with matched slew rates (0.6–4 V/ns) and <50 ps output-to-output skew.

PLL configuration is managed via SMBus interface (SMBDAT/SMBCLK, 5V-tolerant), enabling dynamic selection of bandwidth and bypass mode. The IREF pin sets output current using an external 475Ω resistor, establishing precise 0.7V common-mode voltage and 300–1557 mV differential swing across temperature and supply variation.

Key Specifications

Parameter	Value and Actual Design Meaning
PCIe Gen3 Phase Jitter	<1.0 ps RMS (measured at 100 MHz, PLL BW = 2–4 MHz); meets PCI-SIG Gen3 specification for downstream clock integrity.
Cycle-to-Cycle Jitter	<50 ps (peak-to-peak); ensures stable setup/hold timing margins for PCIe receivers.
Output-to-Output Skew	<50 ps (typ. 16–50 ps); enables simultaneous clocking of multiple PCIe endpoints without inter-lane timing misalignment.
Output Type	Two 0.7V current-mode differential HCSL pairs (DIF_0/DIF_0#, DIF_1/DIF_1#); compatible with standard PCIe REF_CLK inputs without level-shifting.
PLL Bandwidth Options	Selectable 0.4–1 MHz (low BW) or 2–4 MHz (high BW); minimizes jitter peaking in cascaded PLL systems and tracks spread-spectrum input clocks.
SMBus Interface	5V-tolerant SMBDAT/SMBCLK; allows runtime reconfiguration of PLL mode, bandwidth, and output enable states without hardware changes.
Operating Temperature	0°C to +70°C (commercial grade); validated for stable performance in server and storage board environments.

Pinout & Package

9DB233AGLFT is housed in a 20-pin TSSOP package (4.4 mm narrow body, RoHS-compliant, "LF" suffix), with 4× VDD (pins 5,9,12,16), 2× GND (6,15), and dedicated GNDA/VDDA (pins 19,20) for PLL core isolation.

Pin/Terminal	Circuit Role	Design Meaning
1 (PLL_BW)	PLL bandwidth select input	Logic-high selects high-bandwidth PLL mode (2–4 MHz); logic-low selects low-bandwidth mode (0.4–1 MHz) for improved spread-spectrum tracking.
2–3 (SRC_IN / SRC_IN#)	Differential clock input pair	Accepts 0.7V HCSL reference clock (e.g., from IDT 932S421); 300 mV min differential swing, 150–900 mV crossover voltage.
4,17 (vOE0# / vOE1#)	Active-low output enable	Internal 120 kΩ pull-down; asserts to disable corresponding DIF pair; enables ExpressCard hot-plug sequencing.
7–8,13–14 (DIF_0 / DIF_0# / DIF_1 / DIF_1#)	Differential HCSL outputs	0.7V current-mode outputs; require 475Ω IREF-to-GND for 100Ω differential impedance; support 100 MHz PCIe Gen3 operation.
10–11 (SMBDAT / SMBCLK)	SMBus interface	5V-tolerant bidirectional data/clock; enables runtime PLL mode switching and diagnostics without reset.
18 (IREF)	Output current reference	Drives external 475Ω resistor to GND; sets 2.32 mA reference current, defining 0.7V common-mode and 6× IREF output drive strength.

Key Features

Feature	Design Value
Spread-spectrum clock compatibility	Tracks triangular-modulated input clocks (30–33 kHz) without introducing additional jitter; reduces EMI in dense PCB layouts.
Dual independent OE# controls	Enables per-output power gating for ExpressCard slot arbitration and dynamic power management in multi-slot systems.
Configurable PLL bandwidth	Two discrete bandwidth settings allow optimization for either low-jitter clean-up (high BW) or robust spread-spectrum following (low BW).
HCSL output compliance	Meets PCIe Gen3 HCSL electrical requirements (0.7V CM, 300–1557 mV swing, <50 ps skew) without external termination or level-shifting components.
SMBus programmability	Allows in-system PLL mode selection, bandwidth adjustment, and status readback - eliminating need for strap resistors or firmware reflash.

Applications

PCIe Gen3 Server Backplane Clock Distribution	ExpressCard Slot Timing Management
Use Scenario: Distributing a single PCIe Gen3 reference clock from a main clock generator to eight downstream PCIe slots on a 2U server motherboard. IC Role / Device Role / Timing Role: Zero-delay fanout buffer that preserves phase integrity across all outputs while attenuating upstream jitter. Use Value: Enables simultaneous Gen3 link training across all slots with <1.0 ps RMS phase jitter - meeting PCI-SIG spec without requiring individual clock synthesizers per slot.	Use Scenario: Providing isolated, independently enabled clock outputs to three ExpressCard slots on a laptop docking station. IC Role / Device Role / Timing Role: Dual-output buffer with per-channel OE# control, allowing hot-plug detection and slot-specific clock gating. Use Value: Reduces system power by >15 mW per inactive slot and eliminates clock-related hot-plug glitches through synchronized OE# assertion/deassertion.
Storage Controller Reference Clock Fanout	Multi-Function PCIe Add-in Card Timing
Use Scenario: Driving reference clocks to NVMe SSD controllers, SAS HBAs, and PCIe switch ICs on a unified storage controller card. IC Role / Device Role / Timing Role: Low-skew HCSL buffer ensuring deterministic clock arrival across heterogeneous PCIe peripherals. Use Value: Maintains <50 ps output-to-output skew across all devices, preventing timing violations during high-throughput storage I/O bursts.	Use Scenario: Supplying synchronized clocks to GPU, network controller, and FPGA co-processor on a high-performance PCIe add-in card. IC Role / Device Role / Timing Role: Configurable PLL buffer supporting both jitter-cleaning (GPU) and bypass (FPGA) modes via SMBus. Use Value: Eliminates need for separate clock ICs - one 9DB233AGLFT serves mixed-jitter-sensitivity loads while maintaining PCIe Gen3 compliance for all endpoints.

PCIe Gen3 Server Backplane Clock Distribution

ExpressCard Slot Timing Management

Use Scenario: Distributing a single PCIe Gen3 reference clock from a main clock generator to eight downstream PCIe slots on a 2U server motherboard.

IC Role / Device Role / Timing Role: Zero-delay fanout buffer that preserves phase integrity across all outputs while attenuating upstream jitter.

Use Value: Enables simultaneous Gen3 link training across all slots with <1.0 ps RMS phase jitter - meeting PCI-SIG spec without requiring individual clock synthesizers per slot.

Use Scenario: Providing isolated, independently enabled clock outputs to three ExpressCard slots on a laptop docking station.

IC Role / Device Role / Timing Role: Dual-output buffer with per-channel OE# control, allowing hot-plug detection and slot-specific clock gating.

Use Value: Reduces system power by >15 mW per inactive slot and eliminates clock-related hot-plug glitches through synchronized OE# assertion/deassertion.

Storage Controller Reference Clock Fanout

Multi-Function PCIe Add-in Card Timing

Use Scenario: Driving reference clocks to NVMe SSD controllers, SAS HBAs, and PCIe switch ICs on a unified storage controller card.

IC Role / Device Role / Timing Role: Low-skew HCSL buffer ensuring deterministic clock arrival across heterogeneous PCIe peripherals.

Use Value: Maintains <50 ps output-to-output skew across all devices, preventing timing violations during high-throughput storage I/O bursts.

Use Scenario: Supplying synchronized clocks to GPU, network controller, and FPGA co-processor on a high-performance PCIe add-in card.

IC Role / Device Role / Timing Role: Configurable PLL buffer supporting both jitter-cleaning (GPU) and bypass (FPGA) modes via SMBus.

Use Value: Eliminates need for separate clock ICs - one 9DB233AGLFT serves mixed-jitter-sensitivity loads while maintaining PCIe Gen3 compliance for all endpoints.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen3 clock buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICS874003AGILF	Single-output HCSL buffer; no PLL, fixed bypass-only operation; lower current consumption (45 mA typ.)	Lacks SMBus control and dual OE#; suitable only for static, single-load fanout where jitter attenuation is not required.	Select when cost and power are prioritized over jitter reduction and dynamic control.
PI6C557-03LEX	Three-output LVDS/LVPECL/HCSL configurable buffer; includes internal termination; no SMBus interface; higher supply current (120 mA typ.)	Supports mixed signaling standards but lacks spread-spectrum tracking and per-output enable; requires external configuration resistors.	Select when multi-standard output flexibility outweighs PCIe-specific jitter optimization and ExpressCard control needs.

Compared with ICS874003AGILF and PI6C557-03LEX, the 9DB233AGLFT uniquely combines dual HCSL outputs, SMBus-programmable PLL bandwidth, spread-spectrum compatibility, and independent OE# control - making it the only option qualified for PCIe Gen3-compliant, dynamically managed clock distribution in ExpressCard and multi-slot server designs.

Availability

9DB233AGLFT is available at Aetrix Electronics and suitable for PCIe Gen3 server backplanes, ExpressCard docking stations, and storage controller cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 9DB233AGLFT 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 datacenter applications.

The 9DB233AGLFT belongs to Renesas' high-performance timing portfolio, designed specifically for PCIe Gen3–Gen5 clock distribution with emphasis on jitter attenuation, spread-spectrum compatibility, and system-level configurability via SMBus.

FAQ

What is the primary function of the 9DB233AGLFT in a PCIe Gen3 system?

The 9DB233AGLFT functions as a two-output, zero-delay differential buffer that distributes and cleans PCIe Gen3 reference clocks. It accepts a differential HCSL input, optionally attenuates jitter via its configurable PLL, and delivers two matched 0.7V HCSL outputs with <1.0 ps RMS phase jitter - directly meeting PCI-SIG Gen3 timing requirements for downstream endpoints.

How does the SMBus interface enhance system design flexibility for the 9DB233AGLFT?

The SMBus interface on the 9DB233AGLFT enables runtime configuration of PLL mode (bypass vs. enabled), PLL bandwidth selection (low vs. high), and diagnostic register reads - all without requiring hardware strapping or device reset. This allows dynamic adaptation to varying system conditions, such as enabling spread-spectrum tracking during EMI testing or switching to bypass mode for board-level validation.

What external components are required for proper operation of the 9DB233AGLFT?

The 9DB233AGLFT requires a precision 475Ω resistor connected between IREF (pin 18) and GND to set the 0.7V HCSL output common-mode voltage and drive strength. Additionally, each differential output pair must be terminated with 100Ω across DIF_x and DIF_x# at the load end. No external capacitors or biasing networks are needed for basic operation.

Can the 9DB233AGLFT support ExpressCard hot-plug functionality, and how is it implemented?

Yes, the 9DB233AGLFT supports ExpressCard hot-plug via its dual active-low OE# pins (vOE0# and vOE1#). Each pin has an internal 120 kΩ pull-down resistor, allowing direct connection to hot-plug detect signals. Asserting OE# disables the corresponding output pair within 1–3 clock cycles, preventing clock glitches during insertion/removal - a key requirement for ExpressCard compliance.

What is the significance of the "AGLFT" suffix in the 9DB233AGLFT part number?

The "AGLFT" suffix identifies the 9DB233AGLFT as a RoHS-compliant, tape-and-reel packaged variant in the 20-pin TSSOP (4.4 mm narrow body) package, rated for commercial temperature range (0°C to +70°C). "A" denotes revision level, "G" indicates TSSOP packaging, "LF" confirms lead-free/RoHS compliance, and "T" specifies tape-and-reel delivery format.

9DB233AGLFT Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: PCI Express (PCIe)

Input:: Clock

Output:: HCSL

Number of Circuits:: 1

Ratio - Input:Output:: 1:2

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 110MHz

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 20-TSSOP

9DB233AGLFT FAQ

1.How can I place an order for 9DB233AGLFT through Aetrix?

Please submit a Request for Quotation (RFQ) for 9DB233AGLFT 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 9DB233AGLFT reliable?

The price and inventory of 9DB233AGLFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 9DB233AGLFT is usually 5 days.

3.What payment methods are accepted for 9DB233AGLFT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 9DB233AGLFT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 9DB233AGLFT?

9DB233AGLFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 9DB233AGLFT 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 9DB233AGLFT?

For technical support, including 9DB233AGLFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 9DB233AGLFT requirements.

6.How does Aetrix verify that 9DB233AGLFT is sourced from the original manufacturer or authorized distributors?

All 9DB233AGLFT 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 9DB233AGLFT meets industry standards.

7.What is the process for return or replacement of 9DB233AGLFT?

All 9DB233AGLFT units undergo pre-shipment inspection (PSI). If there is an issue with 9DB233AGLFT, 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 9DB233AGLFT part is unused and in its original packaging.

Return procedure for 9DB233AGLFT:

1.Submit a request within 90 days.

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

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