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

Renesas RC19204AGNL#KB0

Name: RC19204AGNL#KB0
Brand: Renesas
SKU: RC19204AGNL#KB0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RC19204AGNL#KB0

Manufacturer:: Renesas

Category:: Application Specific Clock/Timing

Package:: 28-VFQFN Exposed Pad

Datasheet:: RC19204AGNL#KB0.pdf

Description:: VFQFPN 4.00X4.00X0.90 MM, 0.50MM

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RC19204AGNL#KB0 from Renesas Electronics is a 4-output ultra-low-jitter PCIe Gen5–7 clock multiplexer with dual differential inputs (CLKIN0/CLKINb0 and CLKIN1/CLKINb1), open-drain LOS output, and support for HCSL/LVDS input signaling. It delivers 7fs RMS PCIe Gen5 additive phase jitter, operates from 25MHz to 400MHz with Automatic Clock Parking enabled, and drives source- or double-terminated loads. It is used in high-speed server backplanes requiring redundant clock switching and loss-of-signal monitoring.

For engineers reviewing the RC19204AGNL#KB0 datasheet, RC19204AGNL#KB0 pinout, RC19204AGNL#KB0 application, or RC19204AGNL#KB0 equivalent, key selection criteria include PCIe Gen5–7 jitter compliance, dual-input redundancy with MUX logic (0/1/M mode), 28-pin 4×4 mm VFQFPN package, 85Ω/100Ω selectable output impedance, and Power Down Tolerance on critical control pins.

Technical Context

The RC19204AGNL#KB0 implements a 2:4 differential clock mux with two independent banks (Bank 0 and Bank 1), each supporting configurable input routing via CLKSEL_tri (0 = CLKIN0 only; 1 = CLKIN1 only; M = CLKIN0→Bank 0 / CLKIN1→Bank 1). It integrates dedicated circuitry for Loss-of-Signal detection and Automatic Clock Parking to force outputs low/low upon input failure.

Its architecture supports Flexible Power Sequencing: PWRGD_PWRDNb enables startup sequencing independent of power rail ramp rates, while Power Down Tolerance allows CLKIN, OEb, and SBI pins to remain driven during VDD absence. The device uses LP-HCSL outputs with programmable 85Ω or 100Ω termination via ZOUTSEL.

Key Specifications

Parameter	Value and Actual Design Meaning
PCIe Gen5 additive phase jitter	7fs RMS - meets PCIe Gen5 specification for switch/router reference clocks.
PCIe Gen6 additive phase jitter	4fs RMS - exceeds Gen6 jitter budget for next-gen AI accelerator interconnects.
PCIe Gen7 additive phase jitter	3fs RMS - validated for future 128 GT/s serial link timing margins.
Output frequency range (ACP enabled)	25MHz–400MHz - supports full PCIe Gen5–7 data rates with automatic parking.
Output impedance selection	85Ω or 100Ω via ZOUTSEL pin - matches common PCB trace impedances without external resistors.
LOS output type	Open-drain, PDT - enables direct connection to 3.3V system fault bus with external pull-up.
Input signaling compatibility	HCSL or LVDS on CLKIN0/CLKINb0 and CLKIN1/CLKINb1 - eliminates level-shifter ICs in mixed-signal clock trees.

Pinout & Package

RC19204AGNL#KB0 is housed in a 28-pin 4.0 mm × 4.0 mm × 0.85 mm VFQFPN package with exposed thermal pad (EPAD) connected to GNDSUB. Pin count and layout match Renesas' standardized 28-VFQFPN footprint for RC19202/RC19204 family members.

Pin/Terminal	Circuit Role	Design Meaning
1	PWRGD_PWRDNb	Power-good/power-down control input with internal PU - initiates startup sequence or enters low-power mode without external logic.
2, 3	CLKIN0 / CLKINb0	Differential true/complement input pair - accepts HCSL or LVDS signals; tolerant of floating or unpowered states.
4	VDDIN0	3.3V supply for input buffer bank - decoupled separately to suppress coupling into clock path.
5, 6	CLKIN1 / CLKINb1	Second differential input pair - enables redundant clock sourcing with independent termination and biasing.
7	VDDIN1	3.3V supply for second input buffer bank - isolates noise between primary and backup clock domains.
8	CLKSEL_tri	Tri-level select input (0/1/M) - configures input routing per bank without I²C/SMBus overhead.
9, 16, 19	OEb_G / OEb_F / OEb_C	Active-low output enable pins - individually disable output groups (G/F/C) to reduce dynamic power or isolate failed lanes.
10, 11, 13, 14	CLK12 / CLKb12 / CLK10 / CLKB10	Differential output pairs - deliver LP-HCSL clocks with matched skew (<10ps) across all four outputs.
17	LOSb	Open-drain loss-of-signal indicator - asserts low when either input clock fails detection threshold for >1ms.
18, 20, 21	VDDA / CLK5 / CLKb5	Analog supply / remaining output pair - VDDA powers internal PLL and jitter cleanup circuitry; CLK5/CLKb5 complete 4-output set.

Key Features

Feature	Design Value
Automatic Clock Parking (ACP)	Drives all outputs to defined low/low state within 100ns of input loss - prevents metastability in downstream SerDes receivers.
Flexible Power Sequencing (FPS)	Accepts CLKIN and control signals before VDD stabilization - eliminates need for sequenced power supplies in multi-rail systems.
Power Down Tolerance (PDT)	CLKIN, OEb, and PWRGD_PWRDNb pins tolerate 3.3V drive with VDD = 0V - enables hot-plug and graceful shutdown.
LVDS-to-HCSL level translation	Direct interface to LVDS oscillators or FPGA outputs without external level shifters - reduces BOM count and signal integrity risk.
Selectable 85Ω/100Ω output impedance	ZOUTSEL pin configures on-die termination to match PCB stackup - eliminates discrete 33Ω/47Ω resistor networks per output pair.

Applications

PCIe Gen5 Server Backplane	nVME Storage Controller
Use Scenario: Redundant reference clock distribution across 16-lane PCIe Gen5 switch ASIC with failover to secondary oscillator. IC Role / Device Role / Timing Role: Dual-input clock mux providing glitch-free switching and real-time LOS monitoring for system health management. Use Value: 7fs Gen5 jitter ensures <1e-12 BER at 32 GT/s; ACP prevents receiver lockup during switchover; PDT simplifies power sequencing with hot-swap PSUs.	Use Scenario: Clock fanout from single PCIe Gen5 oscillator to multiple NVMe SSD controllers and host CPU interfaces. IC Role / Device Role / Timing Role: Low-skew 4-output clock buffer with independent output enables for per-device power gating. Use Value: 4fs Gen6 jitter headroom accommodates board-level jitter accumulation; 85Ω output matches typical FR4 trace impedance; ZOUTSEL eliminates layout rework.
AI Accelerator Rack Interconnect	Cloud Data Center Switch Fabric
Use Scenario: Synchronizing multiple GPU/CPU clusters using shared reference clock with automatic parking on link failure. IC Role / Device Role / Timing Role: High-reliability clock mux enabling deterministic recovery from transient input faults in multi-chip modules. Use Value: 3fs Gen7 jitter margin supports future 64 GT/s links; LOSb feeds FPGA-based fault isolation logic; FPS allows clock delivery before core rails stabilize.	Use Scenario: Driving clock inputs of 4x 400G Ethernet PHYs and packet processor SoCs from dual-redundant OCXOs. IC Role / Device Role / Timing Role: Ultra-low-noise clock distribution hub with independent bank routing (M-mode) for isolated timing domains. Use Value: Dual-bank architecture avoids crosstalk between fabric and control-plane clocks; 12kHz–20MHz integrated jitter = 37fs RMS at 156.25MHz supports SyncE compliance.

PCIe Gen5 Server Backplane

nVME Storage Controller

Use Scenario: Redundant reference clock distribution across 16-lane PCIe Gen5 switch ASIC with failover to secondary oscillator.

IC Role / Device Role / Timing Role: Dual-input clock mux providing glitch-free switching and real-time LOS monitoring for system health management.

Use Value: 7fs Gen5 jitter ensures <1e-12 BER at 32 GT/s; ACP prevents receiver lockup during switchover; PDT simplifies power sequencing with hot-swap PSUs.

Use Scenario: Clock fanout from single PCIe Gen5 oscillator to multiple NVMe SSD controllers and host CPU interfaces.

IC Role / Device Role / Timing Role: Low-skew 4-output clock buffer with independent output enables for per-device power gating.

Use Value: 4fs Gen6 jitter headroom accommodates board-level jitter accumulation; 85Ω output matches typical FR4 trace impedance; ZOUTSEL eliminates layout rework.

AI Accelerator Rack Interconnect

Cloud Data Center Switch Fabric

Use Scenario: Synchronizing multiple GPU/CPU clusters using shared reference clock with automatic parking on link failure.

IC Role / Device Role / Timing Role: High-reliability clock mux enabling deterministic recovery from transient input faults in multi-chip modules.

Use Value: 3fs Gen7 jitter margin supports future 64 GT/s links; LOSb feeds FPGA-based fault isolation logic; FPS allows clock delivery before core rails stabilize.

Use Scenario: Driving clock inputs of 4x 400G Ethernet PHYs and packet processor SoCs from dual-redundant OCXOs.

IC Role / Device Role / Timing Role: Ultra-low-noise clock distribution hub with independent bank routing (M-mode) for isolated timing domains.

Use Value: Dual-bank architecture avoids crosstalk between fabric and control-plane clocks; 12kHz–20MHz integrated jitter = 37fs RMS at 156.25MHz supports SyncE compliance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT8T49N242A	4-output, PCIe Gen4-compliant (100fs RMS), no ACP or LOS, 32-QFN	Lacks automatic clock parking and loss-of-signal reporting; requires external monitoring circuitry	Choose for cost-sensitive Gen4 systems where fault resilience is managed at system level.
Si5332A-D-GM	4-output, software-programmable jitter cleaner, 6-output variants available, 4×4 mm QFN	Requires SMBus configuration; higher power; adds jitter cleaning but no native dual-input mux logic	Choose when dynamic frequency synthesis or jitter attenuation beyond mux function is required.

Compared with IDT8T49N242A and Si5332A-D-GM, RC19204AGNL#KB0 uniquely combines PCIe Gen5–7 jitter performance, hardware-based dual-input redundancy, and autonomous fault response (ACP + LOSb) in a pin-strapped 28-VFQFPN - eliminating firmware dependencies and reducing system-level validation effort.

Availability

RC19204AGNL#KB0 is available at Aetrix Electronics and suitable for PCIe Gen5 server backplanes, nVME storage controllers, AI accelerator interconnects, and cloud switch fabrics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for RC19204AGNL#KB0 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and datacenter applications.

The RC192xx family was designed specifically for PCIe Gen5–7 infrastructure, addressing stringent jitter, redundancy, and power sequencing requirements in high-performance computing and networking systems.

FAQ

What is the maximum operating frequency of RC19204AGNL#KB0 with Automatic Clock Parking enabled?

The RC19204AGNL#KB0 supports operation from 25MHz to 400MHz when Automatic Clock Parking is enabled. This range covers all standard PCIe reference frequencies (100MHz, 125MHz, 156.25MHz) and extends to 400MHz for emerging high-speed interconnects. The device maintains sub-10ps output skew across this full band.

Does RC19204AGNL#KB0 require external configuration to operate as a clock mux?

No, RC19204AGNL#KB0 operates as a fully functional clock mux without external configuration. Input selection (CLKIN0/CLKIN1) is controlled by the hardware-pin CLKSEL_tri, and output impedance is set by ZOUTSEL. SMBus is optional and unused in basic mux mode, making RC19204AGNL#KB0 truly plug-and-play for fixed-function deployments.

How does the Loss-of-Signal (LOSb) output behave during power-down mode?

During power-down mode (triggered by low assertion on PWRGD_PWRDNb), the LOSb pin remains functional and retains its open-drain, Power Down Tolerant behavior. It continues to monitor input clocks and assert low if signal loss is detected - enabling system-level fault logging even when the device's core logic is inactive.

Can RC19204AGNL#KB0 drive both source-terminated and double-terminated transmission lines?

Yes, RC19204AGNL#KB0 is explicitly characterized to drive both source-terminated (e.g., 33Ω series resistor + 50Ω trace) and double-terminated (e.g., 100Ω differential pair with 50Ω shunt terminations) loads up to 400MHz. Its LP-HCSL outputs deliver consistent edge rates and amplitude across both topologies without external tuning.

What package variant corresponds to the RC19204AGNL#KB0 part number?

RC19204AGNL#KB0 uses the 28-pin 4.0 mm × 4.0 mm Very Thin Quad Flat No-lead (VFQFPN) package with wettable flank leads and an exposed thermal pad (EPAD). This package is identical to the one used for RC19202 and shares footprint compatibility across the RC19202/RC19204 family for design reuse.

RC19204AGNL#KB0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 28-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

PLL:: No

Main Purpose:: PCI Express (PCIe)

Input:: HCSL, LVDS

Output:: LP-HCSL

Number of Circuits:: 1

Ratio - Input:Output:: 2:4

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 400MHz

Voltage - Supply:: 2.97V ~ 3.63V

Operating Temperature:: -40°C ~ 105°C (TA)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 28-VFQFPN (4x4)

RC19204AGNL#KB0 FAQ

1.How can I place an order for RC19204AGNL#KB0 through Aetrix?

Please submit a Request for Quotation (RFQ) for RC19204AGNL#KB0 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 RC19204AGNL#KB0 reliable?

The price and inventory of RC19204AGNL#KB0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RC19204AGNL#KB0 is usually 5 days.

3.What payment methods are accepted for RC19204AGNL#KB0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RC19204AGNL#KB0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RC19204AGNL#KB0?

RC19204AGNL#KB0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RC19204AGNL#KB0 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 RC19204AGNL#KB0?

For technical support, including RC19204AGNL#KB0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RC19204AGNL#KB0 requirements.

6.How does Aetrix verify that RC19204AGNL#KB0 is sourced from the original manufacturer or authorized distributors?

All RC19204AGNL#KB0 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 RC19204AGNL#KB0 meets industry standards.

7.What is the process for return or replacement of RC19204AGNL#KB0?

All RC19204AGNL#KB0 units undergo pre-shipment inspection (PSI). If there is an issue with RC19204AGNL#KB0, 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 RC19204AGNL#KB0 part is unused and in its original packaging.

Return procedure for RC19204AGNL#KB0:

1.Submit a request within 90 days.

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

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