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Renesas HXT14450-DNU
- Part No.:
- HXT14450-DNU
- Manufacturer:
- Renesas
- Category:
- Laser Drivers
- Package:
- -
- Datasheet:
-
HXT14450-DNU.pdf
- Description:
- DIE SALE (PRICE IN GOOD DIE)-WAF
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Product details
Overview
HXT14450-DNU from Renesas is a quad-channel linear PAM4 VCSEL driver IC with integrated CDR, designed for 200G SR4 and 400G SR8 optical interconnects in QSFP56/QSFP-DD modules. It delivers 56Gbps per channel, supports up to 11mA VCSEL modulation current, consumes 490mW/channel, and operates across –5°C to +95°C.
For engineers reviewing the HXT14450-DNU datasheet, HXT14450-DNU pinout, HXT14450-DNU application, or HXT14450-DNU equivalent, key selection criteria include PAM4 CDR latency, auto-adaptive CTLE/DFE equalization, I²C programmable IMOD/IBIAS control, and compatibility with CEI-56G-VSR-PAM4 signaling standards.
Technical Context
The HXT14450-DNU implements a low-latency clock and data recovery (CDR) block per channel, supporting both reference-less and external reference clock modes. Its analog front-end includes programmable 8-bit IMOD and IBIAS controls, polarity inversion, and TX disable with LOS detection.
It integrates on-die testability features including PRBS7/PRBS13/PRBS31 generators, error checkers, eye opening monitor (EOM), and jitter tolerance (JTOL) measurement - all accessible via I²C interface in standard and fast modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 56 Gbps per channel, enabling 200G-SR4 and 400G-SR8 Ethernet compliance |
| Modulation Format | PAM4 signaling, meeting CEI-56G-VSR-PAM4 electrical specification |
| VCSEL Drive Current | Up to 11 mA modulation current, sufficient for high-efficiency multimode VCSEL arrays |
| Power Consumption | 490 mW per channel typical, critical for thermal management in dense QSFP modules |
| Operating Temp | –5°C to +95°C junction temperature range, validated for industrial-grade optical module operation |
| Equalization | Auto-adaptive CTLE + DFE, enabling robust signal integrity over chip-to-module interconnects |
| I²C Interface | Standard (100 kHz) and fast mode (400 kHz), allowing real-time configuration and diagnostics |
Pinout & Package
Package: Die form, dimensions 3320.1 × 1265.4 μm, intended for flip-chip assembly into optical subassemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD_TX | Core supply rail | 1.8 V analog supply for VCSEL driver output stage; requires local decoupling |
| VDD_CDR | CDR supply rail | 1.2 V supply dedicated to low-jitter CDR circuitry; isolated from digital domains |
| REFCLK_IN | Reference clock input | Accepts 28 GHz differential reference for synchronous CDR lock; optional in reference-less mode |
| TXP/TXN (×4) | Differential PAM4 output | Four pairs driving VCSEL anodes/cathodes; supports polarity inversion and de-emphasis programming |
| SCL/SDA | I²C control interface | Two-wire serial bus for configuring IMOD/IBIAS, equalizer settings, and test modes |
| LOS_OUT | Loss-of-signal indicator | Open-drain output asserting when input signal falls below JTOL threshold; programmable hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CDR per channel | Enables retiming of degraded PAM4 signals without external clock distribution, reducing jitter accumulation |
| Auto-adaptive CTLE + DFE | Compensates for frequency-dependent loss in FR4 traces and fiber modal dispersion without manual tuning |
| On-chip PRBS generator & error checker | Supports loopback BER testing at full 56Gbps rate without external test equipment |
| Programmable TX test patterns | Allows generation of custom patterns (e.g., PRBS7, PRBS13) for channel characterization and compliance validation |
| Integrated temperature sensor | Provides real-time die temperature feedback for dynamic bias adjustment and thermal derating |
Applications
| 200G QSFP56 SR4 Modules | 400G QSFP-DD SR8 Modules |
|---|---|
Use Scenario: High-density top-of-rack switch interconnects within hyperscale data centers using OM4 MMF. IC Role / Device Role / Timing Role: Quad-channel PAM4 VCSEL driver with embedded CDR, providing precise current-mode drive and signal retiming. Use Value: Enables 200G per port at <1.5 W total module power while maintaining IEEE 802.3cd SR4 link budget margins. | Use Scenario: Spine-leaf architecture links requiring 400G connectivity over short-reach multimode fiber. IC Role / Device Role / Timing Role: One HXT14450-DNU drives four VCSEL lanes; paired with HXR14450 receiver for full duplex operation. Use Value: Eliminates need for discrete CDRs and reduces PCB area by 35% versus discrete driver+CDR solutions. |
| 400G OBO Optical Engine | CEI-56G-VSR-PAM4 Interposer Links |
Use Scenario: Co-packaged optics integration where driver die is mounted directly on optical engine substrate. IC Role / Device Role / Timing Role: Bare-die VCSEL driver with flip-chip I/O, optimized for minimal bond wire inductance and thermal resistance. Use Value: Achieves >28 dB extinction ratio at 56Gbps with <0.3 UI jitter, meeting OBO MSA optical launch requirements. | Use Scenario: Chiplet-based AI accelerators using silicon interposers for die-to-die optical I/O. IC Role / Device Role / Timing Role: Electrical-to-optical conversion node with adaptive equalization for lossy 25 mm FR4 interposer traces. Use Value: Compensates up to 18 dB insertion loss at Nyquist frequency, enabling reliable PAM4 signaling across heterogeneous chiplets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PAM4 VCSEL driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3945AETL+ | Single-channel, 53Gbps NRZ-only; no integrated CDR or PAM4 support | Limited to 100G SR1; not suitable for 200G/400G PAM4 systems | Select only for legacy NRZ-based 100G designs requiring minimal footprint |
| TI TLK2223IRHBR | Quad-channel 56Gbps PAM4 CDR-only; no VCSEL drive capability | Requires external driver stage; increases BOM count and layout complexity | Choose when existing driver architecture must be retained and only retiming is needed |
Compared with MAX3945AETL+ and TLK2223IRHBR, the HXT14450-DNU uniquely integrates full PAM4 VCSEL drive + CDR in one die, eliminating inter-stage interfaces and reducing total solution power by ≥22% in 400G SR8 modules.
Availability
HXT14450-DNU is available at Aetrix Electronics and suitable for 200G QSFP56 SR4 modules, 400G QSFP-DD SR8 transceivers, and OBO optical engines requiring stable component supply under industrial temperature conditions.
Supply support for HXT14450-DNU 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 SoC products for automotive, industrial, infrastructure, and datacenter applications.
The HXT14450-DNU belongs to Renesas' high-speed optical interconnect product line, engineered specifically for compact, low-power, PAM4-based short-reach optical modules targeting next-generation AI/ML cluster interconnects.
FAQ
What is the operating temperature range specified for the HXT14450-DNU?
The HXT14450-DNU is rated for junction operation from –5°C to +95°C, validated for use in industrial-grade optical modules deployed in data center switching environments. This range supports reliable performance in QSFP56 and QSFP-DD form factors where ambient temperatures may exceed commercial limits. The integrated temperature sensor enables closed-loop bias calibration across this full range.
Does the HXT14450-DNU support both reference clock and reference-less CDR modes?
Yes, the HXT14450-DNU supports dual CDR operating modes: it can lock to an external 28 GHz differential REFCLK_IN or operate in reference-less mode using its internal oscillator. This flexibility simplifies system clock architecture in modular optical designs and reduces dependency on high-frequency clock distribution networks. Both modes maintain sub-0.3 UI RMS jitter at 56Gbps PAM4.
How is VCSEL bias and modulation current controlled on the HXT14450-DNU?
The HXT14450-DNU provides independent 8-bit programmable control for both IBIAS (DC bias current) and IMOD (AC modulation current) per channel via its I²C interface. This allows fine-grained optimization of extinction ratio and optical power across process, voltage, and temperature variations. Typical IMOD range extends to 11 mA, supporting high-efficiency 850 nm VCSEL arrays used in SR4/SR8 applications.
Can the HXT14450-DNU be used without the HXR14450 receiver?
Yes, the HXT14450-DNU functions independently as a standalone PAM4 VCSEL driver with CDR. While it is designed to pair with the HXR14450 TIA+CDR for balanced quad-channel modules, it does not require the companion receiver. Its CDR output can feed other logic or be monitored directly, and its PRBS generator/error checker supports autonomous link testing without receiver involvement.
What testability features are integrated into the HXT14450-DNU?
The HXT14450-DNU includes on-die testability features accessible via I²C: PRBS7/13/31 pattern generation, bit-error-rate (BER) checking, eye opening monitor (EOM), and jitter tolerance (JTOL) measurement. These enable production-level validation and field diagnostics at full 56Gbps PAM4 rates without external BERT equipment. All test functions operate synchronously with the CDR's recovered clock domain.
HXT14450-DNU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- -
- Data Rate:
- -
- Number of Channels:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Current - Modulation:
- -
- Current - Bias:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
HXT14450-DNU FAQ
1.How can I place an order for HXT14450-DNU through Aetrix?
Please submit a Request for Quotation (RFQ) for HXT14450-DNU 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 HXT14450-DNU reliable?
The price and inventory of HXT14450-DNU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HXT14450-DNU is usually 5 days.
3.What payment methods are accepted for HXT14450-DNU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HXT14450-DNU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HXT14450-DNU?
HXT14450-DNU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HXT14450-DNU 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 HXT14450-DNU?
For technical support, including HXT14450-DNU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HXT14450-DNU requirements.
6.How does Aetrix verify that HXT14450-DNU is sourced from the original manufacturer or authorized distributors?
All HXT14450-DNU 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 HXT14450-DNU meets industry standards.
7.What is the process for return or replacement of HXT14450-DNU?
All HXT14450-DNU units undergo pre-shipment inspection (PSI). If there is an issue with HXT14450-DNU, 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 HXT14450-DNU part is unused and in its original packaging.
Return procedure for HXT14450-DNU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HXT14450-DNU Tags
-
EPC21701
EPC
-
EPC21601
EPC
-
MAX3799ETJ+T
Analog Devices Inc./Maxim Integrated
-
AD9665ACPZ-REEL7
Analog Devices Inc.
-
MAX3740AETG+T
Analog Devices Inc./Maxim Integrated
-
MAX3795ETG+
Analog Devices Inc./Maxim Integrated
-
EPC21603
EPC
-
ONET8501VRGPT
Texas Instruments
-
MAX3738ETG+T
Analog Devices Inc./Maxim Integrated
-
SY88022ALMG-TR
Microchip Technology
-
ISL78365ARZ-T7A
Renesas
-
EPC21603ENGRT
EPC
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