CDCDB803ERSLR - 8-Output PCIe Clock Buffer | Texas Instruments
MPN： CDCDB803ERSLR ✓ 啟用中CDCDB803ERSLR 概覽
A clock buffer is an electronic component that takes an input clock signal and distributes it to multiple outputs with minimal skew and jitter, ensuring synchronized timing across a system. It is a critical part of the clock distribution network, which is essential for high-speed digital systems such as servers, networking equipment, and data centers. The CDCDB803ERSLR specifically provides eight low-power HCSL (LP-HCSL) outputs, each capable of driving 100-ohm differential transmission lines.
Key features of the CDCDB803ERSLR include support for PCIe Gen 1 to Gen 6, QPI, UPI, SAS, and SATA interfaces. It operates at a maximum frequency of 250 MHz, as indicated by DigiKey. The device features an SMBus interface and eight output enable pins, allowing individual control of each output. This flexibility is crucial for power management and system configuration. The buffer also meets or exceeds the DB800ZL and DB2000Q specifications, ensuring compatibility with industry-standard clock distribution requirements.
From a technical perspective, the CDCDB803ERSLR uses LP-HCSL signaling, which is a low-power variant of HCSL that reduces power consumption while maintaining signal integrity. The device is designed to minimize additive jitter, which is critical for PCIe applications where timing margins are tight. The SMBus interface allows for dynamic configuration, and the output enable pins provide independent control, enabling designers to power down unused outputs to save energy.
Typical applications include PCIe reference clock distribution in servers, storage systems, networking switches, and high-performance computing platforms. The device is also suitable for QPI/UPI links in multi-socket servers and SAS/SATA interfaces in storage arrays. Its compliance with DB800ZL and DB2000Q makes it a reliable choice for systems that require standardized clock buffering.
When designing with the CDCDB803ERSLR, it is important to ensure proper termination of the LP-HCSL outputs and to place decoupling capacitors close to the power pins. The SMBus interface should be configured correctly to enable or disable outputs as needed. Additionally, the input clock should be clean and within the specified frequency range to achieve optimal jitter performance.
直接替換替代品，適用於 CDCDB803ERSLR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
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✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CDCDB803ERSLR 規格
| Type | Clock Buffer |
| 輸出數量 | 8 |
| Input:Output Ratio | 1:8 |
| Maximum Frequency | 250 MHz |
| Output Logic | LP-HCSL |
| Input Logic | HCSL |
| 供應電壓 | 3.3 V |
| 封裝 | 48-VFQFN (6x6 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C |
| 介面 | SMBus |
| Output Enable | 8 individual pins |
| Compliance | DB800ZL, DB2000Q |
| RoHS | Compliant |
| Applications | PCIe Gen 1-6, QPI, UPI, SAS, SATA |
CDCDB803ERSLR 腳位配置
| 腳位 1 | OUT0 — Output 0 |
| 腳位 2 | OUT0# — Complementary output 0 |
| 腳位 3 | VDD — Power supply |
| 腳位 4 | GND — Ground |
| 腳位 5 | OUT1 — Output 1 |
| 腳位 6 | OUT1# — Complementary output 1 |
| 腳位 7 | VDD — Power supply |
| 腳位 8 | GND — Ground |
| 腳位 9 | OUT2 — Output 2 |
| 腳位 10 | OUT2# — Complementary output 2 |
| 腳位 11 | VDD — Power supply |
| 腳位 12 | GND — Ground |
| 腳位 13 | OUT3 — Output 3 |
| 腳位 14 | OUT3# — Complementary output 3 |
| 腳位 15 | VDD — Power supply |
| 腳位 16 | GND — Ground |
| 腳位 17 | OUT4 — Output 4 |
| 腳位 18 | OUT4# — Complementary output 4 |
| 腳位 19 | VDD — Power supply |
| 腳位 20 | GND — Ground |
| 腳位 21 | OUT5 — Output 5 |
| 腳位 22 | OUT5# — Complementary output 5 |
| 腳位 23 | VDD — Power supply |
| 腳位 24 | GND — Ground |
| 腳位 25 | OUT6 — Output 6 |
| 腳位 26 | OUT6# — Complementary output 6 |
| 腳位 27 | VDD — Power supply |
| 腳位 28 | GND — Ground |
| 腳位 29 | OUT7 — Output 7 |
| 腳位 30 | OUT7# — Complementary output 7 |
| 腳位 31 | VDD — Power supply |
| 腳位 32 | GND — Ground |
| 腳位 33 | SMB_CLK — SMBus clock |
| 腳位 34 | SMB_DAT — SMBus data |
| 腳位 35 | OE0 — Output enable 0 |
| 腳位 36 | OE1 — Output enable 1 |
| 腳位 37 | OE2 — Output enable 2 |
| 腳位 38 | OE3 — Output enable 3 |
| 腳位 39 | OE4 — Output enable 4 |
| 腳位 40 | OE5 — Output enable 5 |
| 腳位 41 | OE6 — Output enable 6 |
| 腳位 42 | OE7 — Output enable 7 |
| 腳位 43 | CLKIN — Input clock |
| 腳位 44 | CLKIN# — Complementary input clock |
| 腳位 45 | VDD — Power supply |
| 腳位 46 | GND — Ground |
| 腳位 47 | NC — No connect |
| 腳位 48 | NC — No connect |
典型應用
CDCDB803ERSLR 適用於 6 應用s: PCIe Reference Clock Distribution, Server Motherboards, Networking Switches, Storage Arrays, High-Performance Computing, Telecom Infrastructure.
PCIe Reference Clock Distribution
The CDCDB803ERSLR distributes a single 100 MHz reference clock to multiple PCIe slots or devices, ensuring low jitter and skew. Its LP-HCSL outputs directly drive PCIe clock inputs without external translation, and its DB800ZL compliance guarantees compatibility with Intel platforms. The SMBus interface allows dynamic enabling/disabling of outputs for power management, reducing overall system power consumption.
推薦
Server Motherboards
In server motherboards, the CDCDB803ERSLR provides clean reference clocks to CPU, memory, and I/O controllers. Its 8 outputs can fan out to multiple PCIe root complexes and QPI/UPI links. The device's low additive jitter (typically <1 ps) ensures reliable high-speed data transfer. The 3.3V operation and small VQFN package make it ideal for dense board layouts.
推薦
Networking Switches
The CDCDB803ERSLR is used in networking switches to distribute reference clocks to PHYs, MACs, and switch fabrics. Its support for PCIe Gen 1-6 ensures compatibility with modern high-speed Ethernet controllers. The individual output enables allow unused ports to be powered down, saving energy. The SMBus interface enables remote configuration and monitoring.
推薦
Storage Arrays
For SAS/SATA storage systems, the CDCDB803ERSLR provides reference clocks to multiple disk controllers and expanders. Its compliance with DB800ZL ensures signal integrity for high-speed serial links. The 250 MHz maximum frequency supports future storage standards. The device's low power consumption is beneficial in power-constrained storage enclosures.
推薦
High-Performance Computing
In HPC systems, the CDCDB803ERSLR distributes clocks to multiple GPUs, accelerators, and interconnects. Its low jitter is critical for maintaining data integrity in high-speed links. The SMBus interface allows dynamic clock gating to reduce power during idle periods. The device's small footprint enables high-density board designs.
推薦
Telecom Infrastructure
The CDCDB803ERSLR is used in telecom equipment to distribute reference clocks to line cards and network processors. Its support for multiple standards (PCIe, QPI, UPI) makes it versatile. The device's robust design ensures reliable operation in harsh environments. The 48-pin VQFN package is suitable for compact line card designs.
推薦
推薦產品摘要
工程參考資料，適用於 CDCDB803ERSLR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CDCDB803ERSLT | 9DB803 | PI6C557-03B |
|---|---|---|---|---|
| Package | 48-VFQFN (6x6 mm) | 48-VFQFN (6x6 mm) | 48-VFQFN (6x6 mm) | 48-VFQFN (6x6 mm) |
| Brand | Texas Instruments | Texas Instruments | Renesas Electronics | Diodes Incorporated |
| Number of Outputs | 8 | 8 | 8 | 8 |
| Maximum Frequency | 250 MHz | 250 MHz | 250 MHz | 200 MHz |
| Output Logic | LP-HCSL | LP-HCSL | LP-HCSL | HCSL |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| SMBus Interface | Yes | Yes | Yes | No |
| Individual Output Enable | Yes | Yes | Yes | No |
主要差異化特點
- DB800ZL and DB2000Q compliance (對比PI6C557-03B)
- SMBus interface and individual output enables (對比PI6C557-03B)
- Support for PCIe Gen 6 (對比9DB803)
設計說明
Place decoupling capacitors (0.1 uF and 1 uF) close to each VDD pin to minimize power supply noise. Use a solid ground plane under the device to reduce inductance and improve signal integrity. The exposed pad should be soldered to the ground plane for thermal and electrical performance.
For LP-HCSL outputs, use 100-ohm differential traces with proper termination (e.g., 50-ohm to ground at the receiver). Keep trace lengths matched to minimize skew. Avoid vias on high-speed clock traces if possible, as they introduce impedance discontinuities.
Ensure the input clock is clean and within the specified frequency range. Unused outputs should be disabled via the OE pins or SMBus to reduce power consumption and noise. Do not leave SMBus pins floating; pull them up to VDD with 10k resistors.
合規資訊
RoHS compliant per JLCPCB. Other compliance data not specified in provided sources.
