CDCDB803ERSLR - 8-Output PCIe Clock Buffer | Texas Instruments
N.º de pieza: CDCDB803ERSLR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.5 | $4,50 |
| 10 | $4.05 | $40,50 |
| 100 | $3.6 | $360,00 |
| 500 | $3.24 | $1.620,00 |
| 1.000 | $2.88 | $2.880,00 |
CDCDB803ERSLR Descripción general
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.
Alternativas directas para CDCDB803ERSLR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
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CDCDB803ERSLR Especificaciones
| Type | Clock Buffer |
| Número de salidas | 8 |
| Input:Output Ratio | 1:8 |
| Maximum Frequency | 250 MHz |
| Output Logic | LP-HCSL |
| Input Logic | HCSL |
| Tensión de alimentación | 3.3 V |
| Encapsulado | 48-VFQFN (6x6 mm) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +85C |
| Interfaz | SMBus |
| Output Enable | 8 individual pins |
| Compliance | DB800ZL, DB2000Q |
| RoHS | Compliant |
| Applications | PCIe Gen 1-6, QPI, UPI, SAS, SATA |
Configuración de pines de CDCDB803ERSLR
| Pin 1 | OUT0 — Output 0 |
| Pin 2 | OUT0# — Complementary output 0 |
| Pin 3 | VDD — Power supply |
| Pin 4 | GND — Ground |
| Pin 5 | OUT1 — Output 1 |
| Pin 6 | OUT1# — Complementary output 1 |
| Pin 7 | VDD — Power supply |
| Pin 8 | GND — Ground |
| Pin 9 | OUT2 — Output 2 |
| Pin 10 | OUT2# — Complementary output 2 |
| Pin 11 | VDD — Power supply |
| Pin 12 | GND — Ground |
| Pin 13 | OUT3 — Output 3 |
| Pin 14 | OUT3# — Complementary output 3 |
| Pin 15 | VDD — Power supply |
| Pin 16 | GND — Ground |
| Pin 17 | OUT4 — Output 4 |
| Pin 18 | OUT4# — Complementary output 4 |
| Pin 19 | VDD — Power supply |
| Pin 20 | GND — Ground |
| Pin 21 | OUT5 — Output 5 |
| Pin 22 | OUT5# — Complementary output 5 |
| Pin 23 | VDD — Power supply |
| Pin 24 | GND — Ground |
| Pin 25 | OUT6 — Output 6 |
| Pin 26 | OUT6# — Complementary output 6 |
| Pin 27 | VDD — Power supply |
| Pin 28 | GND — Ground |
| Pin 29 | OUT7 — Output 7 |
| Pin 30 | OUT7# — Complementary output 7 |
| Pin 31 | VDD — Power supply |
| Pin 32 | GND — Ground |
| Pin 33 | SMB_CLK — SMBus clock |
| Pin 34 | SMB_DAT — SMBus data |
| Pin 35 | OE0 — Output enable 0 |
| Pin 36 | OE1 — Output enable 1 |
| Pin 37 | OE2 — Output enable 2 |
| Pin 38 | OE3 — Output enable 3 |
| Pin 39 | OE4 — Output enable 4 |
| Pin 40 | OE5 — Output enable 5 |
| Pin 41 | OE6 — Output enable 6 |
| Pin 42 | OE7 — Output enable 7 |
| Pin 43 | CLKIN — Input clock |
| Pin 44 | CLKIN# — Complementary input clock |
| Pin 45 | VDD — Power supply |
| Pin 46 | GND — Ground |
| Pin 47 | NC — No connect |
| Pin 48 | NC — No connect |
Aplicaciones típicas
CDCDB803ERSLR es adecuado para 6 aplicacións: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CDCDB803ERSLR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | 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 |
Diferenciadores clave
- DB800ZL and DB2000Q compliance (frente a PI6C557-03B)
- SMBus interface and individual output enables (frente a PI6C557-03B)
- Support for PCIe Gen 6 (frente a 9DB803)
Notas de diseño
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.
Información de cumplimiento
RoHS compliant per JLCPCB. Other compliance data not specified in provided sources.
