CDCDB803ERSLR - 8-Output PCIe Clock Buffer | Texas Instruments
MPN: CDCDB803ERSLR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for CDCDB803ERSLR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
CDCDB803ERSLT
β Drop-Inπ Reference alternative (not in catalog)
CDCDB803EVM
β Drop-Inπ Reference alternative (not in catalog)
9DB803
β Drop-Inπ Reference alternative (not in catalog)
9DB803AGLF
β Drop-Inπ Reference alternative (not in catalog)
PI6C557-03B
β Drop-Inπ Reference alternative (not in catalog)
CDCDB803ERSLR Maximum Ratings & Electrical Characteristics
| Type | Clock Buffer |
| Number of Outputs | 8 |
| Input:Output Ratio | 1:8 |
| Maximum Frequency | 250 MHz |
| Output Logic | LP-HCSL |
| Input Logic | HCSL |
| Supply Voltage | 3.3 V |
| Package | 48-VFQFN (6x6 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Interface | SMBus |
| Output Enable | 8 individual pins |
| Compliance | DB800ZL, DB2000Q |
| RoHS | Compliant |
| Applications | PCIe Gen 1-6, QPI, UPI, SAS, SATA |
CDCDB803ERSLR Pin Configuration
| Pin 1 | OUT0 β Output 0 |
| Pin 2 | OUT0# β Complementary output 0 |
| Pin 3 | VDD β Power supply |
| Pin 4 | GND β Ground |
| Pin 5 | OUT1 β Output 1 |
| Pin 6 | OUT1# β Complementary output 1 |
| Pin 7 | VDD β Power supply |
| Pin 8 | GND β Ground |
| Pin 9 | OUT2 β Output 2 |
| Pin 10 | OUT2# β Complementary output 2 |
| Pin 11 | VDD β Power supply |
| Pin 12 | GND β Ground |
| Pin 13 | OUT3 β Output 3 |
| Pin 14 | OUT3# β Complementary output 3 |
| Pin 15 | VDD β Power supply |
| Pin 16 | GND β Ground |
| Pin 17 | OUT4 β Output 4 |
| Pin 18 | OUT4# β Complementary output 4 |
| Pin 19 | VDD β Power supply |
| Pin 20 | GND β Ground |
| Pin 21 | OUT5 β Output 5 |
| Pin 22 | OUT5# β Complementary output 5 |
| Pin 23 | VDD β Power supply |
| Pin 24 | GND β Ground |
| Pin 25 | OUT6 β Output 6 |
| Pin 26 | OUT6# β Complementary output 6 |
| Pin 27 | VDD β Power supply |
| Pin 28 | GND β Ground |
| Pin 29 | OUT7 β Output 7 |
| Pin 30 | OUT7# β Complementary output 7 |
| Pin 31 | VDD β Power supply |
| Pin 32 | GND β Ground |
| Pin 33 | SMB_CLK β SMBus clock |
| Pin 34 | SMB_DAT β SMBus data |
| Pin 35 | OE0 β Output enable 0 |
| Pin 36 | OE1 β Output enable 1 |
| Pin 37 | OE2 β Output enable 2 |
| Pin 38 | OE3 β Output enable 3 |
| Pin 39 | OE4 β Output enable 4 |
| Pin 40 | OE5 β Output enable 5 |
| Pin 41 | OE6 β Output enable 6 |
| Pin 42 | OE7 β Output enable 7 |
| Pin 43 | CLKIN β Input clock |
| Pin 44 | CLKIN# β Complementary input clock |
| Pin 45 | VDD β Power supply |
| Pin 46 | GND β Ground |
| Pin 47 | NC β No connect |
| Pin 48 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
CDCDB803ERSLR is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for CDCDB803ERSLR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- DB800ZL and DB2000Q compliance (vs PI6C557-03B)
- SMBus interface and individual output enables (vs PI6C557-03B)
- Support for PCIe Gen 6 (vs 9DB803)
Design Notes
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.
Compliance Information
RoHS compliant per JLCPCB. Other compliance data not specified in provided sources.
