Part A
9DBL0452BKILFT
Renesas Electronics Corporation
- Lifecycle
- Active
- Stock
- 1308 Stückzahl
- Series
- Clock-Timing und anwendungsspezifische Clock-Timing
Replacement verdict
Compatible functional replacement candidate
The 9DBL0452BKILFT and 9DBL0255NLGI are both 3.3V zero-delay clock buffers from Renesas with HCSL-compatible differential outputs, making the 9DBL0255NLGI a viable functional replacement candidate for the 9DBL0452BKILFT in clock distribution applications. However, designers must validate output enable polarity, package footprint, and input termination requirements before committing to a drop-in substitution.
Output Type
High match
Supply Voltage
High match
Package Type
Validation required
Output Enable Logic
Validation required
Parts at a glance
Part B
9DBL0255NLGI
Renesas Electronics America Inc.
- Lifecycle
- Active
- Stock
- 7785 Stückzahl
- Package
- VFQFN-16
- Series
- Takt- und anwendungsspezifisch
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 9DBL0452BKILFT | 9DBL0255NLGI | Why it matters |
|---|---|---|---|
| Manufacturer | Renesas Electronics | Renesas Electronics | Same manufacturer ensures consistent quality and support ecosystem. |
| Function | Zero-delay buffer / clock fanout buffer | Clock generator / fanout buffer | Defines the core role in the clock tree; different functions may not be drop-in substitutes. |
| Output Type | Differential (HCSL/LP-HCSL) | Differential (HCSL) | Output signaling must match downstream receiver requirements for compatibility. |
| Number of Outputs | 4 | 2 | Output count determines how many loads can be driven without additional buffering. |
| Input Frequency Range | Up to 200 MHz | Up to 200 MHz | Must cover the system reference clock frequency for proper operation. |
| Supply Voltage | 3.3 V | 3.3 V | Supply rail must match the board power design to avoid level shifting or damage. |
| Package | TSSOP / QSOP | QFN | Footprint and thermal characteristics affect PCB layout and assembly compatibility. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Must meet the environmental conditions of the target application. |
| Additive Jitter | Low (typical <1 ps RMS) | Low (typical <1 ps RMS) | Jitter directly impacts signal integrity and timing margins in high-speed interfaces. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 9DBL0452BKILFT | 9DBL0255NLGI |
|---|---|---|
| Supplier | - | Renesas Electronics America Inc |
| Part Status | Obsolete | Active |
| PLL | Yes | Yes with Bypass |
| Main Purpose | PCI Express (PCIe) | PCI Express (PCIe) |
| Input | HCSL | Clock |
| Output | HCSL | LP-HCSL |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:4 | 1:2 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 200MHz | 220MHz |
| Voltage - Supply | 3.135V ~ 3.465V | 3.135V ~ 3.465V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | 9DBL0452 | - |
| Digi Key Programmable | Not Verified | - |
| Packaging | Tape & Reel (TR) | - |
Frequently asked questions
What are the primary differences between the 9DBL0452BKILFT and the 9DBL0255NLGI?
The 9DBL0452BKILFT is a 4-output differential clock buffer from Renesas designed for PCIe Gen1–Gen5 applications, while the 9DBL0255NLGI is a 2-output differential clock buffer from Renesas targeting similar PCIe clock distribution requirements. The 9DBL0452BKILFT provides four differential outputs, whereas the 9DBL0255NLGI provides two differential outputs, making output count the most significant functional difference between the two devices.
Do the 9DBL0452BKILFT and 9DBL0255NLGI support the same output signaling type?
Both devices provide differential clock outputs intended for PCIe clock distribution. The 9DBL0452BKILFT and 9DBL0255NLGI are members of Renesas' 9DBL series of differential clock buffers, and both are specified for use in PCIe clock tree applications. Designers should confirm the exact output format and termination requirements in the respective Renesas datasheets before layout.
Can the 9DBL0452BKILFT and 9DBL0255NLGI be used interchangeably in the same socket?
No. The 9DBL0452BKILFT and 9DBL0255NLGI differ in output count and package type, so they are not pin-to-pin or functionally interchangeable without design changes. The 9DBL0452BKILFT is offered in a 32-pin VFQFPN package, while the 9DBL0255NLGI is offered in a 32-pin VFQFPN package as well, but the output configuration and internal function differ, so a direct drop-in substitution is not supported.
How many differential outputs does each device provide?
The 9DBL0452BKILFT provides four differential clock outputs. The 9DBL0255NLGI provides two differential clock outputs. This difference directly affects how many PCIe endpoints or clock-consuming devices each buffer can drive in a system clock tree.
Are the 9DBL0452BKILFT and 9DBL0255NLGI both suitable for PCIe clock distribution?
Yes. Both the 9DBL0452BKILFT and 9DBL0255NLGI are Renesas differential clock buffers intended for PCIe clock distribution. The 9DBL0452BKILFT is commonly associated with PCIe Gen1 through Gen5 clock buffering, and the 9DBL0255NLGI is also a PCIe-oriented differential buffer. The appropriate choice depends on the required number of outputs and the specific PCIe generation requirements of the design.
What package types are used for the 9DBL0452BKILFT and 9DBL0255NLGI?
The 9DBL0452BKILFT is supplied in a 32-pin VFQFPN package. The 9DBL0255NLGI is also supplied in a 32-pin VFQFPN package. Although the package family and pin count are the same, the internal output configuration and device function differ, so PCB designers must verify pin assignments and land patterns against the correct datasheet for each part number.
Which device should be selected for a design requiring four PCIe differential clock outputs?
The 9DBL0452BKILFT should be selected when four differential PCIe clock outputs are required, because it is specified as a 4-output differential clock buffer. The 9DBL0255NLGI provides only two differential outputs and would not meet a four-output requirement without additional buffering. Final selection should always be validated against the latest Renesas datasheet and the target PCIe generation requirements.