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NXP Semiconductors CBTU0808EE/G,518
- Part No.:
- CBTU0808EE/G,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 48-TFBGA
- Datasheet:
-
CBTU0808EE/G,518.pdf
- Description:
- IC INTFACE SPECIALIZED 48TFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
CBTU0808EE/G,518 from NXP Semiconductors is a dual-lane PCI Express port multiplexer IC designed for high-speed signal path switching in PCIe Gen 1 systems. It supports two independent lanes, each with transmit/receive differential channels and four ports (A/B source and A/B destination), operates from a single 1.8 V supply, delivers >1 GHz bandwidth, and provides <−35 dB off-isolation and crosstalk at 1.25 GHz-enabling reliable docking and port-switching in server backplanes.
For engineers reviewing the CBTU0808EE/G,518 datasheet, CBTU0808EE/G,518 pinout, CBTU0808EE/G,518 application, or CBTU0808EE/G,518 equivalent, this page delivers verified pin mapping, PCIe-compliant dynamic performance metrics, lane-specific CMOS control logic (CTRL0/CTRL1), TFBGA48 package routing guidance, and validated alternative options for PCIe Gen 1 signal routing designs.
Technical Context
The CBTU0808EE/G,518 implements three deterministic switch configurations per lane-dual-through (SA↔DA, SB↔DB), single-cross (SA↔DB), or full disconnect-each applied identically to Tx and Rx differential pairs within the same lane. Control is managed via dedicated CMOS inputs CTRL0 (lane 0) and CTRL1 (lane 1), with TEST0 enabling global port isolation for test mode.
Its switch architecture is optimized for PCIe signaling integrity: on-state resistance is 8–12 Ω with <0.75 Ω variation across input voltage, ON-capacitance is 3.6–4.75 pF (silicon-only), and differential skew is ≤5 ps-ensuring sub-100 ps propagation delay (typ. 60 ps) and <40 ps output/edge skew for timing-critical PCIe interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.7–1.9 V - Enables direct interface with 1.8 V PCIe root complex and endpoint I/O domains without level translation. |
| Bandwidth | >1 GHz - Supports full PCIe Gen 1 data rate (2.5 GT/s) with adequate margin for channel loss and jitter. |
| Off-Isolation / Crosstalk | <−35 dB at 1.25 GHz - Prevents signal leakage between active and inactive ports during switching, critical for multi-device PCIe topologies. |
| Insertion Loss | −3.3 dB max at ≤1.25 GHz - Minimizes amplitude degradation across switched paths, preserving eye opening at receiver. |
| Propagation Delay | Typ. 60 ps - Ensures sub-nanosecond latency for real-time port reconfiguration in hot-plug scenarios. |
| ESD Rating | 8 kV HBM - Provides robust handling tolerance during board assembly and system integration. |
| Package | TFBGA48, 5 × 5 × 0.8 mm, 0.5 mm pitch - Enables dense routing with standard PCB fabrication; depopulated 9×9 grid reduces ball count while maintaining escape capability. |
Pinout & Package
CBTU0808EE/G,518 is housed in a Pb-free, green-compatible TFBGA48 package (SOT918-1) with 48 solder balls arranged in a depopulated 9×9 grid, 5 mm × 5 mm body size, and 0.8 mm height-designed for reflow soldering and compatible with conventional PCB trace routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL0 (A1) | Lane 0 configuration control | CMOS input selecting SA↔DA/SB↔DB, SA↔DB, or disconnect for both Tx0/Rx0 differential pairs simultaneously. |
| CTRL1 (J9) | Lane 1 configuration control | CMOS input selecting identical switch states for Tx1/Rx1-enables independent lane routing without cross-talk coupling. |
| TXSA0P/N (A4/B4, A2/B3) | Lane 0 source transmit differential pair A | Direct connection to PCIe root complex or switch upstream Tx outputs; impedance-matched to 100 Ω differential. |
| RXDA0P/N (B9/C8, D9/D8) | Lane 0 destination receive differential pair A | Feeds PCIe endpoint device Rx inputs; maintains signal integrity through low-skew, low-loss switched path. |
| VDD (B5, E2, E8, H5) | Power supply | Four distributed 1.8 V supply pins minimize IR drop and improve PSRR for high-frequency switching noise rejection. |
| GND (A5, B2, B8, E1, E9, H2, H8, J5) | Ground reference | Eight ground balls provide low-inductance return paths essential for PCIe common-mode noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-lane PCIe port multiplexing | Independent control of two full PCIe lanes (Tx/Rx per lane), enabling simultaneous switching of host-to-device paths without inter-lane interference. |
| PCIe Gen 1 compliance | Validated insertion loss (≤−3.3 dB), return loss (≥−6 dB), and crosstalk (<−35 dB) up to 1.25 GHz meet PCIe Base Spec 1.1 electrical requirements. |
| Impedance-matched switching | On-impedance and layout co-designed to match 100 Ω differential PCIe environment-reducing reflections and improving eye diagram quality. |
| Low differential skew | ≤5 ps skew between P/N members of any differential pair preserves signal timing margins and minimizes jitter accumulation. |
| Test-mode isolation | TEST0 input forces all ports into high-Z state-enabling in-system functional verification without signal injection or external load changes. |
Applications
| PCIe Docking Station | Server Backplane Switching |
|---|---|
|
Use Scenario: A laptop docks into a desktop-style expansion chassis supporting multiple PCIe peripherals (GPU, NVMe, NIC). IC Role / Device Role / Timing Role: CBTU0808EE/G,518 routes the laptop's PCIe x2 link to alternate downstream devices based on physical dock engagement and firmware negotiation. Use Value: Enables seamless peripheral reassignment without BIOS reboot or OS driver reload-leveraging deterministic <100 µs reconfiguration time and Gen 1 signal fidelity. |
Use Scenario: A modular server blade connects to a midplane with multiple fabric links; PCIe lanes must be dynamically assigned to different I/O modules. IC Role / Device Role / Timing Role: CBTU0808EE/G,518 acts as a non-blocking 2×2 lane selector per slot, controlled by baseboard management controller (BMC) GPIOs. Use Value: Supports field-upgradable I/O configurations using existing backplane wiring-eliminating need for fixed trace routing or FPGA-based switching logic. |
| Embedded PCIe Hot-Swap | PCIe Test Fixture Multiplexing |
|
Use Scenario: Industrial controller with hot-swappable PCIe mezzanine cards requires lane-level failover when a card is inserted or removed. IC Role / Device Role / Timing Role: CBTU0808EE/G,518 isolates faulty or unpowered cards while rerouting active lanes to redundant paths under PLX/PCIe switch supervision. Use Value: Maintains system uptime during maintenance-achievable due to <−35 dB off-isolation preventing signal corruption during transition states. |
Use Scenario: Automated test equipment validates PCIe signal integrity across multiple DUTs using shared protocol analyzer and pattern generator resources. IC Role / Device Role / Timing Role: CBTU0808EE/G,518 switches analyzer probes between DUT lanes under software control, minimizing cable movement and contact wear. Use Value: Reduces test cycle time by 40% versus manual reconnection-enabled by 100 µs reconfiguration time and guaranteed sub-ns skew stability across switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe Gen 1 port multiplexing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PI3CH422LE | Single-lane, 4-channel analog switch; 3.3 V operation; no integrated PCIe impedance matching or Gen 1 validation. | Suitable only for low-speed PCIe enumeration or sideband signal routing-not for active data lane switching. | Select only if routing non-critical control signals (e.g., PERST#, WAKE#) alongside PCIe lanes, not replacing CBTU0808EE/G,518 for high-speed path selection. |
| TS3L110PWR | Single-supply 3.3 V LVCMOS switch; 500 MHz bandwidth; no PCIe-specific characterization or differential pair support. | Limited to legacy PCI or low-frequency muxing; lacks differential termination, skew control, or Gen 1 compliance testing. | Use only in cost-sensitive, non-PCIe applications where bandwidth and signal integrity requirements are relaxed below 500 MHz. |
Compared with PI3CH422LE and TS3L110PWR, the CBTU0808EE/G,518 uniquely delivers dual-lane, PCIe Gen 1–validated switching with matched differential impedance, sub-5 ps differential skew, and integrated test-mode isolation-making it the sole option for production-grade PCIe docking, backplane, and hot-swap systems requiring Gen 1 signal integrity.
Availability
CBTU0808EE/G,518 is available at Aetrix Electronics and suitable for PCIe docking stations, server backplane switching, embedded hot-swap controllers, and automated test fixtures requiring stable component supply and long-term lifecycle support.
Supply support for CBTU0808EE/G,518 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communication infrastructure markets.
The CBTU0808EE/G,518 belongs to NXP's high-speed interface portfolio, developed specifically to enable flexible, standards-compliant PCIe Gen 1 signal routing in space-constrained computing platforms such as thin-client docking systems and modular servers.
FAQ
What is the maximum operating frequency supported by the CBTU0808EE/G,518?
The CBTU0808EE/G,518 supports differential signaling up to 1.25 GHz with validated performance-including −3.3 dB insertion loss and <−35 dB crosstalk-making it fully compliant with PCIe Gen 1 (2.5 GT/s) data rates. Its >1 GHz bandwidth ensures sufficient margin for channel loss compensation and jitter tolerance in real-world PCB layouts.
Does the CBTU0808EE/G,518 require external termination resistors for PCIe differential pairs?
No. The CBTU0808EE/G,518 is internally designed to match the 100 Ω differential impedance of PCIe signaling environments. External termination is not required at the switch itself; however, proper 100 Ω differential routing and endpoint termination (per PCIe spec) must still be implemented on the PCB.
How does the TEST0 pin function in normal operation of the CBTU0808EE/G,518?
In normal operation, TEST0 should be left open-circuited. An internal pull-down resistor holds it LOW, disabling test mode and allowing CTRL0/CTRL1 to control lane switching. Only during factory test or debug should TEST0 be driven HIGH to force all ports into high-Z isolation-this is not intended for runtime use.
Can the CBTU0808EE/G,518 be used with PCIe Gen 2 or higher data rates?
No. The CBTU0808EE/G,518 was characterized and validated exclusively for PCIe Gen 1 (2.5 GT/s). Its −3.3 dB insertion loss at 1.25 GHz and lack of Gen 2–specific compliance testing mean it does not meet the stricter signal integrity requirements of Gen 2 (5 GT/s) or later generations.
What is the power consumption of the CBTU0808EE/G,518 during active switching?
The CBTU0808EE/G,518 draws a typical supply current of 1 mA under recommended operating conditions (1.7–1.9 V, 0–85 °C ambient). This static current remains constant regardless of switch configuration or signal activity-no additional dynamic power is consumed during lane reconfiguration.
CBTU0808EE/G,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-TFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Computer Port Switching and Docking
- Interface:
- CMOS
- Voltage - Supply:
- 1.7V ~ 1.9V
- Supplier Device Package:
- 48-TFBGA (5x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
CBTU0808EE/G,518 FAQ
1.How can I place an order for CBTU0808EE/G,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBTU0808EE/G,518 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 CBTU0808EE/G,518 reliable?
The price and inventory of CBTU0808EE/G,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBTU0808EE/G,518 is usually 5 days.
3.What payment methods are accepted for CBTU0808EE/G,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBTU0808EE/G,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBTU0808EE/G,518?
CBTU0808EE/G,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBTU0808EE/G,518 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 CBTU0808EE/G,518?
For technical support, including CBTU0808EE/G,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBTU0808EE/G,518 requirements.
6.How does Aetrix verify that CBTU0808EE/G,518 is sourced from the original manufacturer or authorized distributors?
All CBTU0808EE/G,518 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 CBTU0808EE/G,518 meets industry standards.
7.What is the process for return or replacement of CBTU0808EE/G,518?
All CBTU0808EE/G,518 units undergo pre-shipment inspection (PSI). If there is an issue with CBTU0808EE/G,518, 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 CBTU0808EE/G,518 part is unused and in its original packaging.
Return procedure for CBTU0808EE/G,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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