NXP Semiconductors CBTL04DP211BS,518

Overview

CBTL04DP211BS,518 from NXP Semiconductors is a DisplayPort 2:1 multiplexer IC for PC motherboard and docking station applications requiring flexible routing of 2-lane DisplayPort v1.1a/v1.2 Main Link, AUX, and HPD signals. It supports 1.62 Gbit/s and 2.7 Gbit/s data rates, delivers <5 ps intra-pair skew, and operates from a single 3.3 V supply with only 200 µA typical supply current.

For engineers reviewing the CBTL04DP211BS,518 datasheet, CBTL04DP211BS,518 pinout, CBTL04DP211BS,518 application, or CBTL04DP211BS,518 equivalent, this page provides verified functional topology, validated HVQFN32 pin mapping, confirmed 2-lane DP switching/multiplexing capability, and real-world selection logic behavior for GPU_SEL and AUX_SEL control inputs.

Technical Context

The CBTL04DP211BS,518 implements non-directional, high-bandwidth analog pass-gate switching across two independent signal domains: GPU_SEL controls 2×2-lane Main Link differential pairs plus HPD, while AUX_SEL independently selects between two AUX differential channels. No clock or reset is required - operation is purely level-sensitive CMOS control.

All signal paths maintain tight timing integrity: inter-pair skew is <180 ps, bandwidth exceeds 2.0 GHz (−3 dB), and differential insertion loss is −2.7 dB at 1.5 GHz. The device supports bidirectional signal flow, enabling both source-to-sink (1→2) and sink-to-source (2→1) topologies without reconfiguration.

Key Specifications

Pinout & Package

HVQFN32 package (SOT1185-1), 3 mm × 6 mm × 0.85 mm body, 0.4 mm pitch, 32 terminals, thermally enhanced with exposed center ground pad. Requires soldering of center pad to PCB thermal plane with thermal vias per NXP layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DisplayPort multiplexing applications.

Compared with TPD4S012 and PI3DBS16412, CBTL04DP211BS,518 uniquely balances 2-lane DP bandwidth, independent AUX routing, ultra-low skew, and sub-mA power - making it optimal for space-constrained, dual-GPU motherboard and docking designs where timing integrity and control flexibility are critical.

Availability

CBTL04DP211BS,518 is available at Aetrix Electronics and suitable for desktop motherboards, docking stations, and notebook eDP routing applications requiring stable component supply, long-term industrial temperature support (−40 °C to +85 °C), and guaranteed traceable sourcing.

Supply support for CBTL04DP211BS,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 consumer electronics.

The CBTL04DP211BS,518 belongs to NXP's DisplayPort interface product line, designed specifically for high-fidelity, low-latency video signal routing in PC platforms where GPU flexibility, signal integrity, and power efficiency are essential.

FAQ

What is the primary function of the CBTL04DP211BS,518 in a DisplayPort system?

The CBTL04DP211BS,518 is a 2:1 DisplayPort multiplexer that routes two 2-lane Main Link sources (e.g., CPU and GPU) to a single DisplayPort sink, while independently switching AUX and HPD signals. Its pass-gate architecture supports bidirectional operation, enabling both source-selection and sink-selection topologies without external clocks or configuration registers. This makes CBTL04DP211BS,518 ideal for dynamic GPU switching in modern PC platforms.

Does the CBTL04DP211BS,518 support DisplayPort v1.2 embedded DisplayPort (eDP) applications?

Yes, the CBTL04DP211BS,518 explicitly supports Embedded DisplayPort v1.2 at 1.62 Gbit/s and 2.7 Gbit/s data rates, as confirmed in its official product data sheet. It maintains full electrical compliance including differential skew (<5 ps intra-pair), bandwidth (>2.0 GHz), and insertion loss (−2.7 dB @ 1.5 GHz), making CBTL04DP211BS,518 suitable for notebook internal display routing where eDP PHY resources must be shared between internal and external displays.

How does the GPU_SEL pin interact with HPD and AUX signals in the CBTL04DP211BS,518?

In the CBTL04DP211BS,518, GPU_SEL controls only the Main Link differential pairs (IN1/IN2 → OUT_0/OUT_1) and the HPD signal path (HPD_1/HPD_2 → HPD_IN). AUX routing is fully independent and governed solely by the AUX_SEL pin. This separation ensures that AUX channel negotiation (e.g., EDID reads or DPCD writes) remains uninterrupted during GPU source transitions - a key requirement validated in CBTL04DP211BS,518's functional description and Table 3–5.

What is the recommended PCB layout practice for the exposed thermal pad on the CBTL04DP211BS,518 HVQFN32 package?

The exposed center pad of the CBTL04DP211BS,518 must be soldered to a solid PCB ground plane using a thermal pad with ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) connecting to inner ground layers. Per NXP SOT1185-1 guidelines, this pad is electrically tied to GND and is essential for thermal dissipation, signal reference stability, and ESD performance. Failure to connect the pad results in degraded skew, increased supply noise, and potential ESD failure - all documented in CBTL04DP211BS,518's Package Outline and Functional Description sections.

Can the CBTL04DP211BS,518 be used in reverse topology - i.e., one DisplayPort source to two sinks?

Yes, the CBTL04DP211BS,518 supports reverse topology due to its non-directional pass-gate architecture. When configured with OUT_0+/OUT_0− as the input and IN1/IN2 as outputs, CBTL04DP211BS,518 functions as a 1:2 DisplayPort switch - routing one source to either of two sinks. This is explicitly stated in the General Description and validated in Figure 3 (Application Diagram), where GPU A and GPU B are shown as selectable sources, confirming bidirectional capability without signal degradation.